public static D3ObjectGroup ImportObjectsFromObjFile(string strObjData)
{
D3ObjectGroup d3ObjectGroup = new D3ObjectGroup();
string[] lines = strObjData.Split(new string[] { "\r\n" }, StringSplitOptions.None);
int i = 0;
List <Vertex3f> listV = new List <Vertex3f>();
List <Vertex3f> listT = new List <Vertex3f>();
List <Vertex3f> listN = new List <Vertex3f>();
Vertex3f vertex;
Vertex3f texture;
Vertex3f normal;
VertexNormal vertnorm;
D3Object d3Object = null;
string[] items;
string[] subitems;
int idxV;
int idxT;
int idxN;
Face face;
while (i < lines.Length)
{
//Debug.WriteLine(i.ToString());
if (lines[i].StartsWith("#") || //comment
lines[i].StartsWith("mtllib") || //material library. We build our own.
lines[i].StartsWith("usemtl")) //use material
{
i++;
continue; //we don't care about any of these
}
if (lines[i].StartsWith("o")) //object. For example "o cube1"
//vertices and normals are per object as they are pulled out of the file,
//but we need to regroup them per d3Object.
{
i++;
continue;
}
if (lines[i].StartsWith("v ")) //vertex. For example "v -0.34671119 0.22176000 0.83703486"
{
items = lines[i].Split(' ');
vertex = new Vertex3f();
vertex.X = Convert.ToSingle(items[1], CultureInfo.InvariantCulture);
vertex.Y = Convert.ToSingle(items[2], CultureInfo.InvariantCulture);
vertex.Z = Convert.ToSingle(items[3], CultureInfo.InvariantCulture);
listV.Add(vertex);
i++;
continue;
}
if (lines[i].StartsWith("vt")) //vertex. For example "vt 0.72553915 0.63685900"
{
items = lines[i].Split(' ');
texture = new Vertex3f();
texture.X = Convert.ToSingle(items[1], CultureInfo.InvariantCulture);
texture.Y = Convert.ToSingle(items[2], CultureInfo.InvariantCulture);
//texture.Z=Convert.ToSingle(items[3],CultureInfo.InvariantCulture);
listT.Add(texture);
i++;
continue;
}
if (lines[i].StartsWith("vn")) //normal. For example "vn -0.32559605 -0.84121753 -0.43167149"
{
items = lines[i].Split(' ');
normal = new Vertex3f();
normal.X = Convert.ToSingle(items[1], CultureInfo.InvariantCulture);
normal.Y = Convert.ToSingle(items[2], CultureInfo.InvariantCulture);
normal.Z = Convert.ToSingle(items[3], CultureInfo.InvariantCulture);
listN.Add(normal);
i++;
continue;
}
if (lines[i].StartsWith("g")) //group. For example "g cylinder2_default"
{
if (d3Object != null)
{
d3ObjectGroup.D3Objects.Add(d3Object); //add the previous object to the group
}
d3Object = new D3Object(); //start the new one, including the new list of VNs
d3Object.Name = lines[i].Substring(2);
i++;
continue;
}
if (lines[i].StartsWith("f")) //face. For example "f 12//384 51//443 384//336 383//335". Format is v//n
{
items = lines[i].Split(' '); //5 items in this example
//create triangle fan, preserving counterclockwise order
for (int f = 2; f < items.Length - 1; f++) //one face/triangle per loop, 2 triangles in this case
{
face = new Face();
//only grab three vertices
//first vertex is always the 0 for the fan
subitems = items[1].Split('/'); //12,,384 for the first triangle
idxV = Convert.ToInt32(subitems[0]) - 1; //11 for the first triangle
if (subitems[1] == "") //no texture
{
idxT = -1;
}
else
{
idxT = Convert.ToInt32(subitems[1]) - 1;
}
idxN = Convert.ToInt32(subitems[2]) - 1; //383 for the first triangle
vertnorm = new VertexNormal();
vertnorm.Vertex = listV[idxV];
if (idxT != -1)
{
vertnorm.Texture = listT[idxT];
}
vertnorm.Normal = listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
//second vertex
subitems = items[f].Split('/'); //51,,443 for the first triangle
idxV = Convert.ToInt32(subitems[0]) - 1; //50 for the first triangle
if (subitems[1] == "") //no texture
{
idxT = -1;
}
else
{
idxT = Convert.ToInt32(subitems[1]) - 1;
}
idxN = Convert.ToInt32(subitems[2]) - 1; //442 for the first triangle
vertnorm = new VertexNormal();
vertnorm.Vertex = listV[idxV];
if (idxT != -1)
{
vertnorm.Texture = listT[idxT];
}
vertnorm.Normal = listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
//third vertex
subitems = items[f + 1].Split('/'); //384,,336 for the first triangle
idxV = Convert.ToInt32(subitems[0]) - 1; //383 for the first triangle
if (subitems[1] == "") //no texture
{
idxT = -1;
}
else
{
idxT = Convert.ToInt32(subitems[1]) - 1;
}
idxN = Convert.ToInt32(subitems[2]) - 1; //335 for the first triangle
vertnorm = new VertexNormal();
vertnorm.Vertex = listV[idxV];
if (idxT != -1)
{
vertnorm.Texture = listT[idxT];
}
vertnorm.Normal = listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
d3Object.Faces.Add(face);
}
i++;
continue;
}
//might be another kind of row that we missed above
i++;
}
if (d3Object != null)
{
d3ObjectGroup.D3Objects.Add(d3Object); //add the last object to the group
}
return(d3ObjectGroup);
}
public static D3ObjectGroup ImportObjectsFromObjFile(string strObjData) {
D3ObjectGroup d3ObjectGroup=new D3ObjectGroup();
string[] lines=strObjData.Split(new string[] {"\r\n"},StringSplitOptions.None);
int i=0;
List<Vertex3f> listV=new List<Vertex3f>();
List<Vertex3f> listT=new List<Vertex3f>();
List<Vertex3f> listN=new List<Vertex3f>();
Vertex3f vertex;
Vertex3f texture;
Vertex3f normal;
VertexNormal vertnorm;
D3Object d3Object=null;
string[] items;
string[] subitems;
int idxV;
int idxT;
int idxN;
Face face;
while(i<lines.Length){
//Debug.WriteLine(i.ToString());
if(lines[i].StartsWith("#")//comment
|| lines[i].StartsWith("mtllib")//material library. We build our own.
