mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
148 lines
5.3 KiB
C++
148 lines
5.3 KiB
C++
//============================================================================
|
|
// Copyright (c) Kitware, Inc.
|
|
// All rights reserved.
|
|
// See LICENSE.txt for details.
|
|
//
|
|
// This software is distributed WITHOUT ANY WARRANTY; without even
|
|
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
// PURPOSE. See the above copyright notice for more information.
|
|
//============================================================================
|
|
|
|
#include <complex>
|
|
#include <vtkm/cont/DataSetBuilderExplicit.h>
|
|
#include <vtkm/filter/geometry_refinement/worklet/Tube.h>
|
|
#include <vtkm/io/VTKDataSetWriter.h>
|
|
|
|
#include <vtkm/cont/ColorTable.h>
|
|
#include <vtkm/cont/CoordinateSystem.h>
|
|
#include <vtkm/rendering/Camera.h>
|
|
#include <vtkm/rendering/CanvasRayTracer.h>
|
|
#include <vtkm/rendering/MapperRayTracer.h>
|
|
#include <vtkm/rendering/Scene.h>
|
|
#include <vtkm/rendering/View3D.h>
|
|
|
|
vtkm::Vec3f ArchimedeanSpiralToCartesian(vtkm::Vec3f const& p)
|
|
{
|
|
// p[0] = r, p[1] = theta, p[2] = z:
|
|
vtkm::Vec3f xyz;
|
|
auto c = std::polar(p[0], p[1]);
|
|
xyz[0] = c.real();
|
|
xyz[1] = c.imag();
|
|
xyz[2] = p[2];
|
|
return xyz;
|
|
}
|
|
|
|
void TubeThatSpiral(vtkm::FloatDefault radius, vtkm::Id numLineSegments, vtkm::Id numSides)
|
|
{
|
|
vtkm::cont::DataSetBuilderExplicitIterative dsb;
|
|
std::vector<vtkm::Id> ids;
|
|
|
|
// The Archimedian spiral is defined by the equation r = a + b*theta.
|
|
// To extend to a 3D curve, use z = t, theta = t, r = a + b t.
|
|
vtkm::FloatDefault a = vtkm::FloatDefault(0.2);
|
|
vtkm::FloatDefault b = vtkm::FloatDefault(0.8);
|
|
for (vtkm::Id i = 0; i < numLineSegments; ++i)
|
|
{
|
|
vtkm::FloatDefault t = 4 * vtkm::FloatDefault(3.1415926) * (i + 1) /
|
|
numLineSegments; // roughly two spins around. Doesn't need to be perfect.
|
|
vtkm::FloatDefault r = a + b * t;
|
|
vtkm::FloatDefault theta = t;
|
|
vtkm::Vec3f cylindricalCoordinate{ r, theta, t };
|
|
vtkm::Vec3f spiralSample = ArchimedeanSpiralToCartesian(cylindricalCoordinate);
|
|
vtkm::Id pid = dsb.AddPoint(spiralSample);
|
|
ids.push_back(pid);
|
|
}
|
|
dsb.AddCell(vtkm::CELL_SHAPE_POLY_LINE, ids);
|
|
|
|
vtkm::cont::DataSet ds = dsb.Create();
|
|
|
|
vtkm::worklet::Tube tubeWorklet(
|
|
/*capEnds = */ true,
|
|
/* how smooth the cylinder is; infinitely smooth as n->infty */ numSides,
|
|
radius);
|
|
|
|
// You added lines, but you need to extend it to a tube.
|
|
// This generates a new pointset, and new cell set.
