void ImportMaterialLibraries(ObjLine materialLine, BabylonScene scene)
{
for (int i = 1; i < materialLine.Tokens.Length; i++)
{
string fileName = materialLine.Tokens[i];
var mtlDocument = new Document<MtlLine>(File.ReadAllText(fileName));
StandardMaterial currentMaterial = null;
foreach (var lines in mtlDocument.Blocks)
{
foreach (MtlLine line in lines)
{
switch (line.Header)
{
case MtlHeader.Material:
currentMaterial = new StandardMaterial(line.Tokens[1]);
currentMaterial.BackFaceCulling = false;
materials.Add(currentMaterial);
break;
case MtlHeader.DiffuseColor:
currentMaterial.Diffuse = line.ToColor();
break;
case MtlHeader.DiffuseTexture:
currentMaterial.Diffuse = new Color3(1, 1, 1);
currentMaterial.DiffuseTexture = line.Tokens[1].Replace("//", @"\");
break;
case MtlHeader.Alpha:
currentMaterial.Alpha = line.ToFloat();
break;
case MtlHeader.EmissiveColor:
currentMaterial.Emissive = line.ToColor();
break;
case MtlHeader.SpecularColor:
currentMaterial.Specular = line.ToColor();
break;
case MtlHeader.SpecularPower:
currentMaterial.SpecularPower = line.ToFloat();
break;
}
}
}
}
foreach (var material in materials)
{
material.CreateBabylonMaterial(scene);
}
}
void AppendIndex(int index, ObjLine line)
{
string[] indices = line.Tokens[index].Split('/');
// Required: Position
int positionIndex = int.Parse(indices[0], CultureInfo.InvariantCulture) - positionsIndexOffset;
int texCoordIndex = -1;
int normalIndex = -1;
// Optional: Texture coordinate
if (indices.Length > 1 && indices[1].Equals(string.Empty) == false)
{
texCoordIndex = int.Parse(indices[1]) - textureCoordinatesIndexOffset;
}
// Optional: Normal
if (indices.Length > 2 && indices[2].Equals(string.Empty) == false)
{
normalIndex = int.Parse(indices[2]) - normalsIndexOffset;
}
// Build vertex
var vertex = new PositionNormalTextured { Position = positions[positionIndex] };
if (texCoordIndex >= 0)
vertex.TextureCoordinates = textureCoordinates[texCoordIndex];
if (normalIndex >= 0)
vertex.Normal = normals[normalIndex];
// check if the vertex does not already exists
string hash = vertex.ToString();
int vertexIndex;
if (!registeredVertices.TryGetValue(hash, out vertexIndex))
{
stagingVertices.Add(vertex);
vertexIndex = stagingVertices.Count - 1;
registeredVertices.Add(hash, vertexIndex);
}
stagingIndices.Add(vertexIndex);
}
void AppendFace(ObjLine line)
{
// Line
if (line.Tokens.Length == 3)
{
AppendIndex(1, line);
AppendIndex(2, line);
AppendIndex(2, line);
return;
}
// Triangle
if (line.Tokens.Length == 4)
{
for (int index = 1; index <= 3; index++)
{
AppendIndex(index, line);
}
return;
}
// Quad
if (line.Tokens.Length == 5)
{
for (int index = 1; index <= 3; index++)
{
AppendIndex(index, line);
}
AppendIndex(1, line);
AppendIndex(3, line);
AppendIndex(4, line);
}
}