CKNY

Have you ever seem the movie "Matrix"?? I want to use the same way to control the camera so it can keep surrounding an object. However I don't know what I did wrong. This is supposed to be very simple.....but camera just couldn't listen to me.

In the jit.gl.render, I use "ortho 0", my object position is "0. 0. 0.". I use "pak camera 0. 0. 4." and try to adjust the numbers of camera. What I should do if I want to surround the object. I thought I only need to adjust y but the result is not what I want. The object just fly away from camera. What should I do to make a beautiful circle around the object?

control-camera

Quote: CKNY wrote on Mon, 27 August 2007 17:31

----------------------------------------------------

> Have you ever seem the movie "Matrix"?? I want to use the same way to control the camera so it can keep surrounding an object. However I don't know what I did wrong. This is supposed to be very simple.....but camera just couldn't listen to me.

> In the jit.gl.render, I use "ortho 0", my object position is "0. 0. 0.". I use "pak camera 0. 0. 4." and try to adjust the numbers of camera. What I should do if I want to surround the object. I thought I only need to adjust y but the result is not what I want. The object just fly away from camera. What should I do to make a beautiful circle around the object?

Sorry I want to make up something here. The reason I want to use camera to circle the object is I will need to create more shaders if possible. Each shader will have different positions. So I can not only rotate the shaders. I need to use camera to circle around those shaders. So if I have 3 different objects in 3 different positions, I hope I still can use camera to make what people called "arc" around those objects based in the center 0. 0. 0. Please tell me how to do it.

Quote: CKNY wrote on Mon, 27 August 2007 17:31
----------------------------------------------------
> Hi,
>
> Have you ever seem the movie "Matrix"?? I want to use the same way to control the camera so it can keep surrounding an object. However I don't know what I did wrong. This is supposed to be very simple.....but camera just couldn't listen to me.
>
> In the jit.gl.render, I use "ortho 0", my object position is "0. 0. 0.". I use "pak camera 0. 0. 4." and try to adjust the numbers of camera. What I should do if I want to surround the object. I thought I only need to adjust y but the result is not what I want. The object just fly away from camera. What should I do to make a beautiful circle around the object?
>
> thank you so much
----------------------------------------------------

Sorry I want to make up something here. The reason I want to use camera to circle the object is I will need to create more shaders if possible. Each shader will have different positions. So I can not only rotate the shaders. I need to use camera to circle around those shaders. So if I have 3 different objects in 3 different positions, I hope I still can use camera to make what people called "arc" around those objects based in the center 0. 0. 0.   Please tell me how to do it.

i posted a similar question a few months back but never got a reply... i got as far as andrew's solution, but i was trying to implement a "spherical" orbit where the Y axis is also part of the equation (like a satellite) that's where my (basic) trigononmetry skills fell apart, any ideas?

http://en.wikipedia.org/wiki/Spherical_trigonometry

Quote: andrewb@cycling74.com wrote on Mon, 27 August 2007 17:52

> Sounds like a job for polar coordinates:

> #P flonum 181 170 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P newex 235 118 224 196617 jit.gl.gridshape foo @shape cube @scale 0.5 

> 0.5 0.15 @lighting_enable 1 @position 0.9 0.1 0.7;

> #P newex 150 228 81 196617 prepend camera;

> #P newex 150 207 66 196617 pack 0. 0. 0.;

> #P flonum 187 137 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 150 137 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 150 33 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 170 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P newex 41 252 147 196617 jit.window foo @depthbuffer 1;

> #P newex 232 95 339 196617 jit.gl.gridshape foo @shape torus @scale 0.5 

> #P newex 40 174 82 196617 jit.gl.render foo;

Hey thanks, that's exactly what I want. One thing I wandering is that is it possible to change the center point and do the arc of camera? I mean, if I want to change the center point from (0,0,0) to (0,9,5) or (10,8,4), what should I fix with this patch? Just in case I need to do this way......

again, thanks for the patch, actually I didn't know "poltocar" before. This is a very useful object.

Quote: andrewb@cycling74.com wrote on Mon, 27 August 2007 17:52
----------------------------------------------------
> Sounds like a job for polar coordinates:
>
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P comment 207 57 100 196617 angle;
> #P newex 159 170 20 196617 t b;
> #P flonum 181 170 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window linecount 2;
> #P newex 235 118 224 196617 jit.gl.gridshape foo @shape cube @scale 0.5 
> 0.5 0.15 @lighting_enable 1 @position 0.9 0.1 0.7;
> #P window linecount 1;
> #P newex 150 228 81 196617 prepend camera;
> #P newex 150 207 66 196617 pack 0. 0. 0.;
> #P flonum 187 137 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 150 137 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 150 33 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 170 73 29 196617 t b f;
> #P flonum 170 55 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 150 103 47 196617 poltocar;
> #P newex 41 252 147 196617 jit.window foo @depthbuffer 1;
> #P newex 232 95 339 196617 jit.gl.gridshape foo @shape torus @scale 0.5 
> 0.5 0.55 @lighting_enable 1;
> #P toggle 40 31 15 0;
> #P newex 40 90 50 196617 t b erase;
> #P newex 40 174 82 196617 jit.gl.render foo;
> #P newex 40 63 51 196617 qmetro 5;
> #P comment 189 30 100 196617 distance;
> #P connect 16 0 17 0;
> #P connect 16 0 13 1;
> #P connect 17 0 13 0;
> #P connect 8 0 9 0;
> #P connect 9 1 7 1;
> #P connect 9 0 7 0;
> #P connect 10 0 7 0;
> #P connect 7 0 11 0;
> #P connect 7 1 12 0;
> #P connect 14 0 2 0;
> #P connect 13 0 14 0;
> #P connect 12 0 13 2;
> #P connect 11 0 13 0;
> #P connect 4 0 1 0;
> #P fasten 3 1 2 0 85 113 45 113;
> #P connect 3 0 2 0;
> #P connect 1 0 3 0;
> #P window clipboard copycount 19;
>
>
----------------------------------------------------

