When/where is the model matrix set?

Unity Engine
1

Hi,

I have a procedural shader dispatched with a DrawProcedural() call inside OnRenderObject() for one of my components.

While UNITY_MATRIX_MVP contains the correct camera and projection transforms, the transform for the object the component is attached to are not present.

When does Unity set the model/world transforms?
(Or, in what callback should I call DrawProcedural() to ensure they are in UNITY_MATRIX_MVP?)

Sj

2

What do you mean by “not present”?

see:
http://docs.unity3d.com/Manual/ExecutionOrder.html

When OnRenderObject is called the matrices should be updated to match whatever has been done in Update, LateUpdate, FixedUpdate, …

3

Thanks ericbegue, I will give that link a thorough look. By “not present” I mean the transform supplied to the shader remains the same, regardless of the parameters of the Transform of the gameobject to which the component script is attached.

4

Was this ever resolved? I am having a similar problem.

5

Ok I solved this by using a CommandBuffer, the DrawProcedural function in the CommandBuffer class takes a matrix. I then just used Graphics.ExecuteCommandBuffer