import glbs

[tigrazone]

I'm importing glb to another raytracer and glass not imported ok. how to support these glass? can you change scene with extra: "glass"?

For luxball scene I find in code https://github.com/gameknife/gkNextRenderer/blob/b90eb1324c4d8c98cece9128641ad0f1c388fc24/src/Assets/Model.cpp#L245-L248 and do in my renderer code

    if(tmat.extras.Has("glass"))
    {
      gmat.ior.ior = 1.46f;
      gmat.transmission.factor = 1.0f;
    }

[tigrazone]

maybe is more correct way is set ior and transmissionFactor? https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_ior/README.md https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_transmission/README.md

[gameknife]

my source scene is edit in blender, I will check if it can export ior and transmission

[gameknife]

updated three glb to export ior & transmission, and update the model.cpp

[tigrazone]

Thank you!

[tigrazone]

For which purposes you plan to use RefractionIndex2? Why not RefractionIndex?

[gameknife]

For which purposes you plan to use RefractionIndex2? Why not RefractionIndex?

specific for qx50 scene, the car glass is single layered, ior2 make the refraction ray pass through directly~ a trick, with extra

[tigrazone]

looks like thinwalled https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_volume/README.md thicknessFactor

  // Thin film approximation
  if(mat.thicknessFactor == 0.0F && mat.roughness > 0.0F)
  {
    refractedDir = sampleThinTransmission(data, mat);
  }
  else
  {
    refractedDir = sampleSolidTransmission(data, mat, refracted);
  }

https://github.com/nvpro-samples/nvpro_core/blob/a3990a04a9769f3bc6b59a915b0078c32e786d34/nvvkhl/shaders/bsdf_functions.h#L197-204

[tigrazone]

better way to set bool thinWalled = material.thicknessFactor < 0.011; because precission issues and I rewrite in by fork repo if(mat.thinWalled && mat.roughness > 0.0F)

[tigrazone]

maybe dielectrics works wrong. because when I just open qx50.glb and start to render by https://github.com/nvpro-samples/vk_shaded_gltfscene and glass rendered w/o issues.

I use previous version of vk_shaded_gltfscene and nvpro_core bacause new version have issues

[tigrazone]

kitchen scene has strange glass material