weird behavior of Principled BSDF in Cycles (normal -> emission?) #61137

New Issue

Kevin Wang · 2019-02-02T15:45:26+01:00

Kevin Wang commented

2019-02-02 15:45:26 +01:00

System Information
Operating system: Windows 10 x64
Graphics card: GTX 1080

Blender Version
Broken: blender-2.80.0-git.4ef09cf937f2-windows64

Short description of error
when I attach a generated normal map to the normal node of Principled BSDF, and when it was multipled too much, the mesh glows.

Exact steps for others to reproduce the error
see attached .blend file and the screenshot.

maybe that was my mistake but I have no idea why it happens,
anyways thank you so much.

bugged.blend

**System Information** Operating system: Windows 10 x64 Graphics card: GTX 1080 **Blender Version** Broken: blender-2.80.0-git.4ef09cf937f2-windows64 **Short description of error** when I attach a generated normal map to the normal node of Principled BSDF, and when it was multipled too much, the mesh glows. **Exact steps for others to reproduce the error** see attached .blend file and the screenshot. maybe that was my mistake but I have no idea why it happens, anyways thank you so much. [bugged.blend](https://archive.blender.org/developer/F6486010/bugged.blend) ![TIM截图20190202223757.jpg](https://archive.blender.org/developer/F6486013/TIM截图20190202223757.jpg)

Kevin Wang commented

2019-02-02 15:45:26 +01:00

Added subscriber: @kv516

Marco commented

2019-02-02 22:33:17 +01:00

Added subscriber: @nacioss

Marco commented

2019-02-02 22:33:17 +01:00

You can't use the math node between two vector type (purple color) nodes. That's why it doesn't work. If you need to multiply the strength of the bump, just place that multiply node in between the Noise Texture node and the Bump node.
In fact if you try to make the same thing in 2.79, then you have the same behaviour

You can't use the math node between two vector type (purple color) nodes. That's why it doesn't work. If you need to multiply the strength of the bump, just place that multiply node in between the Noise Texture node and the Bump node. In fact if you try to make the same thing in 2.79, then you have the same behaviour

William Reynish commented

2019-02-02 22:46:36 +01:00

Added subscriber: @WilliamReynish