/// <summary>
/// Exports the given model to the given output stream.
/// </summary>
/// <param name="filename">Name of the model.</param>
/// <param name="scene">The model to output.</param>
/// <param name="baseoutstream">The stream to output to.</param>
/// <returns>The texture output data.</returns>
static string ExportModelData(string filename, Scene scene, Stream baseoutstream)
{
baseoutstream.WriteByte((byte)'F');
baseoutstream.WriteByte((byte)'M');
baseoutstream.WriteByte((byte)'D');
baseoutstream.WriteByte((byte)'0');
baseoutstream.WriteByte((byte)'0');
baseoutstream.WriteByte((byte)'1');
MemoryStream outputStreamInternal = new MemoryStream();
StreamWrapper outstream = new StreamWrapper(outputStreamInternal);
outstream.WriteMatrix4x4(scene.RootNode.Transform);
outstream.WriteInt(scene.MeshCount);
Console.WriteLine($"Writing {scene.MeshCount} meshes...");
StringBuilder textureFileBuilder = new StringBuilder();
textureFileBuilder.Append($"model={filename}\n");
for (int meshId = 0; meshId < scene.MeshCount; meshId++)
{
Mesh mesh = scene.Meshes[meshId];
Console.WriteLine($"Writing mesh: {mesh.Name}");
string nodeName = mesh.Name.ToLower().Replace('#', '_').Replace('.', '_');
if (PreTransformNode && GetNode(scene.RootNode, nodeName) == null)
{
Console.WriteLine($"NO NODE FOR: {nodeName}");
continue;
}
Matrix4x4 transformMatrix = PreTransformNode ? GetNode(scene.RootNode, nodeName).Transform *scene.RootNode.Transform : Matrix4x4.Identity;
if (UseModelTexture)
{
Material mater = scene.Materials[mesh.MaterialIndex];
if (mater.HasTextureDiffuse)
{
textureFileBuilder.Append($"{mesh.Name}={mater.TextureDiffuse.FilePath}\n");
}
if (mater.HasTextureSpecular)
{
textureFileBuilder.Append($"{mesh.Name}:::specular={scene.Materials[mesh.MaterialIndex].TextureSpecular.FilePath}\n");
}
if (mater.HasTextureReflection)
{
textureFileBuilder.Append($"{mesh.Name}:::reflectivity={scene.Materials[mesh.MaterialIndex].TextureReflection.FilePath}\n");
}
if (mater.HasTextureNormal)
{
textureFileBuilder.Append($"{mesh.Name}:::normal={scene.Materials[mesh.MaterialIndex].TextureNormal.FilePath}\n");
}
}
else
{
textureFileBuilder.Append($"{mesh.Name}=UNKNOWN\n");
}
outstream.WriteStringProper(mesh.Name);
outstream.WriteInt(mesh.VertexCount);
for (int v = 0; v < mesh.VertexCount; v++)
{
outstream.WriteVector3D(transformMatrix * mesh.Vertices[v]);
}
outstream.WriteInt(mesh.FaceCount);
for (int f = 0; f < mesh.FaceCount; f++)
{
Face face = mesh.Faces[f];
outstream.WriteInt(face.Indices[0]);
outstream.WriteInt(face.Indices[face.IndexCount > 1 ? 1 : 0]);
outstream.WriteInt(face.Indices[face.IndexCount > 2 ? 2 : 0]);
}
outstream.WriteInt(mesh.TextureCoordinateChannels[0].Count);
for (int t = 0; t < mesh.TextureCoordinateChannels[0].Count; t++)
{
outstream.WriteFloat(mesh.TextureCoordinateChannels[0][t].X);
outstream.WriteFloat(mesh.TextureCoordinateChannels[0][t].Y);
}
outstream.WriteInt(mesh.Normals.Count);
Matrix4x4 normalMatrixRaw = transformMatrix;
normalMatrixRaw.Inverse();
normalMatrixRaw.Transpose();
Matrix3x3 normalMatrix3 = new Matrix3x3(normalMatrixRaw);
for (int n = 0; n < mesh.Normals.Count; n++)
{
outstream.WriteVector3D(normalMatrix3 * mesh.Normals[n]);
}
outstream.WriteInt(mesh.BoneCount);
for (int b = 0; b < mesh.BoneCount; b++)
{
Bone bone = mesh.Bones[b];
outstream.WriteStringProper(bone.Name);
outstream.WriteInt(bone.VertexWeightCount);
for (int v = 0; v < bone.VertexWeightCount; v++)
{
outstream.WriteInt(bone.VertexWeights[v].VertexID);
outstream.WriteFloat(bone.VertexWeights[v].Weight);
}
outstream.WriteMatrix4x4(bone.OffsetMatrix);
}
}
OutputNode(scene.RootNode, outstream);
byte[] outputBytesRaw = outputStreamInternal.ToArray();
outputBytesRaw = GZip(outputBytesRaw);
baseoutstream.Write(outputBytesRaw, 0, outputBytesRaw.Length);
return(textureFileBuilder.ToString());
}
