231 lines
7.8 KiB
C++
231 lines
7.8 KiB
C++
/*******************************************************************************
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Copyright (c) 2010 Matt Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#include "TestSurfaceExtractor.h"
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#include "PolyVoxCore/Density.h"
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#include "PolyVoxCore/MaterialDensityPair.h"
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#include "PolyVoxCore/SimpleVolume.h"
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#include "PolyVoxCore/MarchingCubesSurfaceExtractor.h"
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#include <QtTest>
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using namespace PolyVox;
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// Test our ability to modify the behaviour of the MarchingCubesSurfaceExtractor. This simple example only modifies
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// the threshold (and actually this can be achieved by passing a parameter to the constructor of the
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// DefaultMarchingCubesController) but you could implement custom behaviour in the other members
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// if you wanted too. Actually, it's not clear if this ability is really useful because I can't think
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// what you'd modify apart from the threshold but the ability is at least available. Also, the
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// DefaultMarchingCubesController is templatised whereas this exmple shows that controllers don't
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// have to be.
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class CustomMarchingCubesController
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{
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public:
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typedef float DensityType;
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typedef float MaterialType;
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float convertToDensity(float voxel)
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{
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return voxel;
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}
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float convertToMaterial(float /*voxel*/)
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{
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return 1;
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}
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float getThreshold(void)
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{
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return 50.0f;
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}
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WrapMode getWrapMode(void)
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{
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return WrapModes::Border;
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}
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float m_tBorder;
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};
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// These 'writeDensityValueToVoxel' functions provide a unified interface for writting densities to primative and class voxel types.
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// They are conceptually the inverse of the 'convertToDensity' function used by the MarchingCubesSurfaceExtractor. They probably shouldn't be part
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// of PolyVox, but they might be usful to other tests so we cold move them into a 'Tests.h' or something in the future.
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template<typename VoxelType>
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void writeDensityValueToVoxel(int valueToWrite, VoxelType& voxel)
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{
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voxel = valueToWrite;
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}
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template<>
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void writeDensityValueToVoxel(int valueToWrite, Density8& voxel)
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{
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voxel.setDensity(valueToWrite);
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}
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template<>
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void writeDensityValueToVoxel(int valueToWrite, MaterialDensityPair88& voxel)
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{
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voxel.setDensity(valueToWrite);
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}
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template<typename VoxelType>
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void writeMaterialValueToVoxel(int /*valueToWrite*/, VoxelType& /*voxel*/)
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{
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//Most types don't have a material
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return;
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}
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template<>
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void writeMaterialValueToVoxel(int valueToWrite, MaterialDensityPair88& voxel)
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{
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voxel.setMaterial(valueToWrite);
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}
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// Runs the surface extractor for a given type.
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template <typename VoxelType>
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void testForType(SurfaceMesh<PositionMaterialNormal>& result)
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{
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const int32_t uVolumeSideLength = 32;
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//Create empty volume
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SimpleVolume<VoxelType> volData(Region(Vector3DInt32(0,0,0), Vector3DInt32(uVolumeSideLength-1, uVolumeSideLength-1, uVolumeSideLength-1)));
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for (int32_t z = 0; z < uVolumeSideLength; z++)
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{
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for (int32_t y = 0; y < uVolumeSideLength; y++)
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{
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for (int32_t x = 0; x < uVolumeSideLength; x++)
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{
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VoxelType voxelValue;
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//Create a density field which changes throughout the volume.
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writeDensityValueToVoxel<VoxelType>(x + y + z, voxelValue);
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//Two different materials in two halves of the volume
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writeMaterialValueToVoxel<VoxelType>(z > uVolumeSideLength / 2 ? 42 : 79, voxelValue);
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volData.setVoxelAt(x, y, z, voxelValue);
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}
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}
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}
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DefaultMarchingCubesController<VoxelType> controller(50);
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MarchingCubesSurfaceExtractor< SimpleVolume<VoxelType> > extractor(&volData, volData.getEnclosingRegion(), &result, controller);
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extractor.execute();
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}
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void testCustomController(SurfaceMesh<PositionMaterialNormal>& result)
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{
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const int32_t uVolumeSideLength = 32;
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//Create empty volume
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SimpleVolume<float> volData(Region(Vector3DInt32(0,0,0), Vector3DInt32(uVolumeSideLength-1, uVolumeSideLength-1, uVolumeSideLength-1)));
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for (int32_t z = 0; z < uVolumeSideLength; z++)
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{
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for (int32_t y = 0; y < uVolumeSideLength; y++)
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{
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for (int32_t x = 0; x < uVolumeSideLength; x++)
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{
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float voxelValue = x + y + z;
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volData.setVoxelAt(x, y, z, voxelValue);
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}
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}
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}
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CustomMarchingCubesController controller;
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controller.m_tBorder = 0.0f; //Temporary HACK!
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MarchingCubesSurfaceExtractor< SimpleVolume<float>, CustomMarchingCubesController > extractor(&volData, volData.getEnclosingRegion(), &result, controller);
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extractor.execute();
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}
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void TestSurfaceExtractor::testExecute()
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{
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const static uint32_t uExpectedVertices = 4731;
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const static uint32_t uExpectedIndices = 12810;
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const static uint32_t uMaterialToCheck = 3000;
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const static float fExpectedMaterial = 42.0f;
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const static float fNoMaterial = 1.0f;
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SurfaceMesh<PositionMaterialNormal> mesh;
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//Run the test for various voxel types.
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QBENCHMARK {
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testForType<int8_t>(mesh);
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}
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<uint8_t>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<int16_t>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<uint16_t>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<int32_t>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<uint32_t>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<float>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<double>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<Density8>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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testForType<MaterialDensityPair88>(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fExpectedMaterial);
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//Test whether the CustomSurfaceExtractor works.
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testCustomController(mesh);
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QCOMPARE(mesh.getNoOfVertices(), uExpectedVertices);
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QCOMPARE(mesh.getNoOfIndices(), uExpectedIndices);
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QCOMPARE(mesh.getVertices()[uMaterialToCheck].getMaterial(), fNoMaterial);
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}
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QTEST_MAIN(TestSurfaceExtractor)
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