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Work on improving mesh decimation.

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This commit is contained in:
David Williams 2008-06-27 16:44:18 +00:00
parent 27f6e461c0
commit b990efce24
3 changed files with 83 additions and 2 deletions
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1
PolyVoxCore/include/SurfaceAdjusters.h
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@ -33,6 +33,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
namespace PolyVox
{
POLYVOX_API void smoothRegionGeometry(BlockVolume<std::uint8_t>* volumeData, RegionGeometry& regGeom);
POLYVOX_API void adjustDecimatedGeometry(BlockVolume<std::uint8_t>* volumeData, RegionGeometry& regGeom, std::uint8_t val);
}
#endif

74
PolyVoxCore/source/SurfaceAdjusters.cpp
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@ -9,6 +9,8 @@
#include <vector>
using namespace std;
namespace PolyVox
{
void smoothRegionGeometry(BlockVolume<std::uint8_t>* volumeData, RegionGeometry& regGeom)
@ -74,4 +76,76 @@ namespace PolyVox
++iterSurfaceVertex;
} //while(iterSurfaceVertex != vecVertices.end())
}
void adjustDecimatedGeometry(BlockVolume<std::uint8_t>* volumeData, RegionGeometry& regGeom, uint8_t val)
{
BlockVolumeIterator<std::uint8_t> volIter(*volumeData);
std::vector<SurfaceVertex>& vecVertices = regGeom.m_patchSingleMaterial->m_vecVertices;
std::vector<SurfaceVertex>::iterator iterSurfaceVertex = vecVertices.begin();
while(iterSurfaceVertex != vecVertices.end())
{
Vector3DFloat v3dPos = iterSurfaceVertex->getPosition() + static_cast<Vector3DFloat>(regGeom.m_v3dRegionPosition);
Vector3DInt32 v3dFloor = static_cast<Vector3DInt32>(v3dPos);
BlockVolumeIterator<std::uint8_t> volIter(*volumeData);
//Check all corners are within the volume, allowing a boundary for gradient estimation
bool lowerCornerInside = volumeData->containsPoint(v3dFloor,1);
bool upperCornerInside = volumeData->containsPoint(v3dFloor+Vector3DInt32(1,1,1),1);
if(lowerCornerInside && upperCornerInside) //If this test fails the vertex will be left as it was
{
//volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor));
//const uint8_t uFloor = volIter.getVoxel();
if(((v3dPos.getX() - v3dFloor.getX()) < 0.001) && ((v3dPos.getY() - v3dFloor.getY()) < 0.001) && ((v3dPos.getZ() - v3dFloor.getZ()) < 0.001))
//int x = v3dPos.getX();
//if(x % 2 != 0)
//if((iterSurfaceVertex->getNormal().getX() > 0.5f) || (iterSurfaceVertex->getNormal().getX() < -0.5f))
{
//exit(0);
//volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor+Vector3DInt32(1,0,0)));
//const uint8_t uCeil = volIter.getVoxel();
//if(uFloor == uCeil) //In this case they must both be zero
{
//if(iterSurfaceVertex->getNormal().getX() > 0)
{
iterSurfaceVertex->setPosition(iterSurfaceVertex->getPosition() - iterSurfaceVertex->getNormal() * 0.5f);
v3dPos = iterSurfaceVertex->getPosition() + static_cast<Vector3DFloat>(regGeom.m_v3dRegionPosition);
v3dFloor = static_cast<Vector3DInt32>(v3dPos);
volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor));
const uint8_t uFloor = volIter.getVoxel();
uint8_t uCeil;
if((iterSurfaceVertex->getNormal().getX() > 0.5f) || (iterSurfaceVertex->getNormal().getX() < -0.5f))
{
volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor+Vector3DInt32(1,0,0)));
uCeil = volIter.getVoxel();
}
if((iterSurfaceVertex->getNormal().getY() > 0.5f) || (iterSurfaceVertex->getNormal().getY() < -0.5f))
{
volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor+Vector3DInt32(0,1,0)));
uCeil = volIter.getVoxel();
}
if((iterSurfaceVertex->getNormal().getZ() > 0.5f) || (iterSurfaceVertex->getNormal().getZ() < -0.5f))
{
volIter.setPosition(static_cast<Vector3DInt16>(v3dFloor+Vector3DInt32(0,0,1)));
uCeil = volIter.getVoxel();
}
if(uFloor == uCeil)
{
//NOTE: The normal should actually be multiplied by 1.0f. This works
//for the simple cube but causes depth fighting on more complex shapes.
iterSurfaceVertex->setPosition(iterSurfaceVertex->getPosition() - iterSurfaceVertex->getNormal() * 0.5f);
}
}
}
}
}
++iterSurfaceVertex;
} //while(iterSurfaceVertex != vecVertices.end())
}
}

10
PolyVoxCore/source/SurfaceExtractors.cpp
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@ -37,9 +37,15 @@ namespace PolyVox
//for(int ct = 0; ct < 2; ct++)
Vector3DInt32 temp = regionGeometry.m_v3dRegionPosition;
//temp /= 16;
if(temp.getX() % 32 == 0)
if(temp.getY() % 32 == 0)
{
smoothRegionGeometry(volume.getVolumeData(), regionGeometry);
//smoothRegionGeometry(volume.getVolumeData(), regionGeometry);
generateDecimatedMeshDataForRegion(volume.getVolumeData(), 0, *iterChangedRegions, regionGeometry.m_patchSingleMaterial);
}
else
{
generateDecimatedMeshDataForRegion(volume.getVolumeData(), 1, *iterChangedRegions, regionGeometry.m_patchSingleMaterial);
//adjustDecimatedGeometry(volume.getVolumeData(), regionGeometry, 1);
}
//computeNormalsForVertices(volume.getVolumeData(), regionGeometry, CENTRAL_DIFFERENCE);