PetrTT

Results 3 issues of PetrTT

Win 10 LuxCoreRender latest build Blender 2.93 GTX 1070 [Test_01.zip](https://github.com/LuxCoreRender/LuxCore/files/7104446/Test_01.zip) ![003](https://user-images.githubusercontent.com/20154959/131976619-b6d91f72-befd-43d3-816e-161257f6a6e2.png) Render on GPU has artifacts when mesh have ngons.

Win10 LuxCoreRender last build Blender 2.93 GTX 1070 ![pic](https://user-images.githubusercontent.com/20154959/131974335-6f284158-3c41-4fe7-89d6-13d805f75547.png) Metal shader violet border.Strange behavior of metal shader [Test.zip](https://github.com/LuxCoreRender/LuxCore/files/7104394/Test.zip)

#### System Information Win 7 gtx 1070 #### Software Version * Blender version: (example: 2.79, see splash screen) * LuxCore version: daily build 2.2 beta 2 1 Material Preview In...