Detlef Roettger

VirtualCity model is not defining any lights and is closed by a single-sided dome

2

The [VirtualCity](https://github.com/KhronosGroup/glTF-Sample-Assets/blob/main/Models/VirtualCity/glTF/VirtualCity.gltf) model will look completely black in a global illumination renderer because none of the materials define any emission and the city is enclosed by a single-sided dome geometry....

Visualizing the world space shading normals inside the [TransmissionThinwallTestGrid.gltf](https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/TransmissionThinwallTestGrid) model shows that all font geometry has normals which are not consistent with the background planes behind them (color = N...

Visualizing the world space geometry or shading normals on the face-culled geometry of the [DirectionalLight.gltf](https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/DirectionalLight) shows that they are pointing to the inside (here: color = N * 0.5f +...

KHR_materials_clearcoat Fresnel should not influence material emission

4

> The clearcoat layer is on top of emission in the layering stack. Consequently, the emission is darkened by the Fresnel term. >coated_emission = emission * (0.04 + (1 -...

The model [MorphPrimitivesTest.gltf](https://github.com/KhronosGroup/glTF-Sample-Assets/blob/main/Models/MorphPrimitivesTest/glTF/MorphPrimitivesTest.gltf) provides position, normal, and texcoord0 attributes but only morphs positions. As consequence the morphed mesh uses normals of the flat mesh with all normals pointing to (0,1,0)...