public MaterialInfoWithFaces(SSWavefrontMTLInfo sourceMtl)
{
mtl = sourceMtl;
}
/// <summary>
/// This method is used to load information stored in .mtl files referenced by the .obj file.
/// </summary>
/// <param name="d3ddevice"></param>
/// <param name="file"></param>
private void parseOBJ(SSAssetManager.Context ctx, string filename)
{
MaterialInfoWithFaces currentMaterial = null;
StreamReader sr = ctx.OpenText(filename);
//Read the first line of text
string line = sr.ReadLine();
//Continue to read until you reach end of file
while (line != null)
{
string[] tokens = line.Split(" ".ToArray(), 2);
if (tokens.Length < 2)
{
goto next_line;
}
string firstToken = tokens[0];
string lineContent = tokens[1];
switch (firstToken)
{
case "#": // Nothing to read, these are comments.
break;
case "v": // Vertex position
positions.Add(WavefrontParser.readVector4(lineContent, null));
break;
case "vn": // vertex normal direction vector
normals.Add(WavefrontParser.readVector3(lineContent, null));
break;
case "vt": // Vertex texcoordinate
texCoords.Add(WavefrontParser.readVector2(lineContent, null));
break;
case "f": // Face
string[] values = WavefrontParser.FilteredSplit(lineContent, null);
int numPoints = values.Length;
Face face = new Face();
face.v_idx = new Int16[numPoints];
face.n_idx = new Int16[numPoints];
face.tex_idx = new Int16[numPoints]; // todo: how do outside clients know if there were texcoords or not?!?!
for (int i = 0; i < numPoints; i++)
{
// format is "loc_index[/tex_index[/normal_index]]" e.g. 3 ; 3/2 ; 3/2/5
// but middle part can me empty, e.g. 3//5
string[] indexes = values[i].Split('/');
int iPosition = (int.Parse(indexes[0]) - 1); // adjust 1-based index
if (iPosition < 0)
{
iPosition += positions.Count + 1;
} // adjust negative indicies
face.v_idx[i] = (Int16)iPosition;
numIndices++;
// initialize other indicies to not provided, in case they are missing
face.n_idx[i] = -1;
face.tex_idx[i] = -1;
if (indexes.Length > 1)
{
string tex_index = indexes[1];
if (tex_index != "")
{
int iTexCoord = int.Parse(tex_index) - 1; // adjust 1-based index
if (iTexCoord < 0)
{
iTexCoord += texCoords.Count + 1;
} // adjust negative indicies
face.tex_idx[i] = (Int16)iTexCoord;
}
if (indexes.Length > 2)
{
hasNormals = true;
int iNormal = int.Parse(indexes[2]) - 1; // adjust 1 based index
if (iNormal < 0)
{
iNormal += normals.Count + 1;
} // adjust negative indicies
face.n_idx[i] = (Int16)iNormal;
}
}
}
if (currentMaterial == null)
{
// no material in file, so create one
currentMaterial = createImplicitMaterial();
}
currentMaterial.faces.Add(face);
currentMaterial.nbrIndices += face.v_idx.Length;
numFaces++;
break;
case "mtllib": // load named material file
string mtlFile = lineContent;
{
var mtls = SSWavefrontMTLInfo.ReadMTLs(ctx, mtlFile);
foreach (var mtl in mtls)
{
materials.Add(new MaterialInfoWithFaces(mtl));
}
}
break;
case "usemtl": // use named material (from material file previously loaded)
bool found = false;
string matName = lineContent;
for (int i = 0; i < materials.Count; i++)
{
if (matName.Equals(materials[i].mtl.name))
{
found = true;
currentMaterial = materials[i];
}
}
if (!found)
{
throw new WavefrontObjParseException("Materials are already loaded so we should have it!");
}
break;
}
next_line:
//Read the next line
line = sr.ReadLine();
}
//close the file
sr.Close();
}
