static void Export_TextureTransform(Material m, glTFTextureInfo textureInfo, string propertyName)
{
if (textureInfo != null && m.HasProperty(propertyName))
{
var offset = m.GetTextureOffset(propertyName);
var scale = m.GetTextureScale(propertyName);
offset.y = (offset.y + scale.y - 1) * -1.0f;
textureInfo.extensions = new glTFTextureInfo_extensions
{
KHR_texture_transform = new glTF_KHR_texture_transform()
{
offset = new float[] { offset.x, offset.y },
scale = new float[] { scale.x, scale.y },
}
};
}
}
private static void SetTextureOffsetAndScale(Material material, glTFTextureInfo textureInfo, string propertyName)
{
if (textureInfo.extensions != null && textureInfo.extensions.KHR_texture_transform != null)
{
var textureTransform = textureInfo.extensions.KHR_texture_transform;
Vector2 offset = new Vector2(0, 0);
Vector2 scale = new Vector2(1, 1);
if (textureTransform.offset != null && textureTransform.offset.Length == 2)
{
offset = new Vector2(textureTransform.offset[0], textureTransform.offset[1]);
}
if (textureTransform.scale != null && textureTransform.scale.Length == 2)
{
scale = new Vector2(textureTransform.scale[0], textureTransform.scale[1]);
}
offset.y = (offset.y + scale.y - 1.0f) * -1.0f;
material.SetTextureOffset(propertyName, offset);
material.SetTextureScale(propertyName, scale);
}
}
static void Export_MainTextureTransform(Material m, glTFTextureInfo textureInfo)
{
Export_TextureTransform(m, textureInfo, "_MainTex");
}