|| lines[i].StartsWith("usemtl"))//use material
{
i++;
continue;//we don't care about any of these
}
if(lines[i].StartsWith("o")) {//object. For example "o cube1"
//vertices and normals are per object as they are pulled out of the file,
//but we need to regroup them per d3Object.
i++;
continue;
}
if(lines[i].StartsWith("v ")) {//vertex. For example "v -0.34671119 0.22176000 0.83703486"
items=lines[i].Split(' ');
vertex=new Vertex3f();
vertex.X=Convert.ToSingle(items[1],CultureInfo.InvariantCulture);
vertex.Y=Convert.ToSingle(items[2],CultureInfo.InvariantCulture);
vertex.Z=Convert.ToSingle(items[3],CultureInfo.InvariantCulture);
listV.Add(vertex);
i++;
continue;
}
if(lines[i].StartsWith("vt")) {//vertex. For example "vt 0.72553915 0.63685900"
items=lines[i].Split(' ');
texture=new Vertex3f();
texture.X=Convert.ToSingle(items[1],CultureInfo.InvariantCulture);
texture.Y=Convert.ToSingle(items[2],CultureInfo.InvariantCulture);
//texture.Z=Convert.ToSingle(items[3],CultureInfo.InvariantCulture);
listT.Add(texture);
i++;
continue;
}
if(lines[i].StartsWith("vn")) {//normal. For example "vn -0.32559605 -0.84121753 -0.43167149"
items=lines[i].Split(' ');
normal=new Vertex3f();
normal.X=Convert.ToSingle(items[1],CultureInfo.InvariantCulture);
normal.Y=Convert.ToSingle(items[2],CultureInfo.InvariantCulture);
normal.Z=Convert.ToSingle(items[3],CultureInfo.InvariantCulture);
listN.Add(normal);
i++;
continue;
}
if(lines[i].StartsWith("g")) {//group. For example "g cylinder2_default"
if(d3Object!=null) {
d3ObjectGroup.D3Objects.Add(d3Object);//add the previous object to the group
}
d3Object=new D3Object();//start the new one, including the new list of VNs
d3Object.Name=lines[i].Substring(2);
i++;
continue;
}
if(lines[i].StartsWith("f")) {//face. For example "f 12//384 51//443 384//336 383//335". Format is v//n
items=lines[i].Split(' ');//5 items in this example
//create triangle fan, preserving counterclockwise order
for(int f=2;f<items.Length-1;f++) {//one face/triangle per loop, 2 triangles in this case
face=new Face();
//only grab three vertices
//first vertex is always the 0 for the fan
subitems=items[1].Split('/');//12,,384 for the first triangle
idxV=Convert.ToInt32(subitems[0])-1;//11 for the first triangle
if(subitems[1]=="") {//no texture
idxT=-1;
}
else {
idxT=Convert.ToInt32(subitems[1])-1;
}
idxN=Convert.ToInt32(subitems[2])-1;//383 for the first triangle
vertnorm=new VertexNormal();
vertnorm.Vertex=listV[idxV];
if(idxT!=-1) {
vertnorm.Texture=listT[idxT];
}
vertnorm.Normal=listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
//second vertex
subitems=items[f].Split('/');//51,,443 for the first triangle
idxV=Convert.ToInt32(subitems[0])-1;//50 for the first triangle
if(subitems[1]=="") {//no texture
idxT=-1;
}
else {
idxT=Convert.ToInt32(subitems[1])-1;
}
idxN=Convert.ToInt32(subitems[2])-1;//442 for the first triangle
vertnorm=new VertexNormal();
vertnorm.Vertex=listV[idxV];
if(idxT!=-1) {
vertnorm.Texture=listT[idxT];
}
vertnorm.Normal=listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
//third vertex
subitems=items[f+1].Split('/');//384,,336 for the first triangle
idxV=Convert.ToInt32(subitems[0])-1;//383 for the first triangle
if(subitems[1]=="") {//no texture
idxT=-1;
}
else {
idxT=Convert.ToInt32(subitems[1])-1;
}
idxN=Convert.ToInt32(subitems[2])-1;//335 for the first triangle
vertnorm=new VertexNormal();
vertnorm.Vertex=listV[idxV];
if(idxT!=-1) {
vertnorm.Texture=listT[idxT];
}
vertnorm.Normal=listN[idxN];
face.IndexList.Add(d3Object.GetIndexForVertNorm(vertnorm));
d3Object.Faces.Add(face);
}
i++;
continue;
}
//might be another kind of row that we missed above
i++;
}
if(d3Object!=null) {
d3ObjectGroup.D3Objects.Add(d3Object);//add the last object to the group
}
return d3ObjectGroup;
}