private Dictionary <string, Mesh> LoadObj(Stream input)
{
TextReader reader = new StreamReader(input);
string line;
while ((line = reader.ReadLine()) != null)
{
string[] tokenized = line.Split(tokenSeperator, StringSplitOptions.RemoveEmptyEntries);
if (tokenized.Length == 0)
{
continue;
}
switch (tokenized[0])
{
case "#": break;
case "g":
{
if (currentMeshName != string.Empty && !meshes.ContainsKey(currentMeshName) && vertices.Count != 0)
{
GenerateMesh(currentMeshName, vertices, (currentMaterialName != string.Empty && materials.ContainsKey(currentMaterialName) ? materials[currentMaterialName] : null), ref meshes);
}
if (tokenized.Length == 1)
{
currentMeshName = tokenized.GetHashCode().ToString(); /* TODO: better way to name meshes? */
}
else
{
currentMeshName = line.Substring(line.IndexOf(tokenized[1]));
}
}
break;
case "mtllib":
{
string mtlPath = FileMethods.CreateFullPath((input as FileStream).Name, line.Substring(line.IndexOf(tokenized[1])));
if (File.Exists(mtlPath))
{
using (Stream mtlStream = File.Open(mtlPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
ParseMtl(mtlStream, ref materials);
}
}
}
break;
case "usemtl":
{
currentMaterialName = line.Substring(line.IndexOf(tokenized[1]));
}
break;
case "v":
{
if (tokenized.Length == 5)
{
positions.Add(
new Vector4(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
float.Parse(tokenized[2], CultureInfo.InvariantCulture),
float.Parse(tokenized[3], CultureInfo.InvariantCulture),
float.Parse(tokenized[4], CultureInfo.InvariantCulture)));
}
else if (tokenized.Length == 4)
{
positions.Add(
new Vector4(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
float.Parse(tokenized[2], CultureInfo.InvariantCulture),
float.Parse(tokenized[3], CultureInfo.InvariantCulture),
1.0f));
}
else if (tokenized.Length == 3)
{
positions.Add(
new Vector4(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
float.Parse(tokenized[2], CultureInfo.InvariantCulture),
0.0f,
1.0f));
}
}
break;
case "vt":
{
texCoords.Add(
new Vector2(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
-float.Parse(tokenized[2], CultureInfo.InvariantCulture)));
}
break;
case "vn":
{
normals.Add(
new Vector3(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
float.Parse(tokenized[2], CultureInfo.InvariantCulture),
float.Parse(tokenized[3], CultureInfo.InvariantCulture)));
}
break;
case "vc":
{
colors.Add(
new Color4(
float.Parse(tokenized[1], CultureInfo.InvariantCulture),
float.Parse(tokenized[2], CultureInfo.InvariantCulture),
float.Parse(tokenized[3], CultureInfo.InvariantCulture),
float.Parse(tokenized[4], CultureInfo.InvariantCulture)));
}
break;
case "f":
{
int[] positionIndices = new int[tokenized.Length - 1];
int[] texCoordIndices = new int[tokenized.Length - 1];
int[] normalIndices = new int[tokenized.Length - 1];
int[] colorIndices = new int[tokenized.Length - 1];
for (int i = 0; i < tokenized.Length - 1; i++)
{
string[] values = tokenized[i + 1].Split('/');
int[] positionLocal = new int[3];
int[] texCoordLocal = new int[3];
int[] normalLocal = new int[3];
int[] colorLocal = new int[3];
int.TryParse(values[0], out positionIndices[i]);
if (values.Length >= 2 && values[1] != string.Empty)
{
int.TryParse(values[1], out texCoordIndices[i]);
}
else
{
texCoordIndices[i] = positionIndices[i];
}
if (values.Length >= 3 && values[2] != string.Empty)
{
int.TryParse(values[2], out normalIndices[i]);
}
else
{
normalIndices[i] = positionIndices[i];
}
if (values.Length >= 4 && values[3] != string.Empty)
{
int.TryParse(values[3], out colorIndices[i]);
}
else
{
colorIndices[i] = positionIndices[i];
}
positionIndices[i] -= 1;
texCoordIndices[i] -= 1;
normalIndices[i] -= 1;
colorIndices[i] -= 1;
if (i >= 2)
{
if (positionIndices[0 + (i - 2)] != -1 && positionIndices[1 + (i - 2)] != -1 && positionIndices[2 + (i - 2)] != -1)
{
positionLocal[0] = positionIndices[0]; texCoordLocal[0] = texCoordIndices[0]; normalLocal[0] = normalIndices[0]; colorLocal[0] = colorIndices[0];
