Material

• https://github.com/ousttrue/UniGLTF/issues/12
• https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#reference-material
• https://github.com/KhronosGroup/glTF/blob/master/extensions/2.0/Khronos/KHR_materials_unlit/README.md

✅ Color

GLTF	Unity
/materials/*/pbrMetallicRoughness/baseColorFactor	material.color	shorthand of material.SetColor("_Color", color)
/materials/*/pbrMetallicRoughness/baseColorTexture	material.mainTexture	shorthand of material.SetTexture("_MainTex", texture)

[ ] NormalMap

[ ] Occlusion

[ ] Emission

✅ Alpha

Unity RenderType Tag	glTFのmaterial.alphaModeプロパティ
Opaque	OPAQUE (デフォルトなので出力は不要)
Transparent	BLEND
TransparentCutout	MASK

[ ] DoubleSided=true

Require custom shader

[ ] VertexColor

Require custom shader

✅ Shader selector for KHR_material_unlit

baseColorFactor	baseColorTexture	alpha mode	Unity shader
o		OPAQUE	Unlit/Color
	o	OPAQUE	Unlit/Texture
o	o	OPAQUE	require custom shader
o		BLEND	require custom shader
	o	BLEND	Unlit/Transparent
o	o	BLEND	require custom shader
o		CUTOUT	----
	o	CUTOUT	Unlit/Transparent Cutout
o	o	CUTOUT	require custom shader

✅ Default params of KHR_material_unlit

• https://github.com/KhronosGroup/glTF/blob/master/extensions/2.0/Khronos/KHR_materials_unlit/README.md#extension-compatibility-and-fallback-materials

• https://github.com/ousttrue/UniGLTF/blob/8516dab5532d72d43a2d61995363814c63a83c17/Core/Scripts/Format/ExtensionsAndExtras/KHR_materials_unlit.cs#L14