Mixedrealitytoolkit-unity: Clipping Primitives cause "Fade" mode materials to render more transparent than they should be

[Pycorax]

Describe the bug

Adding a Renderer to a Clipping Primitive will cause any materials using the MRTK Standard Shader with Fade mode on to appear more transparent than they actually should.

To reproduce

Steps to reproduce the behavior:

1. Create a new scene
2. Add a primitive cube and name it "Content"
3. Create a material with the MRTK Standard Shader and set to "Fade" mode
4. Drag and drop the material onto "Content"
5. Add another primitive cube and name it "Clipper"
6. Add a Clipping Primitive component to "Clipper"
7. Drag "Content" into the "Renderers" field of the Clipping Primitive component of the "Clipper"
8. Toggle the enabled state of the Clipping Primitive to observe the difference in the colour of the "Content" object

Expected behavior

Adding a Renderer to a Clipping Primitive with a material with MRTK Standard Shader on Fade mode should not change how the material is rendered aside from the clipped portions.

Screenshots

With Clipping Box enabled:

With Clipping Box disabled:

Your setup

• Unity 2019.3.2f1
• MRTK v2.3.0

Target platform

• HoloLens
• HoloLens 2
• AR Foundation (ARKit, ARCore)

[AlexisAG]

Hi, I had a problem with Clipping Primitive where my texture became completely transparent, it's not the same issue but maybe my solution can work for you.

When you set the renderingMode to Fade do you change "Blended Clipping Width" ? When I set it to '0' that fixes the problem. Have you tried that ?

[Pycorax]

@AlexisAG wow that actually fixed it. Thanks for the workaround.

[Cameron-Micka]

Thank you for reporting this. @AlexisAG is correct. The default "Blended Clipping Width" is 1 meter (which is probably a little large for most holograms).

I'll document this better for future developers.

[stale[bot]]

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