307 lines
17 KiB
C++
307 lines
17 KiB
C++
/*******************************************************************************
|
|
Copyright (c) 2005-2009 David Williams
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
|
|
3. This notice may not be removed or altered from any source
|
|
distribution.
|
|
*******************************************************************************/
|
|
|
|
#include "VoxelFilters.h"
|
|
|
|
#include "LargeVolume.h"
|
|
|
|
namespace PolyVox
|
|
{
|
|
template <typename VoxelType>
|
|
Vector3DFloat computeCentralDifferenceGradient(const typename LargeVolume<VoxelType>::Sampler& volIter)
|
|
{
|
|
//FIXME - bitwise way of doing this?
|
|
VoxelType voxel1nx = volIter.peekVoxel1nx0py0pz() > 0 ? 1: 0;
|
|
VoxelType voxel1px = volIter.peekVoxel1px0py0pz() > 0 ? 1: 0;
|
|
|
|
VoxelType voxel1ny = volIter.peekVoxel0px1ny0pz() > 0 ? 1: 0;
|
|
VoxelType voxel1py = volIter.peekVoxel0px1py0pz() > 0 ? 1: 0;
|
|
|
|
VoxelType voxel1nz = volIter.peekVoxel0px0py1nz() > 0 ? 1: 0;
|
|
VoxelType voxel1pz = volIter.peekVoxel0px0py1pz() > 0 ? 1: 0;
|
|
|
|
return Vector3DFloat
|
|
(
|
|
static_cast<float>(voxel1nx) - static_cast<float>(voxel1px),
|
|
static_cast<float>(voxel1ny) - static_cast<float>(voxel1py),
|
|
static_cast<float>(voxel1nz) - static_cast<float>(voxel1pz)
|
|
);
|
|
}
|
|
|
|
template <typename VoxelType>
|
|
Vector3DFloat computeDecimatedCentralDifferenceGradient(const typename LargeVolume<VoxelType>::Sampler& volIter)
|
|
{
|
|
const int32_t x = volIter.getPosX();
|
|
const int32_t y = volIter.getPosY();
|
|
const int32_t z = volIter.getPosZ();
|
|
|
|
//FIXME - bitwise way of doing this?
|
|
VoxelType voxel1nx = volIter.getVoxelAt(x-2, y ,z ) > 0 ? 1: 0;
|
|
VoxelType voxel1px = volIter.getVoxelAt(x-2, y ,z ) > 0 ? 1: 0;
|
|
|
|
VoxelType voxel1ny = volIter.getVoxelAt(x , y-2,z ) > 0 ? 1: 0;
|
|
VoxelType voxel1py = volIter.getVoxelAt(x , y-2,z ) > 0 ? 1: 0;
|
|
|
|
VoxelType voxel1nz = volIter.getVoxelAt(x , y ,z-2) > 0 ? 1: 0;
|
|
VoxelType voxel1pz = volIter.getVoxelAt(x , y ,z-2) > 0 ? 1: 0;
|
|
|
|
return Vector3DFloat
|
|
(
|
|
static_cast<float>(voxel1nx) - static_cast<float>(voxel1px),
|
|
static_cast<float>(voxel1ny) - static_cast<float>(voxel1py),
|
|
static_cast<float>(voxel1nz) - static_cast<float>(voxel1pz)
|
|
);
|
|
}
|
|
|
|
template <typename VoxelType>
|
|
Vector3DFloat computeSmoothCentralDifferenceGradient(typename LargeVolume<VoxelType>::Sampler& volIter)
|
|
{
|
|
int32_t initialX = volIter.getPosX();
|
|
int32_t initialY = volIter.getPosY();
|
|
int32_t initialZ = volIter.getPosZ();
|
|
|
|
//FIXME - bitwise way of doing this?
