Kevin

I am working on a project that take video in, uses it as a texture over a (plato) shape- rendering ultimately to a jit.window. I am using Cyclops as the input for control of color and motion. Here's where I'm in need of your help...

How does one put text over the video, and NOT have the text change in relation to the plane of the rotated camera view? In other words, I want to keep the text (title of the work) in the same place (videoplane example as AndrewB was so kind to share with us) while allowing the gl moves to move the shape via the "camera" and "pak lookat" numbers?

I am working on a project that take video in, uses it as a texture over a (plato) shape- rendering ultimately to a jit.window.  I am using Cyclops as the input for control of color and motion.  Here's where I'm in need of your help...

How does one put text over the video, and NOT have the text change in relation to the plane of the rotated camera view?  In other words, I want to keep the text (title of the work) in the same place (videoplane example as AndrewB was so kind to share with us) while allowing the gl moves to move the shape via the "camera" and "pak lookat" numbers?

jitter-and-text-over-glw-camera-change

https://cycling74.com/forums/index.php?t=msg&th=19058

 &start=0&rid=1274&S=f84caaec3afd8b35d25704e948d4 b22a

It has a nice tutorial by vade explaining the principle. In the patch two black bars are rendered on top of the geometry, but the way this is done also works in the same way with jit.gl.2dtext (or 3dtext)

check out this post :  https://cycling74.com/forums/index.php?t=msg&th=19058 &start=0&rid=1274&S=f84caaec3afd8b35d25704e948d4 b22a
It has a nice tutorial by vade explaining the principle. In the patch two black bars are rendered on top of the geometry, but the way this is done also works in the same way with jit.gl.2dtext (or 3dtext)


Thanks... I will study these two... much appreciated.

if the only shape you have in your scene (apart form the text)

you might as well just rotate the shape, instead of moving the camera.

if there is more than one shape, it is still true that camera movements

may be substituted by movements of the shapes in your scene, but 

be little advantage regarding ease of programming.

if the only shape you have in your scene (apart form the text)
you might as well just rotate the shape, instead of moving the camera.
if there is more than one shape, it is still true that camera movements
may be substituted by movements of the shapes in your scene, but  
there would
be little advantage regarding ease of programming.
HtH
-jennek


you have to reset your camera position before you draw your text.

basically, use @automatic 0 for all of your rendering, and force a 

10 set camera position to where we want to be rotated

30 draw object that you want in front (opengl draws back to front... 

if you dont have depth_enable 1 and a depthbuffer 1 on 

40 set camera to origin (position 0. 0. 2, lookat 0. 0. 0. to 

60 send bang to jit.gl.render to actually 'draw' to the render context

this is really a much 'cleaner' way of doing it, as you can use it as 

a prototype and 'drop' any other GL objects in there and all will 

behave as expected, and you can separate your render chain to before 

rotation and after, so you can, if you wish, add your own little 

watermark to the lower left hand corner in GL, overlay another 

jit.gl.videoplane with an alpha channel over your whole animation, 

check Brechts post, he points to a patch he made that does it, and to 

one that I made. Both use the same exact principle. Sorry if im 

I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I 

You will not be saved by the Holy Ghost. You will not be saved by the 

basically, use @automatic 0 for all of your rendering, and force a  
specific drawing order

0 erase to jit.gl.render
10 set camera position to where we want to be rotated
20 draw object that you want behind
30 draw object that you want in front (opengl draws back to front...  
if you dont have depth_enable 1 and a depthbuffer 1 on  
jit.gl.window.. ;)
40 set camera to origin (position 0. 0. 2, lookat 0. 0. 0. to  
jit.gl.render)
50 draw jit.gl.text2d or 3d
60 send bang to jit.gl.render to actually 'draw' to the render context
70 goto 0

this is really a much 'cleaner' way of doing it, as you can use it as  
a prototype and 'drop' any other GL objects in there and all will  
behave as expected, and you can separate your render chain to before  
rotation and after, so you can, if you wish, add your own little  
watermark to the lower left hand corner in GL, overlay another  
jit.gl.videoplane with an alpha channel over your whole animation,  
etc etc.

check Brechts post, he points to a patch he made that does it, and to  
one that I made. Both use the same exact principle. Sorry if im  
repeating myself ;)

I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I LIVE! I  
LIVE! I LIVE! I LIVE! I LIVE!

You will not be saved by the Holy Ghost. You will not be saved by the  
God Plutonium.

Yes! Thank you! That did it. Your clarity and help are much appreciated!

Yes!  Thank you!  That did it.  Your clarity and help are much appreciated!


Jitter and Text over gl/w camera change