334 lines
13 KiB
C++
334 lines
13 KiB
C++
#pragma region License
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/******************************************************************************
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This file is part of the PolyVox library
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Copyright (C) 2006 David Williams
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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******************************************************************************/
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#pragma endregion
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#include "PolyVoxCore/PolyVoxImpl/ReferenceSurfaceExtractor.h"
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#include "PolyVoxCore/Volume.h"
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#include "PolyVoxCore/VolumeIterator.h"
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#include "PolyVoxCore/IndexedSurfacePatch.h"
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#include "PolyVoxCore/PolyVoxImpl/MarchingCubesTables.h"
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#include "PolyVoxCore/Region.h"
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#include "PolyVoxCore/SurfaceVertex.h"
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#include "PolyVoxCore/Vector.h"
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namespace PolyVox
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{
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void extractReferenceSurfaceImpl(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch)
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{
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/*static int32_t vertexIndicesX[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
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static int32_t vertexIndicesY[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
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static int32_t vertexIndicesZ[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];*/
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Vector3DInt32 regionDimensions = region.dimensions() + Vector3DInt32(1,1,1);
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std::vector<int32_t> vertexIndicesX(regionDimensions.getX() * regionDimensions.getY() * regionDimensions.getZ());
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std::vector<int32_t> vertexIndicesY(regionDimensions.getX() * regionDimensions.getY() * regionDimensions.getZ());
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std::vector<int32_t> vertexIndicesZ(regionDimensions.getX() * regionDimensions.getY() * regionDimensions.getZ());
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memset(&vertexIndicesX[0],0xFF,sizeof(vertexIndicesX[0]) * vertexIndicesX.size()); //0xFF is -1 as two's complement - this may not be portable...
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memset(&vertexIndicesY[0],0xFF,sizeof(vertexIndicesY[0]) * vertexIndicesY.size()); //FIXME - can we just use sizeof(vertexIndicesY)?
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memset(&vertexIndicesZ[0],0xFF,sizeof(vertexIndicesZ[0]) * vertexIndicesZ.size());
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//When generating the mesh for a region we actually look one voxel outside it in the
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// back, bottom, right direction. Protect against access violations by cropping region here
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Region regVolume = volumeData->getEnclosingRegion();
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//regVolume.setUpperCorner(regVolume.getUpperCorner() - Vector3DInt32(1,1,1));
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region.cropTo(regVolume);
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region.setUpperCorner(region.getUpperCorner() - Vector3DInt32(1,1,1));
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//Offset from lower block corner
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const Vector3DFloat offset = static_cast<Vector3DFloat>(region.getLowerCorner());
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Vector3DFloat vertlist[12];
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Vector3DFloat normlist[12];
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uint8_t vertMaterials[12];
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VolumeIterator<uint8_t> volIter(*volumeData);
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volIter.setValidRegion(region);
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//////////////////////////////////////////////////////////////////////////
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//Get mesh data
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//////////////////////////////////////////////////////////////////////////
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//Iterate over each cell in the region
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volIter.setPosition(region.getLowerCorner().getX(),region.getLowerCorner().getY(), region.getLowerCorner().getZ());
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while(volIter.moveForwardInRegionXYZ())
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{
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//Current position
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const uint16_t x = volIter.getPosX();
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const uint16_t y = volIter.getPosY();
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const uint16_t z = volIter.getPosZ();
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//Voxels values
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const uint8_t v000 = volIter.getVoxel();
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const uint8_t v100 = volIter.peekVoxel1px0py0pz();
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const uint8_t v010 = volIter.peekVoxel0px1py0pz();
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const uint8_t v110 = volIter.peekVoxel1px1py0pz();
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const uint8_t v001 = volIter.peekVoxel0px0py1pz();
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const uint8_t v101 = volIter.peekVoxel1px0py1pz();
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const uint8_t v011 = volIter.peekVoxel0px1py1pz();
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const uint8_t v111 = volIter.peekVoxel1px1py1pz();
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//Determine the index into the edge table which tells us which vertices are inside of the surface
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uint8_t iCubeIndex = 0;
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if (v000 == 0) iCubeIndex |= 1;
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if (v100 == 0) iCubeIndex |= 2;
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if (v110 == 0) iCubeIndex |= 4;
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if (v010 == 0) iCubeIndex |= 8;
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if (v001 == 0) iCubeIndex |= 16;
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if (v101 == 0) iCubeIndex |= 32;
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if (v111 == 0) iCubeIndex |= 64;
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if (v011 == 0) iCubeIndex |= 128;
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/* Cube is entirely in/out of the surface */
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if (edgeTable[iCubeIndex] == 0)
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{
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continue;
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}
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/* Find the vertices where the surface intersects the cube */
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if (edgeTable[iCubeIndex] & 1)
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{
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vertlist[0].setX(x + 0.5f);
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vertlist[0].setY(y);
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vertlist[0].setZ(z);
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normlist[0].setX(v000 > v100 ? 1.0f : -1.0f);
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normlist[0].setY(0.0f);
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normlist[0].setZ(0.0f);
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vertMaterials[0] = v000 | v100; //Because one of these is 0, the or operation takes the max.