Here's a patch that allows for spherical rotation. You can rotate around the y axis (as in Andrew's patch), and you can rotate around the x or z axes (depending on where you are). Check it out.

One correction with changing the amplitude. Here's the correct patch.

nice patch zachary, that's exactly what i was trying to do... but i was getting stuck with the 3d relationships between each axis. i also like the up vector part, so you get a choice of how it responds.

in terms of changing the central point of the sphere (or orbit), i'm assuming all you need to do is add the values (new centre coords) to the output of the equation, before it goes to [pack camera 0. 0. 0.].

Thanks Justin, this trig reviewing that I've been doing seems to be paying off.

You need to alter the lookat coordinate AND add those values to the camera coordinates. Here's the patch with that addition.

Thanks Justin, this trig reviewing that I've been doing seems to be paying off. 

You need to alter the lookat coordinate AND add those values to the camera coordinates. Here's the patch with that addition. 

Quote: Zachary Seldess wrote on Wed, 29 August 2007 14:26

> Thanks Justin, this trig reviewing that I've been doing seems to be paying off. 

> You need to alter the lookat coordinate AND add those values to the camera coordinates. Here's the patch with that addition. 

well now i feel like i'm still novice in the trig domain!

and of course the lookat coords... makes perfect sense (need coffee)! will have to check out that other patch of yours (the 3d nav)....

Quote: Zachary Seldess wrote on Wed, 29 August 2007 14:26
----------------------------------------------------
> Thanks Justin, this trig reviewing that I've been doing seems to be paying off. 
>
> You need to alter the lookat coordinate AND add those values to the camera coordinates. Here's the patch with that addition. 
----------------------------------------------------

Quote: Zachary Seldess wrote on Wed, 29 August 2007 07:26

> #P comment 72 224 121 196617 adjust center of rotation;

> #P flonum 111 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P flonum 153 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P flonum 69 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P newex 27 345 138 196617 pak lookat 0. 0. 0.;

> #P newex 10 531 618 196617 jit.gl.gridshape sphere_rotate @shape cube @scale 10. 10. 10. @poly_mode 1 1 @lighting_enable 1 @depth_enable 1 @color 1. 1. 0. 1.;

> #P comment 390 94 317 196617 choose y-rotation behavior ; 1 is like doing flips around the ball ; 2 will keep your view oriented so your up is always "above" you ;;

> #P hidden newex 498 164 24 196617 t 1.;

> #P hidden newex 471 164 24 196617 t 0.;

> #P newex 431 208 331 196617 if ($f1 > 1.2 && $f1 < 1.7) || ($f1 > 4.4 && $f1 < 5.) then 0.02 else 0.;

> #P comment 249 85 106 196617 change amplitude (distance from object);

> #P flonum 249 111 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P newex 390 228 240 196617 if $f1 < 1.570796 || $f1 > 4.71239 then 1. else -1.;

> #P comment 396 256 48 1310730 up vector;

> #P window setfont "Fixedwidth Serif" 9.;

> #P flonum 431 286 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 390 286 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;

First of all. Your patch is soooo cool and really gave me so much fun. Thanks a lot!! Here I have one thought.............what if I want to set the camera in position 0. 0. 0. and only "look around" it? like stand in one position and looking around? I used "lookat 0. 0. 0." but I couldn't make camera really like "look around". Do you know how to do it?

