Accessing a ComputeBuffer from a surface shader after a ComputeShader writes to it [solved]

Hey all.

I have a compute shader writing values into a compute buffer. They're just positions. I then want to use those positions in the vertex shader of a surface shader.

Here's my init code for the compute buffer. I'm making it a global shader buffer here but setting it as an explicit buffer on the surface shader material doesn't seem to work either.

Code (CSharp):

1.  
2.         positionsBuffer = new ComputeBuffer(numNodes, 3 * sizeof(float));
3.         kernel = computeShader.FindKernel("ComputeNodePositions");
4.         positionsPID = Shader.PropertyToID("_KelpPositions");
5.         computeShader.SetBuffer(kernel, positionsPID, positionsBuffer);
6.         Shader.SetGlobalBuffer(positionsPID, positionsBuffer);
7.  

Here's the shader declaration:

Code (CSharp):

1.  
2. #ifdef SHADER_API_D3D11
3.         //uniform StructuredBuffer<float3> _KelpPositions : register(t1); // tried this too
4.         uniform RWStructuredBuffer<float3> _KelpPositions : register(u1);
5. #endif
6.  

Well, the positions buffer seems always to be zeroes. The compute shader is definitely putting data in there (its version of the buffer...?).

Any ideas? What am I doing wrong?

 

Wait! Stop!

Code (CSharp):

1.  
2. #ifdef SHADER_API_D3D11
3.         uniform StructuredBuffer<float3> _KelpPositions : register(t1); // this actually works after all!      
4. #endif
5.  

False alarm folks, thanks for being the rubber duck.

 

So? Maybe someone would love to know what happened with some more details. ... "someone"
It would also be useful if you could share the compute shader.
Also do you happen to know if this can be done via OpenGL API?