/// <summary>
/// Creates a Triangle as specified. Vertices must be CCW
/// </summary>
/// <param name="vertex1"></param>
/// <param name="texel1"></param>
/// <param name="normal1"></param>
/// <param name="vertex2"></param>
/// <param name="texel2"></param>
/// <param name="normal2"></param>
/// <param name="vertex3"></param>
/// <param name="texel3"></param>
/// <param name="normal3"></param>
/// <param name="material"></param> The texture for this Triangle
public Triangle(int vertex1, int texel1, int normal1, int vertex2, int texel2, int normal2, int vertex3, int texel3, int normal3, Material material)
{
this.vertex1 = vertex1;
this.vertex2 = vertex2;
this.vertex3 = vertex3;
this.texel1 = texel1;
this.texel2 = texel2;
this.texel3 = texel3;
this.normal1 = normal1;
this.normal2 = normal2;
this.normal3 = normal3;
Debug.Assert(normal1 == normal2);
Debug.Assert(normal1 == normal3);
this.material = material;
}
/// <summary>
/// Creates a Triangle as specified
/// </summary>
/// <param name="vertex1">A string in the format "vertex/texture/normal". These index into the vertex, texture, and normal array</param>
/// <param name="vertex2">A string in the format "vertex/texture/normal". These index into the vertex, texture, and normal array</param>
/// <param name="vertex3">A string in the format "vertex/texture/normal". These index into the vertex, texture, and normal array</param>
/// <param name="material">A Material that will be the texture for this Triangle</param>
public Triangle(string vertex1, string vertex2, string vertex3, Material material)
{
// vertex/texture/normal
string[] firstVertex = vertex1.Split('/');
string[] secondVertex = vertex2.Split('/');
string[] thirdVertex = vertex3.Split('/');
this.vertex1 = Convert.ToInt32(firstVertex[0]);
this.texel1 = Convert.ToInt32(firstVertex[1]);
this.normal1 = Convert.ToInt32(firstVertex[2]);
this.vertex2 = Convert.ToInt32(secondVertex[0]);
this.texel2 = Convert.ToInt32(secondVertex[1]);
this.normal2 = Convert.ToInt32(secondVertex[2]);
this.vertex3 = Convert.ToInt32(thirdVertex[0]);
this.texel3 = Convert.ToInt32(thirdVertex[1]);
this.normal3 = Convert.ToInt32(thirdVertex[2]);
Debug.Assert(normal1 == normal2);
Debug.Assert(normal1 == normal3);
this.material = material;
}
/// <summary>
/// Parses an OBJ file
/// </summary>
/// <param name="fileName"></param>
private void parseObjFile(string fileName)
{
vertexArray = new List<Vector3f>();
texelArray = new List<Vector2f>();
normalArray = new List<Vector3f>();
triangleArray = new List<Triangle>();
Dictionary<string, Material> materialDict = null;
Material currentMaterial = new Material();
FileInfo fileInfo = new FileInfo(fileName);
bool validTexture = false;
using (StreamReader reader = File.OpenText(fileName))
{
string line;
while ((line = reader.ReadLine()) != null)
{
string[] items = line.Split(' ');
switch (items[0])
{
case "#":
continue;
case "v":
vertexArray.Add(new Vector3f(items[1], items[2], items[3]));
break;
case "vt":
texelArray.Add(new Vector2f(items[1], items[2]));
break;
case "vn":
normalArray.Add(new Vector3f(items[1], items[2], items[3]));
break;
case "f":
Debug.Assert(currentMaterial.id != null);
if (validTexture)
{
triangleArray.Add(new Triangle(items[1], items[2], items[3], currentMaterial));
}
break;
case "mtllib":
materialDict = parseMtlFile(fileInfo.DirectoryName + @"\" + items[1]);
break;
case "usemtl":
Debug.Assert(materialDict != null);
Material tempMaterial;
validTexture = materialDict.TryGetValue(items[1], out tempMaterial);
if (validTexture) { currentMaterial = tempMaterial; }
break;
}
}
}
}
/// <summary>
/// Parses an MTL file
/// </summary>
/// <param name="filename">The absolute path to the MTL file. For example: @"C:\Users\Mike\Documents\Visual Studio 2008\Projects\SkatePark\SkatePark\Raw Models\DAE to OBJ\Cube\cube.mtl". Hint: Derive the path from the OBJ file.</param>
/// <returns>A Dictionary of Material IDs to their Materials</returns>
private Dictionary<string, Material> parseMtlFile(string filename)
{
Dictionary<string, Material> materialDict = new Dictionary<string, Material>();
Material currentMaterial = new Material();
using (StreamReader reader = File.OpenText(filename))
{
string line;
while ((line = reader.ReadLine()) != null)
{
string[] items = line.Split(' ');
switch (items[0])
{
case "#":
continue;
case "newmtl":
if ((currentMaterial.id != null) && (currentMaterial.fileName != null))
{
materialDict.Add(currentMaterial.id, currentMaterial);
}
currentMaterial = new Material();
currentMaterial.id = items[1];
break;
case "Ka":
currentMaterial.ambient = new Vector3f(items[1], items[2], items[3]);
break;
case "Kd":
currentMaterial.diffuse = new Vector3f(items[1], items[2], items[3]);
break;
case "Ks":
currentMaterial.specular = new Vector3f(items[1], items[2], items[3]);
break;
case "map_Kd":
FileInfo fileInfo = new FileInfo(filename);
currentMaterial.fileName = fileInfo.DirectoryName + @"\" + items[1];
break;
}
}
}
materialDict.Add(currentMaterial.id, currentMaterial);
LoadGLTextures(filename, materialDict);
return materialDict;
}
