https://github.com/staggartcreations/Graphics-Raycast

GPU-based raycaster for Unity
https://github.com/staggartcreations/Graphics-Raycast

Last synced: 3 months ago
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GPU-based raycaster for Unity

• Host: GitHub
• URL: https://github.com/staggartcreations/Graphics-Raycast
• Owner: staggartcreations
• License: mit
• Created: 2019-05-12T12:38:06.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-07-23T12:08:17.000Z (over 1 year ago)
• Last Synced: 2024-07-28T21:46:54.294Z (4 months ago)
• Language: C#
• Size: 10.7 KB
• Stars: 145
• Watchers: 6
• Forks: 23
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
# 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.

![alt text](https://i.imgur.com/625lQ2s.gif "")

Instructions

------------

Call the static function, like you would with [Physics.Raycast](https://docs.unity3d.com/ScriptReference/Physics.Raycast.html):

`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](https://docs.unity3d.com/Manual/class-GraphicsSettings.html). 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

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MIT License (see [LICENSE](LICENSE.md))