Quote: Zachary Seldess wrote on Wed, 29 August 2007 07:26
----------------------------------------------------
> Thanks Justin, this trig reviewing that I've been doing seems to be paying off. 
>
> You need to alter the lookat coordinate AND add those values to the camera coordinates. Here's the patch with that addition. 
>
> max v2;
> #N vpatcher 439 100 1228 672;
> #P origin 0 -13;
> #P window setfont Geneva 9.;
> #P window linecount 1;
> #P newex 153 280 40 196617 t f b f;
> #P newex 111 280 40 196617 t f b f;
> #P newex 69 280 40 196617 t f b f;
> #P comment 72 224 121 196617 adjust center of rotation;
> #P comment 164 243 14 196617 z;
> #P comment 82 243 14 196617 x;
> #P flonum 111 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 153 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 69 259 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P comment 119 243 14 196617 y;
> #P newex 291 322 27 196617 + 0.;
> #P newex 251 322 27 196617 + 0.;
> #P newex 211 322 27 196617 + 0.;
> #P newex 27 345 138 196617 pak lookat 0. 0. 0.;
> #P newex 10 531 618 196617 jit.gl.gridshape sphere_rotate @shape cube @scale 10. 10. 10. @poly_mode 1 1 @lighting_enable 1 @depth_enable 1 @color 1. 1. 0. 1.;
> #P newex 249 131 53 196617 t b b f f;
> #P window linecount 3;
> #P comment 390 94 317 196617 choose y-rotation behavior ; 1 is like doing flips around the ball ; 2 will keep your view oriented so your up is always "above" you ;;
> #P window linecount 1;
> #P hidden newex 498 164 24 196617 t 1.;
> #P hidden newex 471 164 24 196617 t 0.;
> #P message 406 134 14 196617 2;
> #P message 390 134 14 196617 1;
> #P newex 390 186 51 196617 gate 2 1;
> #P newex 431 164 37 196617 abs 0.;
> #P newex 431 208 331 196617 if ($f1 > 1.2 && $f1 < 1.7) || ($f1 > 4.4 && $f1 < 5.) then 0.02 else 0.;
> #P window linecount 2;
> #P comment 249 85 106 196617 change amplitude (distance from object);
> #P flonum 249 111 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P window linecount 1;
> #P newex 390 228 240 196617 if $f1 < 1.570796 || $f1 > 4.71239 then 1. else -1.;
> #P window setfont Times 10.;
> #P comment 396 256 48 1310730 up vector;
> #P comment 447 270 39 1310730 z;
> #P comment 405 270 39 1310730 y;
> #P comment 362 270 39 1310730 x;
> #P window setfont "Fixedwidth Serif" 9.;
> #P flonum 431 286 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 390 286 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 349 286 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window setfont "Fixedwidth Serif" 10.;
> #P newex 308 345 133 1441802 pak up 0. 1. 0.;
> #P window setfont Geneva 9.;
> #P flonum 169 34 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P newex 10 508 468 196617 jit.gl.gridshape sphere_rotate @shape cube @scale 1.5 0.05 0.5 @lighting_enable 1 @depth_enable 1;
> #P newex 171 345 131 196617 pak camera 0. 0. 0.;
> #P newex 10 486 450 196617 jit.gl.gridshape sphere_rotate @shape sphere @scale 1. 1. 1. @lighting_enable 1 @depth_enable 1;
> #P toggle 203 371 15 0;
> #P newex 203 416 50 196617 t b erase;
> #P newex 203 394 52 196617 metro 20;
> #P newex 203 443 363 196617 jit.gl.render sphere_rotate @erase_color 0. 0. 0. 1 @axes 1 @camera 4. 0. 0.;
> #P newex 10 465 197 196617 jit.window sphere_rotate @depthbuffer 1;
> #P comment 268 184 112 196617 rotation around y axis;
> #P comment 207 35 123 196617 rotation around x/z axes;
> #P comment 302 265 14 196617 z;
> #P comment 224 265 14 196617 x;
> #P newex 229 205 29 196617 t b f;
> #P flonum 251 281 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 291 281 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 211 281 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 229 183 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P newex 211 232 47 196617 poltocar;
> #P newex 211 159 29 196617 * 4.;
> #P newex 169 159 29 196617 * 4.;
> #P flonum 211 117 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 169 117 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 169 56 67 196617 % 6.283186;
> #P newex 211 94 23 196617 cos;
> #P newex 169 94 21 196617 sin;
> #P comment 259 265 14 196617 y;
> #P connect 53 0 59 0;
> #P connect 59 0 48 1;
> #P connect 55 0 60 0;
> #P connect 60 0 48 2;
> #P connect 54 0 61 0;
> #P connect 61 0 48 3;
> #P connect 26 0 3 0;
> #P connect 3 0 1 0;
> #P connect 1 0 4 0;
> #P connect 4 0 6 0;
> #P fasten 46 0 6 0 254 153 174 153;
> #P fasten 46 2 6 1 282 153 193 153;
> #P connect 22 0 20 0;
> #P fasten 20 0 21 0 208 415;
> #P fasten 48 0 19 0 32 438 208 438;
> #P fasten 27 0 19 0 313 438 208 438;
> #P fasten 21 1 19 0 248 438 208 438;
> #P connect 21 0 19 0;
> #P fasten 24 0 19 0 176 438 208 438;
> #P fasten 3 0 2 0 174 76 216 76;
> #P connect 2 0 5 0;
> #P connect 5 0 7 0;
> #P fasten 46 1 7 0 268 153 216 153;
> #P fasten 13 0 8 0 234 227 216 227;
> #P connect 7 0 8 0;
> #P connect 8 0 10 0;
> #P connect 59 1 49 0;
> #P lcolor 10;
> #P connect 10 0 49 0;
> #P connect 49 0 24 1;
> #P connect 59 2 49 1;
> #P lcolor 10;
> #P connect 9 0 13 0;
> #P fasten 46 3 7 1 296 153 235 153;
> #P connect 13 1 8 1;
> #P connect 36 0 46 0;
> #P connect 6 0 12 0;
> #P connect 60 1 50 0;
> #P lcolor 10;
> #P connect 12 0 50 0;
> #P connect 50 0 24 2;
> #P connect 60 2 50 1;
> #P lcolor 10;
> #P fasten 8 1 11 0 253 257 296 257;
> #P connect 61 1 51 0;
> #P lcolor 10;
> #P connect 11 0 51 0;
> #P connect 51 0 24 3;
> #P connect 61 2 51 1;
> #P lcolor 10;
> #P connect 28 0 27 1;
> #P connect 41 0 40 0;
> #P fasten 42 0 40 0 411 167 395 167;
> #P connect 40 0 35 0;
> #P hidden connect 44 0 29 0;
> #P connect 35 0 29 0;
> #P connect 29 0 27 2;
> #P fasten 3 0 39 0 174 76 436 76;
> #P connect 39 0 40 1;
> #P connect 40 1 38 0;
> #P hidden connect 43 0 30 0;
> #P connect 38 0 30 0;
> #P connect 30 0 27 3;
> #P hidden connect 41 0 43 0;
> #P hidden connect 42 0 44 0;
> #P pop;
>
----------------------------------------------------

