Mesh LoadMesh()
{
MeshIndexed meshIndexed = new MeshIndexed();
int vertexStart = GetIndex("vertices");
int vertexCount = (int)GetNumber(file[vertexStart], "#", 5);
int textureStart = GetIndex("texture");
int textureCount = (int)GetNumber(file[textureStart], "#", 4);
meshIndexed.vertexList = new Vertex[vertexCount];
meshIndexed.textures = new TextureCoord[textureCount];
int count = GetIndex("object") + 2;
//obtengo la lista de puntos
for (int i = 0; i < vertexCount; i++)
{
meshIndexed.vertexList[i] = GetVertexPoint(file[i + count]);
}
count = GetIndex("vt");
//obtengo la lista de coordenadas de textura
for (int i = 0; i < textureCount; i++)
{
meshIndexed.textures[i] = GetTexturePoint(file[i + count], 3);
}
int facesStart = GetIndex("faces");
int facesCount = (int)GetNumber(file[facesStart], "#", 5);
meshIndexed.faceList = new FaceIndexed[facesCount];
count = GetIndex("f ");
int index = 0;
int s = 0;
// para obtener los indices de puntos y de texturas
for (int i = 0; i < facesCount + s; i++)
{
if (file[count + i].IndexOf('s') == -1)
{
meshIndexed.faceList[index].vertexIndexes = new int[3];
meshIndexed.faceList[index].textureIndexes = new int[3];
for (int j = 0; j < 3; j++)
{
indexes = GetIndexes(file[count + i], j);
meshIndexed.faceList[index].vertexIndexes[j] = indexes.faceIndex - prevVertex;
meshIndexed.faceList[index].textureIndexes[j] = indexes.textureIndex - prevTexture;
}
index++;
}
else
{
// s significa el material de las caras (no implementado)
s++;
}
}
prevVertex += vertexCount;
prevTexture += textureCount;
CalcularNormales(meshIndexed);
return(CopyMesh(meshIndexed));
}
public void LoadAllMeshes(List <MeshIndexed> outMeshes, float scale)
{
uint i;
for (i = 0; i < _meshes.Count; ++i)
{
MeshIndexed mesh = new MeshIndexed();
mesh = LoadMesh(i, mesh, scale, false);
outMeshes.Add(mesh);
}
}
public void LoadMesh(string name, MeshIndexed mesh, float scale)
{
MeshObject meshobj = null;
for (int i = 0; i < _meshes.Count; ++i)
{
meshobj = _meshes[i];
if (meshobj.name == name)
{
LoadMesh((uint)i, mesh, scale, false);
}
}
if (null == meshobj)
{
throw new Exception("No such named mesh object: " + name);
}
}
Mesh CopyMesh(MeshIndexed meshIndexed)
{
Mesh mesh = new Mesh();
mesh.Faces = new Face[meshIndexed.faceList.Length];
for (int i = 0; i < mesh.Faces.Length; i++)
{
Vertex[] vertex = new Vertex[3];
Vector3[] normal = new Vector3[3];
for (int j = 0; j < 3; j++)
{
vertex[j] = meshIndexed.vertexList[meshIndexed.faceList[i].vertexIndexes[j]];
vertex[j].u = meshIndexed.textures[meshIndexed.faceList[i].textureIndexes[j]].x;
vertex[j].v = meshIndexed.textures[meshIndexed.faceList[i].textureIndexes[j]].y;
normal[j] = meshIndexed.faceList[i].normal[j];
}
mesh.Faces[i].vertex = vertex;
mesh.Faces[i].normal = normal;
}
return(mesh);
}
public MeshIndexed LoadMesh(uint i, MeshIndexed meshIndexed, float scale, bool applySmoothingGroups)
{
Debug.Assert(i < _meshes.Count);
MeshObject meshobj = _meshes[(int)i];
meshIndexed.meshName = meshobj.name;
meshIndexed.matrix = meshobj.lmat;
meshIndexed.Allocate(meshobj.nVerts, meshobj.nFaces);
if (meshobj.mc != null)
{
// scale and transform the mesh object
for (i = 0; i < meshobj.nVerts; ++i)
{
Vector3 v = new Vector3(meshobj.verts[i].x * -1, meshobj.verts[i].y, meshobj.verts[i].z);
meshIndexed.SetVertexPosition(i, v);
meshIndexed.textures[i].y = meshobj.mc[i * 2];
meshIndexed.textures[i].x = meshobj.mc[(i * 2) + 1];
}
}
else
{
// scale and transform the mesh object
for (i = 0; i < meshobj.nVerts; ++i)
{
Vector3 v = new Vector3(meshobj.verts[i].x * -1, meshobj.verts[i].y, meshobj.verts[i].z);
meshIndexed.SetVertexPosition(i, v);
}
}
// Buffers for calculating smoothing groups
ushort[] sharedFaces = new ushort[meshIndexed.vertexList.Length];
Vector3[] summedNormals = new Vector3[meshIndexed.vertexList.Length];
Vector3 v1, v2, normal;
for (i = 0; i < meshobj.nFaces; ++i)
{
Face3S f = meshobj.faces[i];
// copy face information
meshIndexed.SetFaceIndicies(i, meshobj.faces[i].a, meshobj.faces[i].b, meshobj.faces[i].c);
// get the normal with the cross product of two verts
// on the same face
Vector3 a = new Vector3(meshobj.verts[f.a].x, meshobj.verts[f.a].y, meshobj.verts[f.a].z);
