Model *ModelBuilder::buildModel(const char* Filename) {
ObjModel *objModel;
ObjParser objParser;
std::cout << "Filename " << Filename << std::endl;
objModel = objParser.loadModelFromFile(Filename);
// assemble vertices and materials from collected data
unsigned int numberOfFaces = (int)objModel->faces.size();
unsigned int numberOfVertices = numberOfFaces * 3;
std::vector<Vertex> vertices(numberOfVertices);
std::vector<unsigned int> indices(numberOfVertices);
FaceGroup currentFaceGroup;
for(int i = 0; i < numberOfFaces; i++) {
// @todo: check for different mats and create face groups
unsigned int PosIdx0 = objModel->faces[i].pidx[0] - 1;
unsigned int PosIdx1 = objModel->faces[i].pidx[1] - 1;
unsigned int PosIdx2 = objModel->faces[i].pidx[2] - 1;
unsigned int TexIdx0 = objModel->faces[i].tidx[0] - 1;
unsigned int TexIdx1 = objModel->faces[i].tidx[1] - 1;
unsigned int TexIdx2 = objModel->faces[i].tidx[2] - 1;
// Positionen der Vertices setzen
Vector a = vertices[i * 3].position = objModel->positions[PosIdx0];
Vector b = vertices[i * 3 + 1].position = objModel->positions[PosIdx1];
Vector c = vertices[i * 3 + 2].position = objModel->positions[PosIdx2];
// Wenn aktuelles Objekt Textkoordinaten enthaelt, eben diese setzen
vertices[i * 3].texCoordS = objModel->textureCoordinates[TexIdx0].s;
vertices[i * 3 + 1].texCoordS = objModel->textureCoordinates[TexIdx1].s;
vertices[i * 3 + 2].texCoordS = objModel->textureCoordinates[TexIdx2].s;
vertices[i * 3].texCoordT = objModel->textureCoordinates[TexIdx0].t;
vertices[i * 3 + 1].texCoordT = objModel->textureCoordinates[TexIdx1].t;
vertices[i * 3 + 2].texCoordT = objModel->textureCoordinates[TexIdx2].t;
// Normalen berechnen
Vector normal = (b - a).cross(c - a);
normal.normalize();
vertices[i * 3].normal =
vertices[i * 3 + 1].normal =
vertices[i * 3 + 2].normal = normal;
indices[i * 3] = i * 3;
indices[i * 3 + 1] = i * 3 + 1;
indices[i * 3 + 2] = i * 3 + 2;
}
for (unsigned int i = 0; i < numberOfVertices; i++) {
vertices[i].normal.normalize();
}
Model *newModel = new Model();
newModel->setMaterials(objModel->materials, objModel->materialCount);
newModel->setVertices(vertices);
newModel->uploadVerticesToBuffer<Vertex>((unsigned int)vertices.size(), &vertices[0]);
newModel->uploadIndicesToBuffer<unsigned int>((unsigned int)indices.size(), &indices[0]);
return newModel;
}
