void ObjMeshRender::renderNormals(double normalLength)
{
double diameter = mesh->getDiameter();
glBegin(GL_LINES);
for(unsigned int i=0; i < mesh->getNumGroups(); i++)
{
const ObjMesh::Group * groupHandle = mesh->getGroupHandle(i);
for(unsigned int iFace = 0; iFace < groupHandle->getNumFaces(); ++iFace)
{
ObjMesh::Face face = groupHandle->getFace(iFace);
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]);
// compute endpoint
Vec3d vnormalOffset;
if(vertexHandle->hasNormalIndex())
vnormalOffset = v + normalLength * diameter * mesh->getNormal(*vertexHandle);
else
vnormalOffset = v;
glVertex3d(vnormalOffset[0], vnormalOffset[1], vnormalOffset[2]);
}
}
}
glEnd();
}
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);
}
void ObjMeshRender::outputOpenGLRenderCode()
{
for(unsigned int i=0; i < mesh->getNumGroups(); i++)
{
const ObjMesh::Group * groupHandle = mesh->getGroupHandle(i);
// set material
ObjMesh::Material material = mesh->getMaterial(groupHandle->getMaterialIndex());
Vec3d Ka = material.getKa();
Vec3d Kd = material.getKd();
Vec3d Ks = material.getKs();
float shininess = material.getShininess();
printf("float ambient[4] = { %f, %f, %f, 1.0 };\n", Ka[0], Ka[1], Ka[2]);
printf("float diffuse[4] = { %f, %f, %f, 1.0 };\n", Kd[0], Kd[1], Kd[2]);
printf("float specular[4] = { %f, %f, %f, 1.0 };\n", Ks[0], Ks[1], Ks[2]);
printf("glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, ambient);\n");
printf("glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, diffuse);\n");
printf("glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular);\n");
printf("glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, %f);\n", shininess);
for( unsigned int iFace = 0; iFace < groupHandle->getNumFaces(); ++iFace )
{
ObjMesh::Face face = groupHandle->getFace(iFace);
printf("glBegin(GL_POLYGON);\n");
for( unsigned int iVertex = 0; iVertex < face.getNumVertices(); ++iVertex )
{
const ObjMesh::Vertex * vertexHandle = face.getVertexHandle(iVertex);
Vec3d v = mesh->getPosition(*vertexHandle);
// set normal
if( vertexHandle->hasNormalIndex() )
{
Vec3d normal = mesh->getNormal(*vertexHandle);
printf("glNormal3d(%f,%f,%f);\n", normal[0], normal[1], normal[2]);
}
// set texture coordinate
if(vertexHandle->hasTextureCoordinateIndex())
{
Vec3d textureCoordinate = mesh->getTextureCoordinate(*vertexHandle);
printf("glTexCoord2d(%f,%f);\n", textureCoordinate[0], textureCoordinate[1]);
}
printf("glVertex3d(%f,%f,%f);\n", v[0],v[1],v[2]);
}
printf("glEnd();\n");
}
}
}