void VTKMeshFileExporter::execute() {
if(mFilename == "")
throw Exception("No filename given to the VTKMeshFileExporter");
Mesh::pointer surface = getStaticInputData<Mesh>();
// Get transformation
AffineTransformation::pointer transform = SceneGraph::getAffineTransformationFromData(surface);
std::ofstream file(mFilename.c_str());
if(!file.is_open())
throw Exception("Unable to open the file " + mFilename);
// Write header
file << "# vtk DataFile Version 3.0\n"
"vtk output\n"
"ASCII\n"
"DATASET POLYDATA\n";
// Write vertices
MeshAccess::pointer access = surface->getMeshAccess(ACCESS_READ);
std::vector<MeshVertex> vertices = access->getVertices();
file << "POINTS " << vertices.size() << " float\n";
for(int i = 0; i < vertices.size(); i++) {
MeshVertex vertex = vertices[i];
vertex.position = (transform->matrix()*vertex.position.homogeneous()).head(3);
file << vertex.position.x() << " " << vertex.position.y() << " " << vertex.position.z() << "\n";
}
// Write triangles
std::vector<Vector3ui> triangles = access->getTriangles();
file << "POLYGONS " << surface->getNrOfTriangles() << " " << surface->getNrOfTriangles()*4 << "\n";
for(int i = 0; i < triangles.size(); i++) {
Vector3ui triangle = triangles[i];
file << "3 " << triangle.x() << " " << triangle.y() << " " << triangle.z() << "\n";
}
// Write normals
file << "POINT_DATA " << vertices.size() << "\n";
file << "NORMALS Normals float\n";
for(int i = 0; i < vertices.size(); i++) {
MeshVertex vertex = vertices[i];
// Transform it
vertex.normal = transform->linear()*vertex.normal;
// Normalize it
float length = vertex.normal.norm();
if(length == 0) { // prevent NaN situations
file << "0 1 0\n";
} else {
file << (vertex.normal.x()/length) << " " << (vertex.normal.y()/length) << " " << (vertex.normal.z()/length) << "\n";
}
}
file.close();
}
int VTKMeshExporter::RequestData(
vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector,
vtkInformationVector* outputVector) {
update(); // Run FAST pipeline
Mesh::pointer input = getStaticInputData<Mesh>();
MeshAccess::pointer access = input->getMeshAccess(ACCESS_READ);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkPolyData *output = this->GetOutput();
vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
points->SetNumberOfPoints(input->getNrOfVertices());
for(int i = 0; i < input->getNrOfVertices(); i++) {
MeshVertex v = access->getVertex(i);
VectorXf position = v.getPosition();
if(input->getDimensions() == 2) {
points->SetPoint(i, position.x(), position.y(), 0);
} else {
points->SetPoint(i, position.x(), position.y(), position.z());
}
}
output->SetPoints(points);
vtkSmartPointer<vtkCellArray> polys = vtkSmartPointer<vtkCellArray>::New();
if(input->getDimensions() == 2) {
for(int i = 0; i < input->getNrOfLines(); i++) {
VectorXui line = access->getLine(i);
polys->InsertNextCell(2);
polys->InsertCellPoint(line.x());
polys->InsertCellPoint(line.y());
}
output->SetLines(polys);
} else {
for(int i = 0; i < input->getNrOfTriangles(); i++) {
VectorXui triangle = access->getTriangle(i);
polys->InsertNextCell(3);
polys->InsertCellPoint(triangle.x());
polys->InsertCellPoint(triangle.y());
polys->InsertCellPoint(triangle.z());
}
output->SetPolys(polys);
}
// TODO if 3D, also export normals
return 1;
}
void MeshRenderer::draw2D(
cl::BufferGL PBO,
uint width,
uint height,
Eigen::Transform<float, 3, Eigen::Affine> pixelToViewportTransform,
float PBOspacing,
Vector2f translation
) {
boost::lock_guard<boost::mutex> lock(mMutex);
OpenCLDevice::pointer device = getMainDevice();
cl::CommandQueue queue = device->getCommandQueue();
std::vector<cl::Memory> v;
v.push_back(PBO);
queue.enqueueAcquireGLObjects(&v);
// Map would probably be better here, but doesn't work on NVIDIA, segfault surprise!
//float* pixels = (float*)queue.enqueueMapBuffer(PBO, CL_TRUE, CL_MAP_WRITE, 0, width*height*sizeof(float)*4);
boost::shared_array<float> pixels(new float[width*height*sizeof(float)*4]);
queue.enqueueReadBuffer(PBO, CL_TRUE, 0, width*height*4*sizeof(float), pixels.get());
boost::unordered_map<uint, Mesh::pointer>::iterator it;
for(it = mMeshToRender.begin(); it != mMeshToRender.end(); it++) {
Mesh::pointer mesh = it->second;
if(mesh->getDimensions() != 2) // Mesh must be 2D
continue;
Color color = mDefaultColor;
ProcessObjectPort port = getInputPort(it->first);
if(mInputColors.count(port) > 0) {
color = mInputColors[port];
}
MeshAccess::pointer access = mesh->getMeshAccess(ACCESS_READ);
std::vector<VectorXui> lines = access->getLines();
std::vector<MeshVertex> vertices = access->getVertices();
// Draw each line
for(int i = 0; i < lines.size(); ++i) {
Vector2ui line = lines[i];
Vector2f a = vertices[line.x()].getPosition();
Vector2f b = vertices[line.y()].getPosition();
Vector2f direction = b - a;
float lengthInPixels = ceil(direction.norm() / PBOspacing);
// Draw the line
for(int j = 0; j <= lengthInPixels; ++j) {
Vector2f positionInMM = a + direction*((float)j/lengthInPixels);
Vector2f positionInPixels = positionInMM / PBOspacing;
int x = round(positionInPixels.x());
int y = round(positionInPixels.y());
y = height - 1 - y;
if(x < 0 || y < 0 || x >= width || y >= height)
continue;
pixels[4*(x + y*width)] = color.getRedValue();
pixels[4*(x + y*width) + 1] = color.getGreenValue();
pixels[4*(x + y*width) + 2] = color.getBlueValue();
}
}
}
//queue.enqueueUnmapMemObject(PBO, pixels);
queue.enqueueWriteBuffer(PBO, CL_TRUE, 0, width*height*4*sizeof(float), pixels.get());
queue.enqueueReleaseGLObjects(&v);
}