/// <summary>
/// Parse a diffuse texture map in a .MTL file (a line of the kind "Map_Kd test.png").
/// </summary>
private void ParseMtlDiffuseTextureMapDeclaration()
{
// Check that a material declaration was started
if (currentLoadMaterial == null)
{
throw new InvalidObjMtlFileException(string.Format(
"{0}: Texture map declaration before starting a material.", mtlParser.GetFilePositionStr()));
}
// Check that the line contains a material name
mtlParser.AdvanceToNextNonWhiteSpace();
if (mtlParser.IsEndOfLine)
{
throw new InvalidObjMtlFileException(string.Format(
"{0}: Texture map declaration without a corresponding texture name.", mtlParser.GetFilePositionStr()));
}
// Load the associated texture
string textureFileName = mtlParser.ReadRestOfLine().Trim();
// Handle unsupported flags
if (textureFileName.StartsWith("-"))
{
string keyword = textureFileName.Substring(0, 2);
switch (keyword)
{
case "-o":
case "-s":
case "-t":
warningLog.Add(string.Format(
"{0}: Unrecognized map_kd keyword '{1}'.", mtlParser.GetFilePositionStr(), keyword));
// Assume format similar to "-s 5.000000 50.000000 1.000000 ..."
String[] split = textureFileName.Split(' ');
System.Text.StringBuilder newTextureFilename = new System.Text.StringBuilder();
for (int i = 4; i < split.Length; i++)
{
newTextureFilename.Append(split[i]);
if (i != split.Length - 1)
{
newTextureFilename.Append(' ');
}
}
textureFileName = newTextureFilename.ToString();
break;
}
}
string textureFilePath = Path.Combine(Path.GetDirectoryName(mtlPath), textureFileName);
// https://stackoverflow.com/a/8701748
Bitmap tempImage;
using (var bmpOnDisk = new Bitmap(textureFilePath))
{
tempImage = new Bitmap(bmpOnDisk);
}
currentLoadMaterial.DiffuseTextureMap = new Bitmap(tempImage);
}
/// <summary>
/// Load a .MTL file from the specified path.
/// </summary>
/// <param name="mtlPath">The path of the .MTL file.</param>
private void LoadMtl(string mtlPath)
{
this.mtlPath = mtlPath;
this.mtlParser = null;
this.materials = new Dictionary <string, ObjMtlMaterial>();
this.currentLoadMaterial = null;
using (mtlParser = new ObjMtlParser(mtlPath))
{
while (mtlParser.ReadNextLine())
{
// Check for empty and comment lines
if (!mtlParser.AdvanceToNextNonWhiteSpace())
{
continue;
}
if (mtlParser.PeekCharacter() == '#')
{
continue;
}
// Parse according to the keyword
string keyword = mtlParser.GetNextWord();
switch (keyword)
{
case "newmtl":
ParseMtlMaterialDeclaration();
break;
case "map_Kd":
ParseMtlDiffuseTextureMapDeclaration();
break;
default:
warningLog.Add(string.Format(
"{0}: Unrecognized keyword '{1}'.", mtlParser.GetFilePositionStr(), keyword));
break;
}
}
}
}
/// <summary>
/// Parse a diffuse texture map in a .MTL file (a line of the kind "Map_Kd test.png").
/// </summary>
private void ParseMtlDiffuseTextureMapDeclaration()
{
// Check that a material declaration was started
if (currentLoadMaterial == null)
{
throw new InvalidObjMtlFileException(string.Format(
"{0}: Texture map declaration before starting a material.", mtlParser.GetFilePositionStr()));
}
// Check that the line contains a material name
mtlParser.AdvanceToNextNonWhiteSpace();
if (mtlParser.IsEndOfLine)
{
throw new InvalidObjMtlFileException(string.Format(
"{0}: Texture map declaration without a corresponding texture name.", mtlParser.GetFilePositionStr()));
}
// Load the associated texture
string textureFileName = mtlParser.ReadRestOfLine().Trim();
string textureFilePath = Path.Combine(Path.GetDirectoryName(mtlPath), textureFileName);
currentLoadMaterial.DiffuseTextureMap = new Bitmap(textureFilePath);
}
/// <summary>
/// Load the model from the .OBJ file
/// </summary>
/// <param name="objPath">The path of a file containing the .OBJ file.</param>
/// <returns>A list of warnings while loading the file.</returns>
public List <string> LoadObj(string objPath)
{
if (objPath == null)
{
throw new ArgumentNullException("objPath");
}
// Set up the parser status to load a new .OBJ file
this.warningLog = new List <string>();
this.objPath = objPath;
this.objParser = null;
this.vertexPositions = new List <Vector3>();
this.vertexNormals = new List <Vector3>();
this.vertexTexCoords = new List <Vector2>();
this.currentObject = null;
this.currentMesh = null;
this.currentUsedMaterial = null;
this.mtlPath = null;
this.mtlParser = null;
this.materials = new Dictionary <string, ObjMtlMaterial>();
this.currentLoadMaterial = null;
using (objParser = new ObjMtlParser(objPath))
{
while (objParser.ReadNextLine())
{
// Check for empty and comment lines
if (!objParser.AdvanceToNextNonWhiteSpace())
{
continue;
}
if (objParser.PeekCharacter() == '#')
{
continue;
}
// Parse according to the keyword
string keyword = objParser.GetNextWord();
switch (keyword)
{
case "o":
ParseObjObjectDeclaration();
break;
case "mtllib":
ParseObjMtlLibDeclaration();
break;
case "usemtl":
ParseObjUseMtlDeclaration();
break;
case "v":
ParseObjVertexPositionDeclaration();
break;
case "vn":
ParseObjVertexNormalDeclaration();
break;
case "vt":
ParseObjVertexTexCoordDeclaration();
break;
case "f":
ParseObjFaceDeclaration();
break;
default:
warningLog.Add(string.Format(
"{0}: Unrecognized keyword '{1}'.", objParser.GetFilePositionStr(), keyword));
break;
}
}
}
return(warningLog);
}
/// <summary>
/// Load a .MTL file from the specified path.
/// </summary>
/// <param name="mtlPath">The path of the .MTL file.</param>
private void LoadMtl(string mtlPath)
{
this.mtlPath = mtlPath;
this.mtlParser = null;
this.materials = new Dictionary <string, ObjMtlMaterial>();
this.currentLoadMaterial = null;
using (mtlParser = new ObjMtlParser(mtlPath))
{
while (mtlParser.ReadNextLine())
{
// Check for empty and comment lines
if (!mtlParser.AdvanceToNextNonWhiteSpace())
{
continue;
}
if (mtlParser.PeekCharacter() == '#')
{
continue;
}
// Parse according to the keyword
string keyword = mtlParser.GetNextWord();
switch (keyword)
{
case "newmtl":
ParseMtlMaterialDeclaration();
break;
case "map_Kd":
ParseMtlDiffuseTextureMapDeclaration();
break;
case "d":
ParseMtlTransparencyDeclaration();
break;
case "Ka":
case "Kd":
case "Ks":
case "Ke":
case "Ni":
case "Ns":
case "illum":
break;
default:
warningLog.Add(string.Format(
"{0}: Unrecognized keyword '{1}'.", mtlParser.GetFilePositionStr(), keyword));
break;
}
}
// Check for untextured materials
foreach (KeyValuePair <string, ObjMtlMaterial> objectMaterial in materials)
{
if (objectMaterial.Value.DiffuseTextureMap == null)
{
warningLog.Add(string.Format(
"Material name \"{0}\": No texture associated with the material.", objectMaterial.Key));
}
}
}
}