|
|
vtkm::cont::ArrayHandle<vtkm::Vec3f> tubePoints;
|
|
vtkm::cont::CellSetSingleType<> tubeCells;
|
|
tubeWorklet.Run(
|
|
ds.GetCoordinateSystem().GetData().AsArrayHandle<vtkm::cont::ArrayHandle<vtkm::Vec3f>>(),
|
|
ds.GetCellSet(),
|
|
tubePoints,
|
|
tubeCells);
|
|
|
|
vtkm::cont::DataSet tubeDataset;
|
|
tubeDataset.AddCoordinateSystem(vtkm::cont::CoordinateSystem("coords", tubePoints));
|
|
tubeDataset.SetCellSet(tubeCells);
|
|
|
|
vtkm::Bounds coordsBounds = tubeDataset.GetCoordinateSystem().GetBounds();
|
|
|
|
vtkm::Vec3f_64 totalExtent(
|
|
coordsBounds.X.Length(), coordsBounds.Y.Length(), coordsBounds.Z.Length());
|
|
vtkm::Float64 mag = vtkm::Magnitude(totalExtent);
|
|
vtkm::Normalize(totalExtent);
|
|
|
|
// setup a camera and point it to towards the center of the input data
|
|
vtkm::rendering::Camera camera;
|
|
camera.ResetToBounds(coordsBounds);
|
|
|
|
camera.SetLookAt(totalExtent * (mag * .5f));
|
|
camera.SetViewUp(vtkm::make_Vec(0.f, 1.f, 0.f));
|
|
camera.SetClippingRange(1.f, 100.f);
|
|
camera.SetFieldOfView(60.f);
|
|
camera.SetPosition(totalExtent * (mag * 2.f));
|
|
vtkm::cont::ColorTable colorTable("inferno");
|
|
|
|
vtkm::rendering::Scene scene;
|
|
vtkm::rendering::MapperRayTracer mapper;
|
|
vtkm::rendering::CanvasRayTracer canvas(2048, 2048);
|
|
vtkm::rendering::Color bg(0.2f, 0.2f, 0.2f, 1.0f);
|
|
|
|
|
|
std::vector<vtkm::FloatDefault> v(static_cast<std::size_t>(tubePoints.GetNumberOfValues()));
|
|
// The first value is a cap:
|
|
v[0] = 0;
|
|
for (vtkm::Id i = 1; i < vtkm::Id(v.size()); i += numSides)
|
|
{
|
|
vtkm::FloatDefault t = 4 * vtkm::FloatDefault(3.1415926) * (i + 1) / numSides;
|
|
vtkm::FloatDefault r = a + b * t;
|
|
for (vtkm::Id j = i; j < i + numSides && j < vtkm::Id(v.size()); ++j)
|
|
{
|
|
v[static_cast<std::size_t>(j)] = r;
|
|
}
|
|
}
|
|
// Point at the end cap should be the same color as the surroundings:
|
|
v[v.size() - 1] = v[v.size() - 2];
|
|
|
|
tubeDataset.AddPointField("Spiral Radius", v);
|
|
scene.AddActor(vtkm::rendering::Actor(tubeDataset.GetCellSet(),
|
|
tubeDataset.GetCoordinateSystem(),
|
|
tubeDataset.GetField("Spiral Radius"),
|
|
colorTable));
|
|
vtkm::rendering::View3D view(scene, mapper, canvas, camera, bg);
|
|
view.Paint();
|
|
// We can save the file as a .NetBPM:
|
|
std::string output_filename = "tube_output_" + std::to_string(numSides) + "_sides.pnm";
|
|
view.SaveAs(output_filename);
|
|
// Or as a .png:
|
|
output_filename = "tube_output_" + std::to_string(numSides) + "_sides.png";
|
|
view.SaveAs(output_filename);
|
|
}
|
|
|
|
|
|
|
|
int main()
|
|
{
|
|
// Radius of the tube:
|
|
vtkm::FloatDefault radius = 0.5f;
|
|
// How many segments is the tube decomposed into?
|
|
vtkm::Id numLineSegments = 100;
|
|
// As numSides->infty, the tubes becomes perfectly cylindrical:
|
|
vtkm::Id numSides = 50;
|
|
TubeThatSpiral(radius, numLineSegments, numSides);
|
|
// Setting numSides = 4 makes a square around the polyline:
|
|
numSides = 4;
|
|
TubeThatSpiral(radius, numLineSegments, numSides);
|
|
return 0;
|
|
}
|