positionLocal[1] = positionIndices[i - 1]; texCoordLocal[1] = texCoordIndices[i - 1]; normalLocal[1] = normalIndices[i - 1]; colorLocal[1] = colorIndices[i - 1];
positionLocal[2] = positionIndices[i]; texCoordLocal[2] = texCoordIndices[i]; normalLocal[2] = normalIndices[i]; colorLocal[2] = colorIndices[i];
CommonVertex[] localVerts = new CommonVertex[3];
for (int j = 0; j < localVerts.Length; j++)
{
Vector4 localPosition = (positionIndices[j] != -1 && positionIndices[j] < positions.Count ? positions[positionIndices[j]] : Vector4.Zero);
Vector2 localTexCoords = (texCoordIndices[j] != -1 && texCoordIndices[j] < texCoords.Count ? texCoords[texCoordIndices[j]] : Vector2.Zero);
Vector3 localNormals = (normalIndices[j] != -1 && normalIndices[j] < normals.Count ? normals[normalIndices[j]] : Vector3.Zero);
Color4 localColor = (colorIndices[j] != -1 && colorIndices[j] < colors.Count ? colors[colorIndices[j]] : Color4.White);
localVerts[j] = new CommonVertex()
{
Position = localPosition,
TexCoord = localTexCoords,
Normal = localNormals,
Color = localColor
};
}
vertices.AddRange(localVerts);
}
}
}
}
break;
}
}
reader.Close();
if (meshes.Count == 0 || vertices.Count != 0)
{
GenerateMesh("mesh", vertices, (currentMaterialName != string.Empty && materials.ContainsKey(currentMaterialName) ? materials[currentMaterialName] : null), ref meshes);
}
return(meshes);
}
private void ParseMtl(Stream input, ref Dictionary <string, Material> materials)
{
bool materialOpen = false;
string currentMaterialName = string.Empty;
string texturePathAmbient = string.Empty, texturePathDiffuse = string.Empty, texturePathSpecular = string.Empty;
Color4 ambientColor = Color4.White, diffuseColor = Color4.Gray, specularColor = Color4.Black;
float alpha = -1.0f;
TextReader reader = new StreamReader(input);
string line;
while ((line = reader.ReadLine()) != null)
{
string[] tokenized = line.Split(tokenSeperator, StringSplitOptions.RemoveEmptyEntries);
if (tokenized.Length == 0)
{
continue;
}
switch (tokenized[0])
{
case "#": break;
case "newmtl":
{
if (materialOpen)
{
GenerateMaterial(currentMaterialName, texturePathAmbient, texturePathDiffuse, texturePathSpecular, ambientColor, diffuseColor, specularColor, alpha, ref materials);
}
materialOpen = true;
currentMaterialName = line.Substring(line.IndexOf(tokenized[1]));
ambientColor = Color4.White;
diffuseColor = Color4.Gray;
specularColor = Color4.Black;
alpha = -1.0f;
}
break;
case "Ka":
ambientColor = new Color4(
float.Parse(tokenized[1], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[2], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[3], NumberStyles.Float, CultureInfo.InvariantCulture),
1.0f);
break;
case "Kd":
diffuseColor = new Color4(
float.Parse(tokenized[1], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[2], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[3], NumberStyles.Float, CultureInfo.InvariantCulture),
1.0f);
break;
case "Ks":
specularColor = new Color4(
float.Parse(tokenized[1], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[2], NumberStyles.Float, CultureInfo.InvariantCulture),
float.Parse(tokenized[3], NumberStyles.Float, CultureInfo.InvariantCulture),
1.0f);
break;
case "Tr":
case "d":
float newAlpha = float.Parse(tokenized[1], NumberStyles.Float, CultureInfo.InvariantCulture);
if (alpha == -1.0f)
{
alpha = newAlpha;
}
break;
case "map_Ka":
case "mapKa":
texturePathAmbient = FileMethods.CreateFullPath((input as FileStream).Name, line.Substring(line.IndexOf(tokenized[1])));
break;
case "map_Kd":
case "mapKd":
texturePathDiffuse = FileMethods.CreateFullPath((input as FileStream).Name, line.Substring(line.IndexOf(tokenized[1])));
break;
case "map_Ks":
case "mapKs":
texturePathSpecular = FileMethods.CreateFullPath((input as FileStream).Name, line.Substring(line.IndexOf(tokenized[1])));
break;
}
}
reader.Close();
if (materialOpen)
{
GenerateMaterial(currentMaterialName, texturePathAmbient, texturePathDiffuse, texturePathSpecular, ambientColor, diffuseColor, specularColor, alpha, ref materials);
}
}