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}
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if (edgeTable[iCubeIndex] & 2)
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{
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vertlist[1].setX(x + 1.0f);
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vertlist[1].setY(y + 0.5f);
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vertlist[1].setZ(z);
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normlist[1].setX(0.0f);
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normlist[1].setY(v100 > v110 ? 1.0f : -1.0f);
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normlist[1].setZ(0.0f);
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vertMaterials[1] = v100 | v110;
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}
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if (edgeTable[iCubeIndex] & 4)
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{
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vertlist[2].setX(x + 0.5f);
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vertlist[2].setY(y + 1.0f);
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vertlist[2].setZ(z);
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normlist[2].setX(v010 > v110 ? 1.0f : -1.0f);
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normlist[2].setY(0.0f);
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normlist[2].setZ(0.0f);
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vertMaterials[2] = v010 | v110;
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}
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if (edgeTable[iCubeIndex] & 8)
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{
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vertlist[3].setX(x);
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vertlist[3].setY(y + 0.5f);
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vertlist[3].setZ(z);
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normlist[3].setX(0.0f);
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normlist[3].setY(v000 > v010 ? 1.0f : -1.0f);
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normlist[3].setZ(0.0f);
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vertMaterials[3] = v000 | v010;
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}
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if (edgeTable[iCubeIndex] & 16)
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{
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vertlist[4].setX(x + 0.5f);
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vertlist[4].setY(y);
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vertlist[4].setZ(z + 1.0f);
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normlist[4].setX(v001 > v101 ? 1.0f : -1.0f);
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normlist[4].setY(0.0f);
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normlist[4].setZ(0.0f);
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vertMaterials[4] = v001 | v101;
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}
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if (edgeTable[iCubeIndex] & 32)
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{
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vertlist[5].setX(x + 1.0f);
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vertlist[5].setY(y + 0.5f);
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vertlist[5].setZ(z + 1.0f);
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normlist[5].setX(0.0f);
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normlist[5].setY(v101 > v111 ? 1.0f : -1.0f);
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normlist[5].setZ(0.0f);
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vertMaterials[5] = v101 | v111;
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}
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if (edgeTable[iCubeIndex] & 64)
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{
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vertlist[6].setX(x + 0.5f);
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vertlist[6].setY(y + 1.0f);
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vertlist[6].setZ(z + 1.0f);
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normlist[6].setX(v011 > v111 ? 1.0f : -1.0f);
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normlist[6].setY(0.0f);
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normlist[6].setZ(0.0f);
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vertMaterials[6] = v011 | v111;
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}
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if (edgeTable[iCubeIndex] & 128)
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{
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vertlist[7].setX(x);
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vertlist[7].setY(y + 0.5f);
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vertlist[7].setZ(z + 1.0f);
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normlist[7].setX(0.0f);
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normlist[7].setY(v001 > v011 ? 1.0f : -1.0f);
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normlist[7].setZ(0.0f);
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vertMaterials[7] = v001 | v011;
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}
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if (edgeTable[iCubeIndex] & 256)
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{
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vertlist[8].setX(x);
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vertlist[8].setY(y);
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vertlist[8].setZ(z + 0.5f);
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normlist[8].setX(0.0f);
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normlist[8].setY(0.0f);
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normlist[8].setZ(v000 > v001 ? 1.0f : -1.0f);
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vertMaterials[8] = v000 | v001;
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}
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if (edgeTable[iCubeIndex] & 512)
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{
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vertlist[9].setX(x + 1.0f);
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vertlist[9].setY(y);
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vertlist[9].setZ(z + 0.5f);
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normlist[9].setX(0.0f);
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normlist[9].setY(0.0f);
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normlist[9].setZ(v100 > v101 ? 1.0f : -1.0f);
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vertMaterials[9] = v100 | v101;
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}
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if (edgeTable[iCubeIndex] & 1024)
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{
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vertlist[10].setX(x + 1.0f);
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vertlist[10].setY(y + 1.0f);
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vertlist[10].setZ(z + 0.5f);
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normlist[10].setX(0.0f);
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normlist[10].setY(0.0f);
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normlist[10].setZ(v110 > v111 ? 1.0f : -1.0f);
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vertMaterials[10] = v110 | v111;
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}
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if (edgeTable[iCubeIndex] & 2048)
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{
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vertlist[11].setX(x);
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vertlist[11].setY(y + 1.0f);
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vertlist[11].setZ(z + 0.5f);
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normlist[11].setX(0.0f);
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normlist[11].setY(0.0f);
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normlist[11].setZ(v010 > v011 ? 1.0f : -1.0f);
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vertMaterials[11] = v010 | v011;
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}
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for (int i=0;triTable[iCubeIndex][i]!=-1;i+=3)
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{
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//The three vertices forming a triangle
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const Vector3DFloat vertex0 = vertlist[triTable[iCubeIndex][i ]] - offset;
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const Vector3DFloat vertex1 = vertlist[triTable[iCubeIndex][i+1]] - offset;
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const Vector3DFloat vertex2 = vertlist[triTable[iCubeIndex][i+2]] - offset;
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const Vector3DFloat normal0 = normlist[triTable[iCubeIndex][i ]];
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const Vector3DFloat normal1 = normlist[triTable[iCubeIndex][i+1]];
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const Vector3DFloat normal2 = normlist[triTable[iCubeIndex][i+2]];
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//Cast to floats and divide by two.