To look around while staying still, you need to keep your camera set to 0. 0. 0. and change your lookat points. How you do this is the question, there are many ways. I know you've already checked out my glNavigator abstractions, they allows for infinite rotation around the y axis by using the mouse. You might want to look closely at that stuff. Otherwise, manually adjusting the lookat coordinates with number boxes will work, but to get the values to form a smooth sphere will take a little trig. Again, you might find what you want in the glNavigator abstractions. Fool around with it and tell me how it goes.

forgot to add the link to the glNavigators:

https://cycling74.com/forums/index.php?t=rview&th=27757&rid=3109

Here's a quick example patch that uses a dial for infinite lookat rotation along the x/z plane and a multislider for rotation along the y axis. Hope it helps clarify.

Quote: Zachary Seldess wrote on Tue, 04 September 2007 19:51

> Here's a quick example patch that uses a dial for infinite lookat rotation along the x/z plane and a multislider for rotation along the y axis. Hope it helps clarify.

> #P hidden newex 298 158 41 196617 t 90 4.;

> #P hidden newex 298 135 48 196617 loadbang;

> #P user multiSlider 229 42 21 108 -1. 1. 1 2681 47 0 0 2 0 0 0;

> #P comment 248 182 121 196617 adjust camera position;

> #P flonum 287 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P flonum 329 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P flonum 245 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;

> #P newex 233 303 137 196617 pak camera 0. 0. 0.;

> #P comment 82 163 164 196617 generate x/z values;

> #P comment 159 109 164 196617 convert from degrees into radians;

> #P flonum 31 186 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

I did check your flyingSims patch and it does give me the answer of "looking around" questions. This simple example helps me more about something I didn't understand before. Thank you so much. I am very appreciate your kindly help. :)

