/// <summary>
/// Add the KHR_texture_transform to the glTF file
/// </summary>
/// <param name="gltf"></param>
/// <param name="babylonMaterial"></param>
private void AddTextureTransformExtension(ref GLTF gltf, ref GLTFTextureInfo gltfTextureInfo, BabylonTexture babylonTexture)
{
if (!gltf.extensionsUsed.Contains(KHR_texture_transform))
{
gltf.extensionsUsed.Add(KHR_texture_transform);
}
if (!gltf.extensionsRequired.Contains(KHR_texture_transform))
{
gltf.extensionsRequired.Add(KHR_texture_transform);
}
float angle = babylonTexture.wAng;
float angleDirect = -babylonTexture.wAng;
KHR_texture_transform textureTransform = new KHR_texture_transform
{
offset = new float[] { babylonTexture.uOffset, -babylonTexture.vOffset },
rotation = angle,
scale = new float[] { babylonTexture.uScale, -babylonTexture.vScale },
texCoord = babylonTexture.coordinatesIndex
};
if (gltfTextureInfo.extensions == null)
{
gltfTextureInfo.extensions = new GLTFExtensions();
}
gltfTextureInfo.extensions[KHR_texture_transform] = textureTransform;
}
/// <summary>
/// Add the KHR_texture_transform to the glTF file
/// </summary>
/// <param name="gltf"></param>
/// <param name="babylonMaterial"></param>
private void AddTextureTransformExtension(ref GLTF gltf, ref GLTFTextureInfo gltfTextureInfo, BabylonTexture babylonTexture)
{
if (gltf.extensionsUsed.Contains(KHR_texture_transform) == false)
{
gltf.extensionsUsed.Add(KHR_texture_transform);
}
float angle = babylonTexture.wAng;
float angleDirect = -babylonTexture.wAng;
KHR_texture_transform textureTransform = new KHR_texture_transform
{
offset = new float[] { babylonTexture.uOffset, -babylonTexture.vOffset },
rotation = angle,
scale = new float[] { babylonTexture.uScale, babylonTexture.vScale },
texCoord = babylonTexture.coordinatesIndex
};
textureTransform.offset[1] += 1 - babylonTexture.vScale; // update vOffset according to the vScale
textureTransform.offset[0] += (float)(0.5 * (1 - (Math.Cos(angleDirect) - Math.Sin(angleDirect)))); // update uOffset according to the rotation
textureTransform.offset[1] += (float)(0.5 * (1 - (Math.Sin(angleDirect) + Math.Cos(angleDirect)))); // update vOffset according to the rotation
if (gltfTextureInfo.extensions == null)
{
gltfTextureInfo.extensions = new GLTFExtensions();
}
gltfTextureInfo.extensions[KHR_texture_transform] = textureTransform;
}
private string TextureTransformID(GLTFTextureInfo gltfTextureInfo)
{
if (gltfTextureInfo.extensions == null || !gltfTextureInfo.extensions.ContainsKey(KHR_texture_transform))
{
return("");
}
else
{
// Set an id for the texture transform and append to the name
KHR_texture_transform textureTransform = gltfTextureInfo.extensions[GLTFExporter.KHR_texture_transform] as KHR_texture_transform;
var offsetID = textureTransform.offset[0] + "_" + textureTransform.offset[1];
var rotationID = textureTransform.rotation.ToString();
var scaleID = textureTransform.scale[0] + "_" + textureTransform.scale[1];
var textureTransformID = offsetID + "_" + rotationID + "_" + scaleID;
return(textureTransformID);
}
}