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GPU-based raycaster for Unity

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Graphics-Raycast

GPU-based raycaster for Unity which raycasts against MeshRenderers, rather than colliders.

This method requires reading from the GPU to CPU and is much slower, but still has its uses.

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Instructions

Call the static function, like you would with Physics.Raycast:

GraphicsRaycast.Raycast(Vector3 origin, Vector3 direction, out RaycastHit hit, float maxDistance, int layerMask = -1);

Optionally, you can draw a gizmo in a similar manner: GraphicsRaycast.DrawGizmo(bool hasHit, Vector3 origin, Vector3 direction, RaycastHit hit, float maxDistance = 25f, float size = 1f);

For it to work in a build, ensure the GraphicRaycastShader.shader file is in the "Always included shaders" list under Graphics Settings. Alternatively, move it into a folder named "Resources".

Limitations

  • Not compatible with any Scriptable Render Pipelines (uses SetReplacementShader)
  • Does not work with any geometry drawn through Graphics.DrawMeshInstanced, as these are outside of the regular render loop.
  • Does not work with objects using Unlit or Transparent materials, or other shaders not writing to the depth texture.
  • Won't work when called through OnSceneGUI (the active render texture apparently cannot be modified during this stage).

Future improvements

  • Add override function to raycast from a camera's center. This could simply read the depth- and normals buffer and return the result, and would also work with anything rendered manually through the Graphics API. Very useful for a Depth of Field auto-focus function.

License

MIT License (see LICENSE)

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GPU-based raycaster for Unity

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