|
|
volIter.setPosition(initialX-1, initialY, initialZ);
|
|
float voxel1nx = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY, initialZ);
|
|
float voxel1px = computeSmoothedVoxel(volIter);
|
|
|
|
volIter.setPosition(initialX, initialY-1, initialZ);
|
|
float voxel1ny = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX, initialY+1, initialZ);
|
|
float voxel1py = computeSmoothedVoxel(volIter);
|
|
|
|
volIter.setPosition(initialX, initialY, initialZ-1);
|
|
float voxel1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX, initialY, initialZ+1);
|
|
float voxel1pz = computeSmoothedVoxel(volIter);
|
|
|
|
return Vector3DFloat
|
|
(
|
|
voxel1nx - voxel1px,
|
|
voxel1ny - voxel1py,
|
|
voxel1nz - voxel1pz
|
|
);
|
|
}
|
|
|
|
template <typename VoxelType>
|
|
Vector3DFloat computeSobelGradient(const typename LargeVolume<VoxelType>::Sampler& volIter)
|
|
{
|
|
static const int weights[3][3][3] = { { {2,3,2}, {3,6,3}, {2,3,2} }, {
|
|
{3,6,3}, {6,0,6}, {3,6,3} }, { {2,3,2}, {3,6,3}, {2,3,2} } };
|
|
|
|
const VoxelType pVoxel1nx1ny1nz = volIter.peekVoxel1nx1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1ny0pz = volIter.peekVoxel1nx1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1ny1pz = volIter.peekVoxel1nx1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py1nz = volIter.peekVoxel1nx0py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py0pz = volIter.peekVoxel1nx0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py1pz = volIter.peekVoxel1nx0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py1nz = volIter.peekVoxel1nx1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py0pz = volIter.peekVoxel1nx1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py1pz = volIter.peekVoxel1nx1py1pz() > 0 ? 1: 0;
|
|
|
|
const VoxelType pVoxel0px1ny1nz = volIter.peekVoxel0px1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1ny0pz = volIter.peekVoxel0px1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1ny1pz = volIter.peekVoxel0px1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px0py1nz = volIter.peekVoxel0px0py1nz() > 0 ? 1: 0;
|
|
//const VoxelType pVoxel0px0py0pz = volIter.peekVoxel0px0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px0py1pz = volIter.peekVoxel0px0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py1nz = volIter.peekVoxel0px1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py0pz = volIter.peekVoxel0px1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py1pz = volIter.peekVoxel0px1py1pz() > 0 ? 1: 0;
|
|
|
|
const VoxelType pVoxel1px1ny1nz = volIter.peekVoxel1px1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1ny0pz = volIter.peekVoxel1px1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1ny1pz = volIter.peekVoxel1px1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py1nz = volIter.peekVoxel1px0py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py0pz = volIter.peekVoxel1px0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py1pz = volIter.peekVoxel1px0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py1nz = volIter.peekVoxel1px1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py0pz = volIter.peekVoxel1px1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py1pz = volIter.peekVoxel1px1py1pz() > 0 ? 1: 0;
|
|
|
|
const int xGrad(- weights[0][0][0] * pVoxel1nx1ny1nz -
|
|
weights[1][0][0] * pVoxel1nx1ny0pz - weights[2][0][0] *
|
|
pVoxel1nx1ny1pz - weights[0][1][0] * pVoxel1nx0py1nz -
|
|
weights[1][1][0] * pVoxel1nx0py0pz - weights[2][1][0] *
|
|
pVoxel1nx0py1pz - weights[0][2][0] * pVoxel1nx1py1nz -
|
|
weights[1][2][0] * pVoxel1nx1py0pz - weights[2][2][0] *
|
|
pVoxel1nx1py1pz + weights[0][0][2] * pVoxel1px1ny1nz +
|
|
weights[1][0][2] * pVoxel1px1ny0pz + weights[2][0][2] *
|
|
pVoxel1px1ny1pz + weights[0][1][2] * pVoxel1px0py1nz +
|
|
weights[1][1][2] * pVoxel1px0py0pz + weights[2][1][2] *
|
|
pVoxel1px0py1pz + weights[0][2][2] * pVoxel1px1py1nz +
|
|
weights[1][2][2] * pVoxel1px1py0pz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
const int yGrad(- weights[0][0][0] * pVoxel1nx1ny1nz -
|
|
weights[1][0][0] * pVoxel1nx1ny0pz - weights[2][0][0] *
|
|
pVoxel1nx1ny1pz + weights[0][2][0] * pVoxel1nx1py1nz +
|
|
weights[1][2][0] * pVoxel1nx1py0pz + weights[2][2][0] *
|
|
pVoxel1nx1py1pz - weights[0][0][1] * pVoxel0px1ny1nz -
|
|
weights[1][0][1] * pVoxel0px1ny0pz - weights[2][0][1] *
|
|
pVoxel0px1ny1pz + weights[0][2][1] * pVoxel0px1py1nz +
|
|
weights[1][2][1] * pVoxel0px1py0pz + weights[2][2][1] *
|
|
pVoxel0px1py1pz - weights[0][0][2] * pVoxel1px1ny1nz -
|
|
weights[1][0][2] * pVoxel1px1ny0pz - weights[2][0][2] *
|
|
pVoxel1px1ny1pz + weights[0][2][2] * pVoxel1px1py1nz +
|
|
weights[1][2][2] * pVoxel1px1py0pz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
const int zGrad(- weights[0][0][0] * pVoxel1nx1ny1nz +
|
|
weights[2][0][0] * pVoxel1nx1ny1pz - weights[0][1][0] *
|
|
pVoxel1nx0py1nz + weights[2][1][0] * pVoxel1nx0py1pz -
|
|
weights[0][2][0] * pVoxel1nx1py1nz + weights[2][2][0] *
|
|
pVoxel1nx1py1pz - weights[0][0][1] * pVoxel0px1ny1nz +
|
|
weights[2][0][1] * pVoxel0px1ny1pz - weights[0][1][1] *
|
|
pVoxel0px0py1nz + weights[2][1][1] * pVoxel0px0py1pz -
|
|
weights[0][2][1] * pVoxel0px1py1nz + weights[2][2][1] *
|
|
pVoxel0px1py1pz - weights[0][0][2] * pVoxel1px1ny1nz +
|
|
weights[2][0][2] * pVoxel1px1ny1pz - weights[0][1][2] *
|
|
pVoxel1px0py1nz + weights[2][1][2] * pVoxel1px0py1pz -
|
|
weights[0][2][2] * pVoxel1px1py1nz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
//Note: The above actually give gradients going from low density to high density.
