When a KHR_materials_common had the CONSTANT technique, then the resulting PBR material did not contain a base color texture, because the CONSTANT technique did not support diffuse textures. However, it could contain ambient or emissive textures. With the change here, the conversion will try to assign the ambient- or emissive texture as the base color texture when the CONSTANT technique is used.
Addresses https://github.com/CesiumGS/cesium/issues/11821 May replace https://github.com/CesiumGS/gltf-pipeline/pull/654
When a
KHR_materials_commonhad theCONSTANTtechnique, then the resulting PBR material did not contain a base color texture, because theCONSTANTtechnique did not support diffuse textures. However, it could contain ambient or emissive textures. With the change here, the conversion will try to assign the ambient- or emissive texture as the base color texture when theCONSTANTtechnique is used.