Quote: Zachary Seldess wrote on Tue, 04 September 2007 19:51
----------------------------------------------------
> Here's a quick example patch that uses a dial for infinite lookat rotation along the x/z plane and a multislider for rotation along the y axis. Hope it helps clarify.
>
>
> max v2;
> #N vpatcher 473 283 986 786;
> #P origin 0 -13;
> #P window setfont Geneva 9.;
> #P window linecount 1;
> #P hidden newex 298 158 41 196617 t 90 4.;
> #P hidden newex 298 135 48 196617 loadbang;
> #P comment 218 26 46 196617 y lookat;
> #P user multiSlider 229 42 21 108 -1. 1. 1 2681 47 0 0 2 0 0 0;
> #M frgb 0 0 0;
> #M brgb 255 255 255;
> #M rgb2 127 127 127;
> #M rgb3 0 0 0;
> #M rgb4 37 52 91;
> #M rgb5 74 105 182;
> #M rgb6 112 158 18;
> #M rgb7 149 211 110;
> #M rgb8 187 9 201;
> #M rgb9 224 62 37;
> #M rgb10 7 114 128;
> #P newex 329 238 40 196617 t b f f;
> #P newex 287 238 40 196617 t b f f;
> #P newex 245 238 40 196617 t b f f;
> #P comment 248 182 121 196617 adjust camera position;
> #P comment 340 201 14 196617 z;
> #P comment 258 201 14 196617 x;
> #P flonum 287 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 329 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 245 217 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P comment 295 201 14 196617 y;
> #P newex 233 303 137 196617 pak camera 0. 0. 0.;
> #P newex 191 278 27 196617 + 0.;
> #P newex 149 278 27 196617 + 0.;
> #P newex 107 278 27 196617 + 0.;
> #N vpatcher 118 244 465 511;
> #P outlet 68 210 15 0;
> #P outlet 31 210 15 0;
> #P inlet 31 35 15 0;
> #P window setfont Geneva 9.;
> #P comment 82 163 164 196617 generate x/z values;
> #P comment 159 109 164 196617 convert from degrees into radians;
> #P window setfont "Sans Serif" 9.;
> #P newex 31 133 47 131137545 t 1. f;
> #P window setfont Geneva 9.;
> #P flonum 31 186 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 68 186 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window setfont "Sans Serif" 9.;
> #P newex 31 107 125 131137545 expr ($f1 * 3.141593) / 180.;
> #P window setfont Geneva 9.;
> #P newex 31 160 47 196617 poltocar;
> #P newex 31 82 40 196617 % 360;
> #P newex 31 57 37 196617 + 181;
> #P comment 73 84 100 196617 straigth up is now 0;
> #P connect 10 0 1 0;
> #P connect 1 0 2 0;
> #P connect 2 0 4 0;
> #P connect 4 0 7 0;
> #P connect 7 0 3 0;
> #P connect 3 0 6 0;
> #P connect 6 0 11 0;
> #P connect 7 1 3 1;
> #P connect 3 1 5 0;
> #P connect 5 0 12 0;
> #P pop;
> #P hidden newobj 107 156 94 196617 p lookat_x/z;
> #B color 12;
> #P user dial 107 42 108 108 360 1 0 0 157 359 1 1. 101 85 147 221 221 221 120 120 120 225 225 225 0 0 0 0 0 0;
> #P newex 191 237 27 196617 t f f;
> #P newex 149 237 27 196617 t f f;
> #P newex 107 237 27 196617 t f f;
> #P comment 110 181 121 196617 adjust center of rotation;
> #P comment 202 200 14 196617 z;
> #P comment 120 200 14 196617 x;
> #P flonum 149 216 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 191 216 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 107 216 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P comment 157 200 14 196617 y;
> #P newex 65 302 138 196617 pak lookat 0. 0. 0.;
> #P window linecount 2;
> #P newex 9 439 468 196617 jit.gl.gridshape sphere_rotate @shape cube @scale 10. 10. 10. @poly_mode 1 1 @lighting_enable 1 @depth_enable 1 @color 1. 1. 0. 1.;
> #P window linecount 1;
> #P newex 9 416 468 196617 jit.gl.gridshape sphere_rotate @shape cube @scale 1.5 0.05 0.5 @lighting_enable 1 @depth_enable 1;
> #P newex 9 394 450 196617 jit.gl.gridshape sphere_rotate @shape sphere @scale 1. 1. 1. @lighting_enable 1 @depth_enable 1;
> #P toggle 9 279 15 0;
> #P newex 9 324 50 196617 t b erase;
> #P newex 9 302 52 196617 metro 20;
> #P newex 9 351 363 196617 jit.gl.render sphere_rotate @erase_color 0. 0. 0. 1 @axes 1 @camera 0. 0. 4.;
> #P newex 9 373 197 196617 jit.window sphere_rotate @depthbuffer 1;
> #P comment 131 25 57 196617 x/z lookat;
> #P connect 5 0 3 0;
> #P fasten 3 0 4 0 14 323;
> #P fasten 25 0 2 0 238 346 14 346;
> #P connect 4 0 2 0;
> #P fasten 4 1 2 0 54 346 14 346;
> #P fasten 9 0 2 0 70 346 14 346;
> #P hidden connect 39 0 20 0;
> #P hidden connect 20 0 21 0;
> #P hidden connect 21 0 11 0;
> #P connect 11 0 17 0;
> #P connect 17 0 22 0;
> #P connect 33 0 22 0;
> #P lcolor 10;
> #P connect 22 0 9 1;
> #P connect 33 1 22 1;
> #P lcolor 10;
> #P hidden connect 36 0 13 0;
> #P connect 13 0 18 0;
> #P connect 18 0 23 0;
> #P connect 34 0 23 0;
> #P lcolor 10;
> #P connect 23 0 9 2;
> #P connect 34 1 23 1;
> #P lcolor 10;
> #P hidden connect 21 1 12 0;
> #P connect 12 0 19 0;
> #P connect 19 0 24 0;
> #P connect 35 0 24 0;
> #P lcolor 10;
> #P connect 24 0 9 3;
> #P connect 35 1 24 1;
> #P lcolor 10;
> #P connect 27 0 33 0;
> #P connect 33 2 25 1;
> #P connect 29 0 34 0;
> #P hidden connect 38 0 39 0;
> #P connect 34 2 25 2;
> #P hidden connect 39 1 28 0;
> #P connect 28 0 35 0;
> #P connect 35 2 25 3;
> #P pop;
>
----------------------------------------------------

have been modifying this orbital rotation patch to integrate it with the 3d navigator we have recently purchased.

http://www.iamas.ac.jp/~aka/max/#aka_spacenavigator

however, have been trying to add another feature into this patch. i would like to be able to rotate the camera on its own axis whilst staying locked on the object. i have attached a patch with my attempt but my trig keeps letting me down... feel like i'm close, but brain is starting to throb! there are some comments which should explain where i'm at.

aka.navigator object - http://www.iamas.ac.jp/~aka/max/#aka_spacenavigator

What do you mean by "locked on the object" - do you mean that you want to rotate your camera while keeping your lookat point focussed on the object? Or something else?