Vector3 b = new Vector3(meshobj.verts[f.b].x, meshobj.verts[f.b].y, meshobj.verts[f.b].z);
Vector3 c = new Vector3(meshobj.verts[f.c].x, meshobj.verts[f.c].y, meshobj.verts[f.c].z);
v1 = b - c;
v2 = a - b;
// calculate the normal, sum it in the normal
// array and
normal = Vector3.Cross(v1, v2) * -1;
normal.Normalize();
meshIndexed.SetVertexNormal(f.a, normal);
meshIndexed.SetVertexNormal(f.b, normal);
meshIndexed.SetVertexNormal(f.c, normal);
sharedFaces[f.a]++;
sharedFaces[f.b]++;
sharedFaces[f.c]++;
summedNormals[f.a] += normal;
summedNormals[f.b] += normal;
summedNormals[f.c] += normal;
}
if (applySmoothingGroups)
{
// apply the smoothing groups
for (int iv = 0; iv < meshIndexed.vertexList.Length; ++iv)
{
// get the weighted normal
Vector3 n = summedNormals[iv];
n = n / sharedFaces[iv];
// renorm
n.Normalize();
meshIndexed.SetVertexNormal(i, n);
}
}
// Lookup and assign materials groups, this will convert the material
// group to something that can be rendered quickly and has to happen
// after we have already loaded all the face->vert indexes
foreach (FaceMaterial material in meshobj.faceMaterials)
{
Material mat;
if (LookupMaterialByName(material.name, out mat))
{
if (mat.textures.Count > 0)
{
meshIndexed.textureName = mat.name;
}
meshIndexed.AddMaterialAmbient(mat.ambient.r, mat.ambient.g, mat.ambient.b);
meshIndexed.AddMaterialDifusse(mat.diffuse.r, mat.diffuse.g, mat.diffuse.b);
meshIndexed.AddMaterialSpecular(mat.specular.r, mat.specular.g, mat.specular.b);
// mesh.AddMaterialGroup(
// material.faces,
// new Color(mat.ambient.r, mat.ambient.g, mat.ambient.b),
// new Color(mat.diffuse.r, mat.diffuse.g, mat.diffuse.b),
// new Color(mat.specular.r, mat.diffuse.g, mat.diffuse.b));
}
}
return(meshIndexed);
}
void CalcularNormales(MeshIndexed objeto)
{
float NormalX = 0, NormalY = 0, NormalZ = 0;
float sumx = 0.0f, sumy = 0.0f, sumz = 0.0f;
int shared = 0;
int i, j;
int policount = objeto.faceList.Length;
int vertexcount = objeto.vertexList.Length;
Faces[] Tri = new Faces[policount];
for (i = 0; i < policount; i++)
{
objeto.faceList[i].normal = new Vector3[3];
}
for (i = 0; i < Tri.Length; i++)
{
Tri[i].V1 = new float[3];
Tri[i].V2 = new float[3];
Tri[i].V3 = new float[3];
Tri[i].N = new float[3];
}
float[,] vnormales = new float[vertexcount, 3];
for (i = 0; i < policount; i++)
{
//Vertice 1
j = objeto.faceList[i].vertexIndexes[0];
Tri[i].V1[0] = objeto.vertexList[j].x;
Tri[i].V1[1] = objeto.vertexList[j].y;
Tri[i].V1[2] = objeto.vertexList[j].z;
//Vertice 2
j = objeto.faceList[i].vertexIndexes[1];
Tri[i].V2[0] = objeto.vertexList[j].x;
Tri[i].V2[1] = objeto.vertexList[j].y;
Tri[i].V2[2] = objeto.vertexList[j].z;
//Vertice 3
j = objeto.faceList[i].vertexIndexes[2];
Tri[i].V3[0] = objeto.vertexList[j].x;
Tri[i].V3[1] = objeto.vertexList[j].y;
Tri[i].V3[2] = objeto.vertexList[j].z;
//Calcula el vector Normal
VectorNormal(Tri[i].V1, Tri[i].V2, Tri[i].V3, out NormalX, out NormalY, out NormalZ);
//nos retorna un vector unitario, es decir de modulo 1
Normalizar(ref NormalX, ref NormalY, ref NormalZ);
//almacena los vectores normales, para cada poligono
Tri[i].N[0] = NormalX;
Tri[i].N[1] = NormalY;
Tri[i].N[2] = NormalZ;
}
for (i = 0; i < vertexcount; i++)
{
for (j = 0; j < policount; j++)
{
if (objeto.faceList[j].vertexIndexes[0] == i || objeto.faceList[j].vertexIndexes[1] == i || objeto.faceList[j].vertexIndexes[2] == i)
{
sumx = sumx + Tri[j].N[0];
sumy = sumy + Tri[j].N[1];
sumz = sumz + Tri[j].N[2];
shared++;
}
}
vnormales[i, 0] = sumx / (float)shared;
vnormales[i, 1] = sumy / (float)shared;
vnormales[i, 2] = sumz / (float)shared;
Normalizar(ref vnormales[i, 0], ref vnormales[i, 1], ref vnormales[i, 2]);
sumx = 0.0f;
sumy = 0.0f;
sumz = 0.0f;
shared = 0;
}
//guardo las normales calculadas en el objeto
for (i = 0; i < policount; i++)
{
for (j = 0; j < 3; j++)
{
objeto.faceList[i].normal[j].X = vnormales[objeto.faceList[i].vertexIndexes[j], 0];
objeto.faceList[i].normal[j].Y = vnormales[objeto.faceList[i].vertexIndexes[j], 1];
objeto.faceList[i].normal[j].Z = vnormales[objeto.faceList[i].vertexIndexes[j], 2];
}
}
}
