/// <summary>
/// Converts "Necessary" textures textures found in the gltf file.
/// Coroutine must be fully consumed before generating materials.
/// </summary>
/// <seealso cref="GltfMaterialConverter.NecessaryTextures" />
/// <param name="root">The root of the GLTF file.</param>
/// <param name="loader">The loader to use to load resources (textures, etc).</param>
/// <param name="loaded">Mutated to add any textures that were loaded.</param>
public static IEnumerable LoadTexturesCoroutine(
GltfRootBase root, IUriLoader loader, List <Texture2D> loaded)
{
foreach (GltfTextureBase gltfTexture in NecessaryTextures(root))
{
if (IsTiltBrushHostedUri(gltfTexture.SourcePtr.uri))
{
Debug.LogWarningFormat("Texture {0} uri {1} was considered necessary",
gltfTexture.GltfId, gltfTexture.SourcePtr.uri);
continue;
}
foreach (var unused in ConvertTextureCoroutine(gltfTexture, loader))
{
yield return(null);
}
if (gltfTexture.unityTexture != null)
{
loaded.Add(gltfTexture.unityTexture);
}
}
// After textures are converted, we don't need the cached RawImage data any more.
// "Deallocate" it.
foreach (GltfImageBase image in root.Images)
{
image.data = null;
}
}
/// <summary>
/// Enumerates those Textures associated with local materials, as distinguished
/// from well-known, global materials like BlocksPaper and Tilt Brush Light.
/// Textures associated with those latter materials will not be enumerated.
///
/// These are the textures that need UnityEngine.Textures created for them.
/// </summary>
public static IEnumerable <GltfTextureBase> NecessaryTextures(GltfRootBase root)
{
foreach (var mat in root.Materials)
{
if (!IsGlobalMaterial(mat))
{
foreach (var tex in mat.ReferencedTextures)
{
yield return(tex);
}
}
}
}