|
|
//For our normals we want the the other way around, so we switch the components as we return them.
|
|
return Vector3DFloat(static_cast<float>(-xGrad),static_cast<float>(-yGrad),static_cast<float>(-zGrad));
|
|
}
|
|
|
|
template <typename VoxelType>
|
|
Vector3DFloat computeSmoothSobelGradient(typename LargeVolume<VoxelType>::Sampler& volIter)
|
|
{
|
|
static const int weights[3][3][3] = { { {2,3,2}, {3,6,3}, {2,3,2} }, {
|
|
{3,6,3}, {6,0,6}, {3,6,3} }, { {2,3,2}, {3,6,3}, {2,3,2} } };
|
|
|
|
int32_t initialX = volIter.getPosX();
|
|
int32_t initialY = volIter.getPosY();
|
|
int32_t initialZ = volIter.getPosZ();
|
|
|
|
volIter.setPosition(initialX-1, initialY-1, initialZ-1); const float pVoxel1nx1ny1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY-1, initialZ ); const float pVoxel1nx1ny0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY-1, initialZ+1); const float pVoxel1nx1ny1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY , initialZ-1); const float pVoxel1nx0py1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY , initialZ ); const float pVoxel1nx0py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY , initialZ+1); const float pVoxel1nx0py1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY+1, initialZ-1); const float pVoxel1nx1py1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY+1, initialZ ); const float pVoxel1nx1py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX-1, initialY+1, initialZ+1); const float pVoxel1nx1py1pz = computeSmoothedVoxel(volIter);
|
|
|
|
volIter.setPosition(initialX , initialY-1, initialZ-1); const float pVoxel0px1ny1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY-1, initialZ ); const float pVoxel0px1ny0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY-1, initialZ+1); const float pVoxel0px1ny1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY , initialZ-1); const float pVoxel0px0py1nz = computeSmoothedVoxel(volIter);
|
|
//volIter.setPosition(initialX , initialY , initialZ ); const float pVoxel0px0py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY , initialZ+1); const float pVoxel0px0py1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY+1, initialZ-1); const float pVoxel0px1py1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY+1, initialZ ); const float pVoxel0px1py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX , initialY+1, initialZ+1); const float pVoxel0px1py1pz = computeSmoothedVoxel(volIter);
|
|
|
|
volIter.setPosition(initialX+1, initialY-1, initialZ-1); const float pVoxel1px1ny1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY-1, initialZ ); const float pVoxel1px1ny0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY-1, initialZ+1); const float pVoxel1px1ny1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY , initialZ-1); const float pVoxel1px0py1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY , initialZ ); const float pVoxel1px0py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY , initialZ+1); const float pVoxel1px0py1pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY+1, initialZ-1); const float pVoxel1px1py1nz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY+1, initialZ ); const float pVoxel1px1py0pz = computeSmoothedVoxel(volIter);
|
|
volIter.setPosition(initialX+1, initialY+1, initialZ+1); const float pVoxel1px1py1pz = computeSmoothedVoxel(volIter);
|
|
|
|
/*const VoxelType pVoxel1nx1ny1nz = volIter.peekVoxel1nx1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1ny0pz = volIter.peekVoxel1nx1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1ny1pz = volIter.peekVoxel1nx1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py1nz = volIter.peekVoxel1nx0py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py0pz = volIter.peekVoxel1nx0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx0py1pz = volIter.peekVoxel1nx0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py1nz = volIter.peekVoxel1nx1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py0pz = volIter.peekVoxel1nx1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1nx1py1pz = volIter.peekVoxel1nx1py1pz() > 0 ? 1: 0;
