How to pass values from scripts to constant buffers?

Unity Engine
1

Hi,

If I understand well, constant buffers allow to group some variables so several different shaders can use them without duplicating it. Am I right?

Anyway, my big question is: how to pass values to these variables from scripts? I just can’t figure out how I should do that…

For example in TerrainEngine.cginc, how can I set the value of “_CameraPosition” from a script?

CBUFFER_START(UnityTerrain)
	// grass
	fixed4 _WavingTint;
	float4 _WaveAndDistance;	// wind speed, wave size, wind amount, max sqr distance
	float4 _CameraPosition;		// .xyz = camera position, .w = 1 / (max sqr distance)
	float3 _CameraRight, _CameraUp;
	
	// trees
	float4 _Scale;
	float4x4 _TerrainEngineBendTree;
	float4 _SquashPlaneNormal;
	float _SquashAmount;
	
	// billboards
	float3 _TreeBillboardCameraRight;
	float4 _TreeBillboardCameraUp;
	float4 _TreeBillboardCameraFront;
	float4 _TreeBillboardCameraPos;
	float4 _TreeBillboardDistances; // x = max distance ^ 2
CBUFFER_END

Thanks!

2

Hi,
here try this hope it gna help

http://docs.unity3d.com/Documentation/ScriptReference/Material.SetFloat.html