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Issue ID




Graphics.Blit will not apply the Material over the whole GameObject when the Material uses HDRP or Shader Graph shader

Package: SRP HD Template


How to reproduce:
1. Open the user's attached "Bugreport-Graphics.Blit" project
2. Open the "Scene" Scene
3. In the Hierarchy select the "Plane" GameObject
4. Enter the Play Mode

Expected results: The whole "Plane" GameObject becomes gray
Actual results: Only the corner of the "Plane" GameObject becomes gray

Reproducible with: 2019.3.0b5, 2019.4.8f1, 2020.1.3f1, 2020.2.0a21 (7.1.1, 10.0.0-preview.27)
Could not test with 2018.4.26f1 because of the CS0246 error, 2019.3.0b4 (HDRP 7.0.1) and lower because the shader would not apply

- The issue occurs only with these shaders:
HDRP Shader Graph
Shader Graph (when using either HDRP or URP. Built-in Render Pipeline does not support Shader Graph)
- Changing the ZTest to Always (or any other option) does not solve the issue
- Changing the Camera's Viewport does not solve the issue
- The issue has been tested and reproduced on Windows

  1. Resolution Note:

    Using a ShaderGraph like this with a Blit is not supposed to work. All current HDRP shader graphs are intended for 3D objects in the scene. As such they apply camera and projection transformations to all vertices, making it unsuitable for 2D blits like this.
    I suggest trying to use Custom Render Textures as they are much more suited for writing a brush painting tool:
    With scripting it is possible to generate strokes on specific part of a render texture.

Comments (1)

  1. cr4y

    Aug 26, 2020 16:24

    Why is it in category "Package: SRP HD Template"?
    I believe it should be "Package: ShaderGraph" instead, as it affects both Universal and HD Rendering Pipelines.

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