3 replies to this topic

[hopbin9]

Hi,

I want to be able to transform a Shape SOP so that it's directly overtop of a scene object.

My thought is to transform the scene object's location into camera space, and then use those coordinates but I can't figure out how to do that.

Does anyone know how to get a Shape SOP to track the movement of a scene object that was rendered?

Thanks,

[hopbin9]

Sorry, meant to say COP nodes.

I still can't figure this out. I have to position some sprites over top of some objects in the scene. Can't figure out how to translate a point in the scene into a 2D screen location for compositing?

I did find that you can get the view transformation matrix from a viewport, but not directly from a camera.

Seems strange to me that this isn't easily done in Houdini.

[Jason]

hopbin9, on 25 May 2011 - 06:03 PM, said:

Sorry, meant to say COP nodes.

I still can't figure this out. I have to position some sprites over top of some objects in the scene. Can't figure out how to translate a point in the scene into a 2D screen location for compositing?

I did find that you can get the view transformation matrix from a viewport, but not directly from a camera.

Seems strange to me that this isn't easily done in Houdini.

Yeah, I do wish they'd add more support for camera matrices.  But could you describe your problem with (edited) images or a hipfile perhaps? I'm having a hard time really understanding what you're after.

[graham]

Getting the view transform from a viewport is the same as getting the world transform from your camera object.