Quote: Zachary Seldess wrote on Tue, 11 September 2007 04:55

> What do you mean by "locked on the object" - do you mean that you want to rotate your camera while keeping your lookat point focussed on the object? Or something else?

yes, so that as the camera is "orbiting" around the object, it is also spinning on its own axis. but only on an axis which will enable it to remain focused on the object, otherwise it would not be looking at the central object.

i've had another go at it this morning, but the problem seems to be different then i first thought. the rotation now sort of works but it's not steady, seems to accelerate at certain points.... hmmm, back to the trig then - and cheers for looking into it.

below is a new version of the patch with comments.

Quote: Zachary Seldess wrote on Tue, 11 September 2007 04:55
----------------------------------------------------
> Hi Justin,
>
> What do you mean by "locked on the object" - do you mean that you want to rotate your camera while keeping your lookat point focussed on the object? Or something else?
>
> Zachary
----------------------------------------------------

Don't have max at my disposal to try your patch, but maybe this can be of

(you might be able to get the rotation of your camera, while staying

focussed, figured out using the 'up' of the cam)

> Quote: Zachary Seldess wrote on Tue, 11 September 2007 04:55

> ----------------------------------------------------

>> What do you mean by "locked on the object" - do you mean that you want

>> to rotate your camera while keeping your lookat point focussed on the

> yes, so that as the camera is "orbiting" around the object, it is also

> spinning on its own axis. but only on an axis which will enable it to

> remain focused on the object, otherwise it would not be looking at the

> i've had another go at it this morning, but the problem seems to be

> different then i first thought. the rotation now sort of works but it's

> not steady, seems to accelerate at certain points.... hmmm, back to the

> trig then - and cheers for looking into it.

> below is a new version of the patch with comments.

> #P comment 198 72 227 196620 2. experiment with the x/z and the y axes -

> you should notice flips when at 0. and strange accelerations in rotation

> #P comment 771 516 123 196617 turn rotation lfo on / off;

> #P comment 874 580 123 196617 direction;

> #P comment 824 561 123 196617 degrees per render bang;

> #P flonum 788 561 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 744 694 57 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

Don't have max at my disposal to try your patch, but maybe this can be of
help...
(you might be able to get the rotation of your camera, while staying
focussed, figured out using the 'up' of the cam)

