HLSL Shaders
Method #
The Custom CSG Code field allows you to write a line of HLSL code to implement your own CSG operation. This requires a working knowledge of HLSL and signed distance fields.
The inputs to the operation are:
| Input | Description |
|---|---|
float blendWeight; |
The value of the CSG Blend Weight attribute. |
float dist; |
The signed distance field value calculated by the node you are adding the custom operation to. |
float sdfValue; |
The current signed distance field value to combine with. This was calculated by other nodes in the graph. |
To produce an output from your operation, you must overwrite sdfValue with the result of your CSG operation.
Here is an example line of HLSL code which will implement a union CSG operation with an additional blending capability:
sdfValue = lerp(sdfValue, min(sdfValue, dist), blendWeight);
As another example, to mimic the replace CSG operation the code would be as follows:
sdfValue = dist;
Example HLSL Shader #
sdfValue = lerp(sdfValue, min(sdfValue, dist), blendWeight);