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Added support for getting interpolated voxel value.

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This commit is contained in:
David Williams 2012-12-16 18:04:33 +01:00
parent 342efec3fa
commit 8473b1e3e6
3 changed files with 43 additions and 2 deletions
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4
library/PolyVoxCore/include/PolyVoxCore/Impl/Utility.h
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@ -40,12 +40,12 @@ namespace PolyVox
inline int32_t roundTowardsNegInf(float r)
{
return (r > 0.0) ? static_cast<int32_t>(r) : static_cast<int32_t>(r - 1.0f);
return (r >= 0.0) ? static_cast<int32_t>(r) : static_cast<int32_t>(r - 1.0f);
}
inline int32_t roundToNearestInteger(float r)
{
return (r > 0.0) ? static_cast<int32_t>(r + 0.5f) : static_cast<int32_t>(r - 0.5f);
return (r >= 0.0) ? static_cast<int32_t>(r + 0.5f) : static_cast<int32_t>(r - 0.5f);
}
template <typename Type>

2
library/PolyVoxCore/include/PolyVoxCore/RawVolume.h
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@ -117,6 +117,8 @@ namespace PolyVox
/// Destructor
~RawVolume();
VoxelType getInterpolatedValue(float fXPos, float fYPos, float fZPos); //Should be const
VoxelType getInterpolatedValue(const Vector3DFloat& v3dPos); //Should be const
/// Gets a voxel at the position given by <tt>x,y,z</tt> coordinates
VoxelType getVoxel(int32_t uXPos, int32_t uYPos, int32_t uZPos) const;
/// Gets a voxel at the position given by a 3D vector

39
library/PolyVoxCore/include/PolyVoxCore/RawVolume.inl
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@ -73,6 +73,45 @@ namespace PolyVox
assert(false); // See function comment above.
}
template <typename VoxelType>
VoxelType RawVolume<VoxelType>::getInterpolatedValue(float fXPos, float fYPos, float fZPos) //Should be const
{
Sampler sampler(this);
int32_t iLowerX = roundTowardsNegInf(fXPos);
int32_t iLowerY = roundTowardsNegInf(fYPos);
int32_t iLowerZ = roundTowardsNegInf(fZPos);
float fOffsetX = fXPos - iLowerX;
float fOffsetY = fYPos - iLowerY;
float fOffsetZ = fZPos - iLowerZ;
/*int32_t iCeilX = iFloorX + 1;
int32_t iCeilY = iFloorY + 1;
int32_t iCeilZ = iFloorZ + 1;*/
sampler.setPosition(iLowerX, iLowerY, iLowerZ);
VoxelType v000 = sampler.peekVoxel0px0py0pz();
VoxelType v100 = sampler.peekVoxel1px0py0pz();
VoxelType v010 = sampler.peekVoxel0px1py0pz();
VoxelType v110 = sampler.peekVoxel1px1py0pz();
VoxelType v001 = sampler.peekVoxel0px0py1pz();
VoxelType v101 = sampler.peekVoxel1px0py1pz();
VoxelType v011 = sampler.peekVoxel0px1py1pz();
VoxelType v111 = sampler.peekVoxel1px1py1pz();
VoxelType result = trilerp(v000, v100, v010, v110, v001, v101, v011, v111, fOffsetX, fOffsetY, fOffsetZ);
return result;
}
template <typename VoxelType>
VoxelType RawVolume<VoxelType>::getInterpolatedValue(const Vector3DFloat& v3dPos) //Should be const
{
return getInterpolatedValue(v3dPos.getX(), v3dPos.getY(), v3dPos.getZ());
}
////////////////////////////////////////////////////////////////////////////////
/// \param uXPos The \c x position of the voxel
/// \param uYPos The \c y position of the voxel