>
> Quote: Zachary Seldess wrote on Tue, 11 September 2007 04:55
> ----------------------------------------------------
>> Hi Justin,
>>
>> What do you mean by "locked on the object" - do you mean that you want
>> to rotate your camera while keeping your lookat point focussed on the
>> object? Or something else?
>>
>> Zachary
> ----------------------------------------------------
>
> yes, so that as the camera is "orbiting" around the object, it is also
> spinning on its own axis. but only on an axis which will enable it to
> remain focused on the object, otherwise it would not be looking at the
> central object.
>
> i've had another go at it this morning, but the problem seems to be
> different then i first thought. the rotation now sort of works but it's
> not steady, seems to accelerate at certain points.... hmmm, back to the
> trig then - and cheers for looking into it.
>
> below is a new version of the patch with comments.
>
> j
>
> #P window setfont "Sans Serif" 12.;
> #P window linecount 4;
> #P comment 198 72 227 196620 2. experiment with the x/z and the y axes -
> you should notice flips when at 0. and strange accelerations in rotation
> on other than 0.;
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P newex 680 125 32 196617 r rot;
> #P comment 771 516 123 196617 turn rotation lfo on / off;
> #P toggle 744 515 15 0;
> #P newex 744 535 29 196617 gate;
> #P newex 753 667 32 196617 s rot;
> #P comment 855 624 123 196617 reset;
> #P comment 874 580 123 196617 direction;
> #P message 840 624 14 196617 0;
> #P message 840 580 33 196617 -360;
> #P message 815 580 26 196617 360;
> #P comment 824 561 123 196617 degrees per render bang;
> #P flonum 788 561 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 764 580 32 196617 f 0.1;
> #P newex 744 558 30 196617 t b b;
> #P flonum 744 694 57 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 764 620 68 196617 * 6.283185;
> #P newex 764 599 40 196617 / 360.;
> #P newex 744 643 50 196617 accum 0.;
> #P newex 435 330 29 196617 t b f;
> #P newex 427 354 37 196617 * 1.;
> #P window setfont "Sans Serif" 12.;
> #P window linecount 3;
> #P comment 730 430 179 196620 1. turn this rotation lfo on to set the
> camera rotating on its own axis.;
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P comment 206 140 153 196617 camera rotation around its orbit;
> #P comment 680 105 153 196617 camera rotation on its own axis;
> #P comment 745 170 123 196617 * fix offset;
> #P newex 680 170 64 196617 + 1.570796;
> #P flonum 680 151 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P comment 718 152 123 196617 rotation around x/z axes;
> #P newex 722 318 47 196617 poltocar;
> #P newex 722 295 29 196617 * 1.;
> #P newex 680 295 29 196617 * 1.;
> #P flonum 722 253 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 680 253 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 680 192 67 196617 % 6.283186;
> #P newex 722 230 23 196617 cos;
> #P newex 680 230 21 196617 sin;
> #P newex 190 410 40 196617 t f b f;
> #P newex 148 410 40 196617 t f b f;
> #P newex 106 410 40 196617 t f b f;
> #P comment 109 354 121 196617 adjust center of rotation;
> #P comment 201 373 14 196617 z;
> #P comment 119 373 14 196617 x;
> #P flonum 148 389 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 190 389 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P flonum 106 389 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P comment 156 373 14 196617 y;
> #P newex 328 452 27 196617 + 0.;
> #P newex 288 452 27 196617 + 0.;
> #P newex 248 452 27 196617 + 0.;
> #P newex 64 475 138 196617 pak lookat 0. 0. 0.;
> #P newex 47 661 618 196617 jit.gl.gridshape sphere_rotate @shape cube
> @scale 10. 10. 10. @poly_mode 1 1 @lighting_enable 1 @depth_enable 1
> @color 1. 1. 0. 1.;
> #P newex 286 261 53 196617 t b b f f;
> #P window linecount 2;
> #P comment 451 226 168 196617 choose y-rotation behavior ; 1 is like
> doing flips around the ball ;;
> #P window linecount 1;
> #P newex 427 272 37 196617 abs 0.;
> #P window linecount 2;
> #P comment 286 215 106 196617 change amplitude (distance from object);
> #P flonum 286 241 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P window linecount 1;
> #P newex 427 295 240 196617 if $f1 < 1.570796 || $f1 > 4.71239 then 1.
> else -1.;
> #P window setfont Times 10.;
> #P comment 433 386 48 1310730 up vector;
> #P comment 484 400 39 1310730 z;
> #P comment 442 400 39 1310730 y;
> #P comment 399 400 39 1310730 x;
> #P window setfont "Fixedwidth Serif" 9.;
> #P flonum 468 416 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 427 416 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 386 416 39 9 0 0 0 22 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window setfont "Fixedwidth Serif" 10.;
> #P newex 345 475 133 1441802 pak up 0. 1. 0.;
> #P window setfont "Sans Serif" 9.;
> #P flonum 206 164 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P newex 47 638 468 196617 jit.gl.gridshape sphere_rotate @shape cube
> @scale 1.5 0.05 0.5 @lighting_enable 1 @depth_enable 1;
> #P newex 208 475 131 196617 pak camera 0. 0. 0.;
> #P newex 47 616 450 196617 jit.gl.gridshape sphere_rotate @shape sphere
> @scale 1. 1. 1. @lighting_enable 1 @depth_enable 1;
> #P toggle 574 419 15 0;
> #P newex 574 464 58 196617 t b b erase;
> #P newex 574 442 52 196617 metro 20;
> #P newex 240 573 363 196617 jit.gl.render sphere_rotate @erase_color 0. 0.
> 0. 1 @axes 1 @camera 4. 0. 0.;
> #P newex 47 595 251 196617 jit.window sphere_rotate @depthbuffer 1
> @floating 1;
> #P comment 305 314 112 196617 rotation around y axis;
> #P comment 244 165 123 196617 rotation around x/z axes;
> #P comment 339 395 14 196617 z;
> #P comment 261 395 14 196617 x;
> #P newex 266 335 29 196617 t b f;
> #P flonum 288 411 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 328 411 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 248 411 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 266 313 35 9 0 0 0 3 0 0 0 94 232 0 222 222 222 0 0 0;
> #P newex 248 362 47 196617 poltocar;
> #P newex 248 289 29 196617 * 4.;
> #P newex 206 289 29 196617 * 4.;
> #P flonum 248 247 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 206 247 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P newex 206 186 67 196617 % 6.283186;
> #P newex 248 224 23 196617 cos;
> #P newex 206 224 21 196617 sin;
> #P comment 296 395 14 196617 y;
> #P connect 73 0 76 0;
> #P connect 73 0 86 0;
> #P connect 58 0 56 0;
> #P fasten 58 0 57 0 685 212 727 212;
> #P connect 3 0 1 0;
> #P fasten 3 0 2 0 211 206 253 206;
> #P fasten 3 0 38 0 211 206 432 206;
> #P connect 79 0 78 1;
> #P connect 77 1 78 0;
> #P connect 78 0 74 0;
> #P connect 90 0 65 0;
> #P connect 88 0 87 0;
> #P fasten 21 1 87 1 603 508 768 508;
> #P connect 87 0 77 0;
> #P fasten 83 0 73 0 845 641 749 641;
> #P connect 82 0 74 1;
> #P connect 81 0 74 1;
> #P connect 77 0 73 0;
> #P fasten 21 2 19 0 627 527 245 527;
> #P fasten 21 0 19 0 579 527 245 527;
> #P fasten 20 0 21 0 579 463;
> #P connect 75 0 73 1;
> #P connect 74 0 75 0;
> #P connect 47 0 53 0;
> #P connect 53 0 42 1;
> #P connect 49 0 54 0;
> #P connect 54 0 42 2;
> #P connect 48 0 55 0;
> #P connect 55 0 42 3;
> #P connect 26 0 3 0;
> #P connect 1 0 4 0;
> #P connect 4 0 6 0;
> #P fasten 40 0 6 0 291 283 211 283;
> #P fasten 40 2 6 1 319 283 230 283;
> #P connect 22 0 20 0;
> #P fasten 42 0 19 0 69 568 245 568;
> #P fasten 27 0 19 0 350 568 245 568;
> #P fasten 24 0 19 0 213 568 245 568;
> #P connect 2 0 5 0;
> #P connect 5 0 7 0;
> #P fasten 40 1 7 0 305 283 253 283;
> #P fasten 13 0 8 0 271 357 253 357;
> #P connect 7 0 8 0;
> #P connect 8 0 10 0;
> #P connect 53 1 43 0;
> #P lcolor 10;
> #P connect 10 0 43 0;
> #P connect 43 0 24 1;
> #P connect 53 2 43 1;
> #P lcolor 10;
> #P connect 9 0 13 0;
> #P fasten 40 3 7 1 333 283 272 283;
> #P connect 13 1 8 1;
> #P connect 36 0 40 0;
> #P connect 6 0 12 0;
> #P connect 54 1 44 0;
> #P lcolor 10;
> #P connect 12 0 44 0;
> #P connect 44 0 24 2;
> #P connect 54 2 44 1;
> #P lcolor 10;
> #P fasten 8 1 11 0 290 387 333 387;
> #P connect 55 1 45 0;
> #P lcolor 10;
> #P connect 11 0 45 0;
> #P connect 45 0 24 3;
> #P connect 55 2 45 1;
> #P lcolor 10;
> #P fasten 63 0 28 0 727 377 391 377;
> #P connect 28 0 27 1;
> #P connect 38 0 35 0;
> #P connect 72 0 71 0;
> #P connect 35 0 71 0;
> #P connect 71 0 29 0;
> #P connect 29 0 27 2;
> #P fasten 61 0 72 0 685 323 440 323;
> #P connect 72 1 71 1;
> #P fasten 63 1 30 0 764 377 473 377;
> #P connect 30 0 27 3;
> #P connect 65 0 66 0;
> #P connect 66 0 58 0;
> #P connect 56 0 59 0;
> #P connect 59 0 61 0;
> #P connect 57 0 60 0;
> #P connect 60 0 62 0;
> #P connect 62 0 63 0;
> #P window clipboard copycount 92;
>
>


