mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 02:25:42 +00:00
105 lines
4.0 KiB
C++
105 lines
4.0 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/cont/Initialize.h>
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#include <vtkm/cont/testing/MakeTestDataSet.h>
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#include <vtkm/rendering/Actor.h>
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#include <vtkm/rendering/CanvasRayTracer.h>
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#include <vtkm/rendering/MapperRayTracer.h>
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#include <vtkm/rendering/Scene.h>
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#include <vtkm/rendering/View3D.h>
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#include <vtkm/filter/Contour.h>
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// This example creates a simple data set and uses VTK-m's rendering engine to render an image and
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// write that image to a file. It then computes an isosurface on the input data set and renders
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// this output data set in a separate image file
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int main(int argc, char* argv[])
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{
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vtkm::cont::Initialize(argc, argv, vtkm::cont::InitializeOptions::Strict);
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// Input variable declarations
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vtkm::cont::testing::MakeTestDataSet maker;
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vtkm::cont::DataSet inputData = maker.Make3DUniformDataSet0();
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vtkm::Float32 isovalue = 100.0f;
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std::string fieldName = "pointvar";
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using Mapper = vtkm::rendering::MapperRayTracer;
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using Canvas = vtkm::rendering::CanvasRayTracer;
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// Set up a camera for rendering the input data
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const vtkm::cont::CoordinateSystem coords = inputData.GetCoordinateSystem();
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Mapper mapper;
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vtkm::rendering::Camera camera;
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//Set3DView
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vtkm::Bounds coordsBounds = coords.GetBounds();
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camera.ResetToBounds(coordsBounds);
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vtkm::Vec3f_32 totalExtent;
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totalExtent[0] = vtkm::Float32(coordsBounds.X.Length());
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totalExtent[1] = vtkm::Float32(coordsBounds.Y.Length());
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totalExtent[2] = vtkm::Float32(coordsBounds.Z.Length());
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vtkm::Float32 mag = vtkm::Magnitude(totalExtent);
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vtkm::Normalize(totalExtent);
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camera.SetLookAt(totalExtent * (mag * .5f));
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camera.SetViewUp(vtkm::make_Vec(0.f, 1.f, 0.f));
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camera.SetClippingRange(1.f, 100.f);
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camera.SetFieldOfView(60.f);
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camera.SetPosition(totalExtent * (mag * 2.f));
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vtkm::cont::ColorTable colorTable("inferno");
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// Create a scene for rendering the input data
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vtkm::rendering::Scene scene;
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vtkm::rendering::Color bg(0.2f, 0.2f, 0.2f, 1.0f);
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Canvas canvas(512, 512);
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vtkm::rendering::Actor actor(inputData.GetCellSet(),
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inputData.GetCoordinateSystem(),
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inputData.GetField(fieldName),
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colorTable);
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scene.AddActor(actor);
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// Create a view and use it to render the input data using OS Mesa
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vtkm::rendering::View3D view(scene, mapper, canvas, camera, bg);
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view.Initialize();
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view.Paint();
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view.SaveAs("demo_input.pnm");
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// Create an isosurface filter
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vtkm::filter::Contour filter;
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filter.SetGenerateNormals(false);
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filter.SetMergeDuplicatePoints(false);
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filter.SetIsoValue(0, isovalue);
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filter.SetActiveField(fieldName);
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vtkm::cont::DataSet outputData = filter.Execute(inputData);
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// Render a separate image with the output isosurface
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std::cout << "about to render the results of the Contour filter" << std::endl;
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vtkm::rendering::Scene scene2;
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vtkm::rendering::Actor actor2(outputData.GetCellSet(),
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outputData.GetCoordinateSystem(),
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outputData.GetField(fieldName),
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colorTable);
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// By default, the actor will automatically scale the scalar range of the color table to match
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// that of the data. However, we are coloring by the scalar that we just extracted a contour
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// from, so we want the scalar range to match that of the previous image.
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actor2.SetScalarRange(actor.GetScalarRange());
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scene2.AddActor(actor2);
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vtkm::rendering::View3D view2(scene2, mapper, canvas, camera, bg);
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view2.Initialize();
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view2.Paint();
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view2.SaveAs("demo_output.pnm");
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return 0;
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}
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