|
|
|
|
const VoxelType pVoxel0px1ny1nz = volIter.peekVoxel0px1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1ny0pz = volIter.peekVoxel0px1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1ny1pz = volIter.peekVoxel0px1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px0py1nz = volIter.peekVoxel0px0py1nz() > 0 ? 1: 0;
|
|
//const VoxelType pVoxel0px0py0pz = volIter.peekVoxel0px0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px0py1pz = volIter.peekVoxel0px0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py1nz = volIter.peekVoxel0px1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py0pz = volIter.peekVoxel0px1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel0px1py1pz = volIter.peekVoxel0px1py1pz() > 0 ? 1: 0;
|
|
|
|
const VoxelType pVoxel1px1ny1nz = volIter.peekVoxel1px1ny1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1ny0pz = volIter.peekVoxel1px1ny0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1ny1pz = volIter.peekVoxel1px1ny1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py1nz = volIter.peekVoxel1px0py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py0pz = volIter.peekVoxel1px0py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px0py1pz = volIter.peekVoxel1px0py1pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py1nz = volIter.peekVoxel1px1py1nz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py0pz = volIter.peekVoxel1px1py0pz() > 0 ? 1: 0;
|
|
const VoxelType pVoxel1px1py1pz = volIter.peekVoxel1px1py1pz() > 0 ? 1: 0;*/
|
|
|
|
const float xGrad(- weights[0][0][0] * pVoxel1nx1ny1nz -
|
|
weights[1][0][0] * pVoxel1nx1ny0pz - weights[2][0][0] *
|
|
pVoxel1nx1ny1pz - weights[0][1][0] * pVoxel1nx0py1nz -
|
|
weights[1][1][0] * pVoxel1nx0py0pz - weights[2][1][0] *
|
|
pVoxel1nx0py1pz - weights[0][2][0] * pVoxel1nx1py1nz -
|
|
weights[1][2][0] * pVoxel1nx1py0pz - weights[2][2][0] *
|
|
pVoxel1nx1py1pz + weights[0][0][2] * pVoxel1px1ny1nz +
|
|
weights[1][0][2] * pVoxel1px1ny0pz + weights[2][0][2] *
|
|
pVoxel1px1ny1pz + weights[0][1][2] * pVoxel1px0py1nz +
|
|
weights[1][1][2] * pVoxel1px0py0pz + weights[2][1][2] *
|
|
pVoxel1px0py1pz + weights[0][2][2] * pVoxel1px1py1nz +
|
|
weights[1][2][2] * pVoxel1px1py0pz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
const float yGrad(- weights[0][0][0] * pVoxel1nx1ny1nz -
|
|
weights[1][0][0] * pVoxel1nx1ny0pz - weights[2][0][0] *
|
|
pVoxel1nx1ny1pz + weights[0][2][0] * pVoxel1nx1py1nz +
|
|
weights[1][2][0] * pVoxel1nx1py0pz + weights[2][2][0] *
|
|
pVoxel1nx1py1pz - weights[0][0][1] * pVoxel0px1ny1nz -
|
|
weights[1][0][1] * pVoxel0px1ny0pz - weights[2][0][1] *
|
|
pVoxel0px1ny1pz + weights[0][2][1] * pVoxel0px1py1nz +
|
|
weights[1][2][1] * pVoxel0px1py0pz + weights[2][2][1] *
|
|
pVoxel0px1py1pz - weights[0][0][2] * pVoxel1px1ny1nz -
|
|
weights[1][0][2] * pVoxel1px1ny0pz - weights[2][0][2] *
|
|
pVoxel1px1ny1pz + weights[0][2][2] * pVoxel1px1py1nz +
|
|
weights[1][2][2] * pVoxel1px1py0pz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
const float zGrad(- weights[0][0][0] * pVoxel1nx1ny1nz +
|
|
weights[2][0][0] * pVoxel1nx1ny1pz - weights[0][1][0] *
|
|
pVoxel1nx0py1nz + weights[2][1][0] * pVoxel1nx0py1pz -
|
|
weights[0][2][0] * pVoxel1nx1py1nz + weights[2][2][0] *
|
|
pVoxel1nx1py1pz - weights[0][0][1] * pVoxel0px1ny1nz +
|
|
weights[2][0][1] * pVoxel0px1ny1pz - weights[0][1][1] *
|
|
pVoxel0px0py1nz + weights[2][1][1] * pVoxel0px0py1pz -
|
|
weights[0][2][1] * pVoxel0px1py1nz + weights[2][2][1] *
|
|
pVoxel0px1py1pz - weights[0][0][2] * pVoxel1px1ny1nz +
|
|
weights[2][0][2] * pVoxel1px1ny1pz - weights[0][1][2] *
|
|
pVoxel1px0py1nz + weights[2][1][2] * pVoxel1px0py1pz -
|
|
weights[0][2][2] * pVoxel1px1py1nz + weights[2][2][2] *
|
|
pVoxel1px1py1pz);
|
|
|
|
//Note: The above actually give gradients going from low density to high density.
|
|
//For our normals we want the the other way around, so we switch the components as we return them.
|
|
return Vector3DFloat(-xGrad,-yGrad,-zGrad);
|
|
}
|
|
}
|