You're going to have to contanstly manipulate the up vector as you rotate. I'll look into this when I have more time. Here's a modified version of my previous patch. Toggle the gate to off and, change the 'up' and then rotate. You'll see that the 'up' doesn't get redefined as you rotate - that's the tricky part. If you only manipulate two of the three axis of the up vector you're going to get an unsteady rate of rotation - markedly as you get close to aligning with one of the changing axes. So we have to figure out the formula for changing all three up axes.

Also, Brecht, nice patch. It offers a slightly different approach.

You're going to have to contanstly manipulate the up vector as you rotate. I'll look into this when I have more time. Here's a modified version of my previous patch. Toggle the gate to off and, change the 'up' and then rotate. You'll see that the 'up' doesn't get redefined as you rotate - that's the tricky part. If you only manipulate two of the three axis of the up vector you're going to get an unsteady rate of rotation - markedly as you get close to aligning with one of the changing axes. So we have to figure out the formula for changing all three up axes. 

zachary's example is close to what i'm trying to achieve, but seems to suffer the same problem i had - which is the pole / acceleration issue.

hmm... think i'll leave this on the shelf until i have more time to think about it!

Ok, here's a version that "rolls" the camera smoothly no matter where the camera is rotated around the y axis, but the angle made between the pos y axis and the lookat point -> camera point vector must be 90 degrees. I've changed the patch to make it clearer. It's getting there...

correction: lookat point -> camera point vector must be perpendicular to y axis (not just pos y).

presumably the perpendicular angle is to keep the camera focused on object whilst keeping it at the right distance from the centre?

so the equation needs to maintain that angle as it rotates round the x axis and / or the y axis...

i'm trying to come up with something helpful but need more coffee - keep em coming!

presumably the perpendicular angle is to keep the camera focused on object whilst keeping it at the right distance from the centre?
so the equation needs to maintain that angle as it rotates round the x axis and / or the y axis...

The perpendicular angle with the y axis has to do with the way the x and z axes relate. As you "roll, the x and z up values are either the same or oppositely signed - depending on how the camera is rotated around the y axis. Look in "p modSin" to see how this works. And watch how the x and z axes either rotate together or in exact opposite directions depending on where the camera is.

This seems like a fine way to do it, if we don't want to vertically rotate. The math is more complex if we do though...

The perpendicular angle with the y axis has to do with the way the x and z axes relate. As you "roll, the x and z up values are either the same or oppositely signed - depending on how the camera is rotated around the y axis. Look in "p modSin" to see how this works. And watch how the x and z axes either rotate together or in exact opposite directions depending on where the camera is. 

This seems like a fine way to do it, if we don't want to vertically rotate. The math is more complex if we do though...


Control camera?