static void ExportUnlit(Material material, UnityEngine.Material uMaterial, IGltfWritable gltf, ICodeLogger logger)
{
gltf.RegisterExtensionUsage(Extension.MaterialsUnlit);
material.extensions = material.extensions ?? new MaterialExtension();
material.extensions.KHR_materials_unlit = new MaterialUnlit();
var pbr = material.pbrMetallicRoughness ?? new PbrMetallicRoughness();
if (uMaterial.HasProperty(k_Color))
{
pbr.baseColor = uMaterial.GetColor(k_Color);
}
if (uMaterial.HasProperty(k_MainTex))
{
var mainTex = uMaterial.GetTexture(k_MainTex);
if (mainTex != null)
{
if (mainTex is Texture2D)
{
pbr.baseColorTexture = ExportTextureInfo(mainTex, TextureMapType.Main, gltf);
ExportTextureTransform(pbr.baseColorTexture, uMaterial, k_MainTex, gltf);
}
else
{
logger?.Error(LogCode.TextureInvalidType, "main", material.name);
}
}
}
material.pbrMetallicRoughness = pbr;
}
static void ExportTextureTransform(TextureInfo def, UnityEngine.Material mat, int texPropertyId, IGltfWritable gltf)
{
var offset = mat.GetTextureOffset(texPropertyId);
var scale = mat.GetTextureScale(texPropertyId);
// Counter measure for Unity/glTF texture coordinate difference
// TODO: Offer UV conversion as alternative
offset.y = 1 - offset.x;
scale.y *= -1;
if (offset != Vector2.zero || scale != Vector2.one)
{
gltf.RegisterExtensionUsage(Extension.TextureTransform);
def.extensions = def.extensions ?? new TextureInfoExtension();
def.extensions.KHR_texture_transform = new TextureTransform {
scale = new[] { scale.x, scale.y },
offset = new[] { offset.x, offset.y }
};
}
}