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//const Vector3DFloat vertex0AsFloat = (static_cast<Vector3DFloat>(vertex0) / 2.0f) - offset;
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//const Vector3DFloat vertex1AsFloat = (static_cast<Vector3DFloat>(vertex1) / 2.0f) - offset;
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//const Vector3DFloat vertex2AsFloat = (static_cast<Vector3DFloat>(vertex2) / 2.0f) - offset;
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const uint8_t material0 = vertMaterials[triTable[iCubeIndex][i ]];
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const uint8_t material1 = vertMaterials[triTable[iCubeIndex][i+1]];
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const uint8_t material2 = vertMaterials[triTable[iCubeIndex][i+2]];
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//If all the materials are the same, we just need one triangle for that material with all the alphas set high.
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SurfaceVertex v0(vertex0, normal0, material0 + 0.1f);
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SurfaceVertex v1(vertex1, normal1, material1 + 0.1f);
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SurfaceVertex v2(vertex2, normal2, material2 + 0.1f);
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int32_t index0 = getIndexFor(v0.getPosition(), regionDimensions, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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if(index0 == -1)
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{
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index0 = singleMaterialPatch->addVertex(v0);
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setIndexFor(v0.getPosition(), regionDimensions, index0, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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}
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int32_t index1 = getIndexFor(v1.getPosition(), regionDimensions, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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if(index1 == -1)
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{
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index1 = singleMaterialPatch->addVertex(v1);
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setIndexFor(v1.getPosition(), regionDimensions, index1, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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}
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int32_t index2 = getIndexFor(v2.getPosition(), regionDimensions, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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if(index2 == -1)
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{
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index2 = singleMaterialPatch->addVertex(v2);
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setIndexFor(v2.getPosition(), regionDimensions, index2, vertexIndicesX, vertexIndicesY, vertexIndicesZ);
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}
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singleMaterialPatch->addTriangle(index0, index1, index2);
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}//For each triangle
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}//For each cell
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}
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int32_t getIndexFor(const Vector3DFloat& pos, const Vector3DInt32& regionDimensions, const std::vector<int32_t>& vertexIndicesX, const std::vector<int32_t>& vertexIndicesY, const std::vector<int32_t>& vertexIndicesZ)
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{
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float xIntPartAsFloat;
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float xFracPart = std::modf(pos.getX(), &xIntPartAsFloat);
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float yIntPartAsFloat;
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float yFracPart = std::modf(pos.getY(), &yIntPartAsFloat);
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float zIntPartAsFloat;
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float zFracPart = std::modf(pos.getZ(), &zIntPartAsFloat);
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uint16_t xIntPart = static_cast<uint16_t>(xIntPartAsFloat);
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uint16_t yIntPart = static_cast<uint16_t>(yIntPartAsFloat);
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uint16_t zIntPart = static_cast<uint16_t>(zIntPartAsFloat);
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//Of all the fractional parts, two should be zero and one should be 0.5.
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if(xFracPart > 0.25f)
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{
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return vertexIndicesX[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()];
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}
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if(yFracPart > 0.25f)
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{
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return vertexIndicesY[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()];
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}
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if(zFracPart > 0.25f)
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{
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return vertexIndicesZ[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()];
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}
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}
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void setIndexFor(const Vector3DFloat& pos, const Vector3DInt32& regionDimensions, int32_t newIndex, std::vector<int32_t>& vertexIndicesX, std::vector<int32_t>& vertexIndicesY, std::vector<int32_t>& vertexIndicesZ)
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{
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float xIntPartAsFloat;
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float xFracPart = std::modf(pos.getX(), &xIntPartAsFloat);
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float yIntPartAsFloat;
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float yFracPart = std::modf(pos.getY(), &yIntPartAsFloat);
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float zIntPartAsFloat;
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float zFracPart = std::modf(pos.getZ(), &zIntPartAsFloat);
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uint16_t xIntPart = static_cast<uint16_t>(xIntPartAsFloat);
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uint16_t yIntPart = static_cast<uint16_t>(yIntPartAsFloat);
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uint16_t zIntPart = static_cast<uint16_t>(zIntPartAsFloat);
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//Of all the fractional parts, two should be zero and one should be 0.5.
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if(xFracPart > 0.25f)
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{
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vertexIndicesX[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()] = newIndex;
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}
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if(yFracPart > 0.25f)
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{
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vertexIndicesY[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()] = newIndex;
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}
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if(zFracPart > 0.25f)
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{
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vertexIndicesZ[xIntPart + yIntPart * regionDimensions.getX() + zIntPart * regionDimensions.getX() * regionDimensions.getY()] = newIndex;
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}
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}
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} |