MetallicRoughnessOcclusion テクスチャーの取り廻しを中心に改修

[ousttrue]

• Imports with UniGLTF 1.28 look less like Blender equivalent than 1.27 #388 glTF(roughness) と unity(smoothness) の変換を修正
• Combine PBR textures into one #781 imoport時に(metallic,roughness,occlusion)を1枚にまとめる。export時に(metallic,smoothness,occlusion)を１枚にまとめる
• TextureExport 周りのコードを単純化(inteface や継承をやめて、 static class, static 関数を増やした)

// GLTF
        {
            "pbrMetallicRoughness": {
                "baseColorTexture": {
                    "index": 11
                },
                "metallicRoughnessTexture": {
                    "index": 10
                }
            },
            "normalTexture": {
                "index": 9
            },
            "occlusionTexture": {
                "index": 10
            },
            "name": "LeatherPartsMat"
        },

// unity(smoothness) <= gltf(rougheness)
pixel(unity) = 1 - pixel(gltf) * factor(gltf)
factor(unity) = 1

// gltf(roughness) <= unity(smoothness)
pixel(gltf) = 1 - pixel(unity) * factor(unity)
factor(gltf) = 1

[ousttrue]

check

https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/MetalRoughSpheres

[ousttrue]

Exported and imported immediately

[Santarh]

さすがにデカすぎて見きれませんが、ちゃんと動いているならヨシということで…