void ObjMeshRender::renderGroupEdges(const char * groupName)
{
//get the group
string name(groupName);
ObjMesh::Group group = mesh->getGroup(name);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glEnable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(1.0, 1.0);
for( unsigned int iFace = 0; iFace < group.getNumFaces(); ++iFace )
{
ObjMesh::Face face = group.getFace(iFace);
glBegin(GL_POLYGON);
for( unsigned int iVertex = 0; iVertex < face.getNumVertices(); ++iVertex )
{
const ObjMesh::Vertex * vertexHandle = face.getVertexHandle(iVertex);
Vec3d v = mesh->getPosition(*vertexHandle);
glVertex3d(v[0], v[1], v[2]);
}
glEnd();
}
glDisable(GL_POLYGON_OFFSET_LINE);
}
ObjMesh * ObjMeshOrientable::GenerateOrientedMesh()
{
ObjMesh * outputObjMesh = new ObjMesh(*objMesh);
for(unsigned int i=0; i < outputObjMesh->getNumGroups(); i++) // over all groups
{
ObjMesh::Group * groupHandle = (ObjMesh::Group*) outputObjMesh->getGroupHandle(i);
for (unsigned int j=0; j < groupHandle->getNumFaces(); j++) // over all faces
{
const ObjMesh::Face * face = groupHandle->getFaceHandle(j);
if (face->getNumVertices() < 3)
{
printf("Warning: encountered a face with fewer than 3 vertices.\n");
continue;
}
HalfEdge edge = edgeAtFace(i, j);
// loop until edge is first edge
unsigned int startPosition = face->getVertex(0).getPositionIndex();
while (edgeStartVertex(edge).getPositionIndex() != startPosition)
edge = edgeNext(edge);
// reverse the face if not correctly oriented
if (edgeEndVertex(edge).getPositionIndex() != face->getVertex(1).getPositionIndex())
groupHandle->reverseFace(j);
}
}
return outputObjMesh;
}