// Pass:
// parameterName -
// used for the FbxTexture name. Can be something arbitrary since as far as I know,
// the texture node's name is unused by importers.
private static void AddTextureToMaterial(
FbxExportGlobals G,
ExportFileReference fileRef,
FbxSurfaceLambert fbxMaterial,
string parameterName)
{
Debug.Assert(File.Exists(fileRef.m_originalLocation));
var destPath = Path.Combine(G.m_outputDir, fileRef.m_uri);
if (!File.Exists(destPath))
{
if (!FileUtils.InitializeDirectoryWithUserError(Path.GetDirectoryName(destPath)))
{
return;
}
File.Copy(fileRef.m_originalLocation, destPath);
}
// It's kind of weird that the parameter name is used for the texture node's name,
// but as far as I can tell nobody cares about that name, so whatever.
FbxFileTexture fbxTexture = FbxFileTexture.Create(G.m_scene, parameterName);
fbxTexture.SetFileName(destPath);
fbxTexture.SetTextureUse(FbxTexture.ETextureUse.eStandard);
fbxTexture.SetMappingType(FbxTexture.EMappingType.eUV);
fbxTexture.SetMaterialUse(FbxFileTexture.EMaterialUse.eModelMaterial);
fbxTexture.UVSet.Set(new FbxString("uv0"));
// It's also weird that we only ever assign to the Diffuse slot.
// Shouldn't we be looking at the parameter name and assigning to Diffuse, Normal, etc
// based on what we see?
// TODO: check
fbxMaterial.Diffuse.ConnectSrcObject(fbxTexture);
fbxMaterial.TransparentColor.ConnectSrcObject(fbxTexture);
}
internal static FbxSurfaceMaterial CreateFbxMaterial(
FbxExportGlobals G, string meshNamespace, IExportableMaterial exportableMaterial,
HashSet <string> createdMaterialNames)
{
string materialName;
if (exportableMaterial is BrushDescriptor)
{
// Toolkit uses this guid (in "N" format) to look up a BrushDescriptor.
// See Toolkit's ModelImportSettings.GetDescriptorForStroke
materialName = $"{exportableMaterial.UniqueName:N}_{meshNamespace}_{exportableMaterial.DurableName}";
}
else if (exportableMaterial is DynamicExportableMaterial dem)
{
// Comes from {fbx,obj,gltf,...} import from {Poly, Media Library}
// This is a customized version of a BrushDescriptor -- almost certainly
// Pbr{Blend,Opaque}{Double,Single}Sided with maybe an added texture and
// some of its params customized.
// TBT will merge the material created by Unity for this FbxMaterial with
// the premade material it has for the parent guid.
materialName = $"{dem.Parent.m_Guid:N}_{meshNamespace}_{dem.DurableName}";
}
else
{
Debug.LogWarning($"Unknown class {exportableMaterial.GetType().Name}");
materialName = $"{meshNamespace}_{exportableMaterial.DurableName}";
}
// If only ExportFbx were a non-static class we could merge it with FbxExportGlobals
materialName = ExportUtils.CreateUniqueName(materialName, createdMaterialNames);
FbxSurfaceLambert material = FbxSurfaceLambert.Create(G.m_scene, materialName);
material.Ambient.Set(new FbxDouble3(0, 0, 0));
material.Diffuse.Set(new FbxDouble3(1.0, 1.0, 1.0));
if (exportableMaterial.EmissiveFactor > 0)
{
material.EmissiveFactor.Set(exportableMaterial.EmissiveFactor);
material.Emissive.Set(new FbxDouble3(1.0, 1.0, 1.0));
}
if (exportableMaterial.BlendMode != ExportableMaterialBlendMode.None)
{
var blendMode = FbxProperty.Create(material, Globals.FbxStringDT, "BlendMode");
switch (exportableMaterial.BlendMode)
{
case ExportableMaterialBlendMode.AlphaMask:
blendMode.SetString(new FbxString("AlphaMask"));
material.TransparencyFactor.Set(0.2);
break;
case ExportableMaterialBlendMode.AdditiveBlend:
blendMode.SetString(new FbxString("AdditiveBlend"));
break;
}
}
// Export the texture
if (exportableMaterial.HasExportTexture())
{
// This is not perfectly unique, but it is good enough for fbx export
// better would be to use <durable>_<guid> but that's ugly, and nobody uses
// the textures anyway, so... let's leave well enough alone for now.
string albedoTextureName = exportableMaterial.DurableName;
var fullTextureDir = Path.Combine(G.m_outputDir, kRelativeTextureDir);
if (!Directory.Exists(fullTextureDir))
{
if (!FileUtils.InitializeDirectoryWithUserError(fullTextureDir))
{
throw new IOException("Cannot write textures");
}
}
string src = exportableMaterial.GetExportTextureFilename();
var textureFileName = albedoTextureName + ".png";
var textureFilePath = Path.Combine(fullTextureDir, textureFileName);
FileInfo srcInfo = new FileInfo(src);
if (srcInfo.Exists && !new FileInfo(textureFilePath).Exists)
{
srcInfo.CopyTo(textureFilePath);
}
FbxFileTexture texture = FbxFileTexture.Create(G.m_scene, albedoTextureName + "_texture");
texture.SetFileName(textureFilePath);
texture.SetTextureUse(FbxTexture.ETextureUse.eStandard);
texture.SetMappingType(FbxTexture.EMappingType.eUV);
texture.SetMaterialUse(FbxFileTexture.EMaterialUse.eModelMaterial);
texture.UVSet.Set(new FbxString("uv0"));
material.Diffuse.ConnectSrcObject(texture);
material.TransparentColor.ConnectSrcObject(texture);
}
else
{
foreach (var kvp in exportableMaterial.TextureUris)
{
string parameterName = kvp.Key;
string textureUri = kvp.Value;
if (ExportFileReference.IsHttp(textureUri))
{
// fbx can't deal with http references to textures
continue;
}
ExportFileReference fileRef = ExportFileReference.GetOrCreateSafeLocal(
G.m_disambiguationContext, textureUri, exportableMaterial.UriBase,
$"{meshNamespace}_{Path.GetFileName(textureUri)}");
AddTextureToMaterial(G, fileRef, material, parameterName);
}
}
return(material);
}