Thijs Koerselman

Coming back on this old post I never got a reply to...Not that I've spent a

whole year on this but I still can't figure it out:-)

If you use the mouse input to autorotate a jit.gl.handle all axis are

rotating most of the time. How is this calculated? I can't get my head

around it. I guess the mouse input generates a vector that is used to

compute the rotation and speed on every axis, but how?

I'd like to store/recall the vector and speed to compute the rotate or

rotatexyz parameters without using jit.gl.handle and without actual mouse

input. Can someone with better math skills help me out please?

Coming back on this old post I never got a reply to...Not that I've spent a
whole year on this but I still can't figure it out:-)

If you use the mouse input to autorotate a jit.gl.handle all axis are
rotating most of the time. How is this calculated? I can't get my head
around it. I guess the mouse input generates a vector that is used to
compute the rotation and speed on every axis, but how?

I'd like to store/recall the vector and speed to compute the rotate or
rotatexyz parameters without using jit.gl.handle and without actual mouse
input. Can someone with better math skills help me out please?

re-max-msp-faking-jit-gl-handle-autorotate

Try this patch out. It's really basic, but a start. The next

modification I would make would be to add the ability to change

rotation speed on the fly and not just at the end of a revolution as

Hi Thijs,
Try this patch out.  It's really basic, but a start.  The next
modification I would make would be to add the ability to change
rotation speed on the fly and not just at the end of a revolution as
it now stands.

Hi Wes, from what I understand your approach is similar to the one I use

right now (rotating one axis - the other 2 fixed offsets - moving the camera

The problem is that using the mouse input on a handle, there are 3 axis

involved in the rotation. Your patch doesn't explain to me how to generate a

rotation like that. (without moving around the camera/scene)

I think this is more obvious looking at a plane then a torus. Forgive me if

I'm being stupid, but I don't know how I can explain myself otherwise.

Hi Wes, from what I understand your approach is similar to the one I use
right now (rotating one axis - the other 2 fixed offsets - moving the camera
around).
The problem is that using the mouse input on a handle, there are 3 axis
involved in the rotation. Your patch doesn't explain to me how to generate a
rotation like that. (without moving around the camera/scene)

I think this is more obvious looking at a plane then a torus. Forgive me if
I'm being stupid, but I don't know how I can explain myself otherwise.

I'm not sure if the Jitter3DUtils or even JavaScript support was 

available when you first asked your question. But now the answer is 

simple: use the quaternion rotation code from the Jitter3dUtils. 

Keep track of your rotation as a quaternion, accumulating it with 

add_quats. Use quat_to_axis to convert into axis/angle format. 

Plenty of intro-to-quaternions stuff from the gave development world 

I'm not sure if the Jitter3DUtils or even JavaScript support was  
available when you first asked your question.  But now the answer is  
simple: use the quaternion rotation code from the Jitter3dUtils.   
Keep track of your rotation as a quaternion, accumulating it with  
add_quats.  Use quat_to_axis to convert into axis/angle format.   
Plenty of intro-to-quaternions stuff from the gave development world  
should be available through Google.

The JS3dutils xyz_to_quat is a good place to look for what Randy is

talking about. In the previous patch, you can add more rotation by

The JS3dutils xyz_to_quat is a good place to look for what Randy is
talking about.  In the previous patch, you can add more rotation by
the following:

I'd suggest looking at both the Jitter3DUtils.js (c74:/js-extensions) 

and the topic on joyrotate/nudgexyz which has some of these things 

duplicated, but provides a nudgexyz method.

https://cycling74.com/forums/index.php?t=msg&goto=417

We could add this in a future version of Jitter3DUtils.js

I'd suggest looking at both the Jitter3DUtils.js (c74:/js-extensions)  
and the topic on joyrotate/nudgexyz which has some of these things  
duplicated, but provides a nudgexyz method.

 https://cycling74.com/forums/index.php?t=msg&goto=417 63

Thanks guys! that's exactly what I need. Last time I looked at Jitter3DUtils

I didn't understand anything so I couldn't remember whats in it either.

Quaternions is still a bit blurry but I'm getting there. The nudgexyz code

will definitely get me going. Thanks again.

Thanks guys! that's exactly what I need. Last time I looked at Jitter3DUtils
I didn't understand anything so I couldn't remember whats in it either.
Quaternions is still a bit blurry but I'm getting there. The nudgexyz code
will definitely get me going. Thanks again.

In case someone else cares to learn about quaternion rotations... I found

http://www.ogre3d.org/wiki/index.php/Quaternion_and_Rotation

In case someone else cares to learn about quaternion rotations... I found
this really clear and helpful

  http://www.ogre3d.org/wiki/index.php/Quaternion_and_Rotation _Primer

Re: [max-msp] faking jit.gl.handle autorotate