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Work on mesh decimation.

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This commit is contained in:
David Williams
2007-09-23 16:17:18 +00:00
parent bcb530942a
commit 9121f39853
3 changed files with 133 additions and 6 deletions
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1
include/SurfacePatch.h
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@ -49,6 +49,7 @@ namespace Ogre
std::list<SurfaceVertexIterator> findConnectedVertices(SurfaceVertexIterator vertexIter, bool& isEdge);
bool decimateOneVertex(void);
void triangulate(std::list<SurfaceVertexIterator> listVertices);
bool isPolygonConvex(std::list<SurfaceVertexIterator> listVertices);
UIntVector3 m_v3dOffset;

2
source/PolyVoxSceneManager.cpp
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@ -1010,7 +1010,7 @@ namespace Ogre
iterPatch->second.computeNormalsFromVolume(volIter);
iterPatch->second.endDefinition();
bool removedVertex = false;
//for(uint ct = 0; ct < 3; ct++)
//for(uint ct = 0; ct < 7; ct++)
do
{
removedVertex = iterPatch->second.decimateOneVertex();

136
source/SurfacePatch.cpp
View File

@ -275,19 +275,25 @@ namespace Ogre
edgeIter = iterTriangles->edge;
//LogManager::getSingleton().logMessage("Edge Target " + StringConverter::toString(edgeIter->target->position.x) + "," + StringConverter::toString(edgeIter->target->position.y) + "," + StringConverter::toString(edgeIter->target->position.z));
iterVertex = find(vertexData.begin(), vertexData.end(), *(edgeIter->target));
Vector3 v0 = (*(edgeIter->target)).position.toOgreVector3();
LogManager::getSingleton().logMessage("");
LogManager::getSingleton().logMessage(" " + StringConverter::toString(iterVertex->position.x) + "," + StringConverter::toString(iterVertex->position.y) + "," + StringConverter::toString(iterVertex->position.z));
indexData.push_back(iterVertex - vertexData.begin());
edgeIter = edgeIter->nextHalfEdge;
iterVertex = find(vertexData.begin(), vertexData.end(), *(edgeIter->target));
Vector3 v1 = (*(edgeIter->target)).position.toOgreVector3();
LogManager::getSingleton().logMessage(" " + StringConverter::toString(iterVertex->position.x) + "," + StringConverter::toString(iterVertex->position.y) + "," + StringConverter::toString(iterVertex->position.z));
indexData.push_back(iterVertex - vertexData.begin());
edgeIter = edgeIter->nextHalfEdge;
iterVertex = find(vertexData.begin(), vertexData.end(), *(edgeIter->target));
Vector3 v2 = (*(edgeIter->target)).position.toOgreVector3();
LogManager::getSingleton().logMessage(" " + StringConverter::toString(iterVertex->position.x) + "," + StringConverter::toString(iterVertex->position.y) + "," + StringConverter::toString(iterVertex->position.z));
indexData.push_back(iterVertex - vertexData.begin());
indexData.push_back(iterVertex - vertexData.begin());
Vector3 cross = (v0-v1).crossProduct(v2-v1);
LogManager::getSingleton().logMessage("Cross = " + StringConverter::toString(cross));
//LogManager::getSingleton().logMessage("End Triangle");
}
@ -332,8 +338,7 @@ namespace Ogre
bool edgeZMatch = (firstExtreme->position.z == vertexIter->position.z) && (secondExtreme->position.z == vertexIter->position.z);
twoEdgesMatch = ((edgeXMatch&&edgeYMatch) || (edgeXMatch&&edgeZMatch) || (edgeYMatch&&edgeZMatch));
}
}
return (allXMatch || allYMatch || allZMatch)
&& (twoEdgesMatch);
@ -427,6 +432,12 @@ namespace Ogre
{
continue;
}
if(isPolygonConvex(listConnectedVertices) == false)
{
return false;
}
LogManager::getSingleton().logMessage("Vertex can be removed");
for(std::list<SurfaceVertexIterator>::iterator iter = listConnectedVertices.begin(); iter != listConnectedVertices.end(); ++iter)
@ -458,9 +469,9 @@ namespace Ogre
LogManager::getSingleton().logMessage("Done decimation");
LogManager::getSingleton().logMessage("No of triangles at end = " + StringConverter::toString(m_listTriangles.size()));
std::vector<SurfaceVertex> vertexDataTemp;
/*std::vector<SurfaceVertex> vertexDataTemp;
std::vector<uint> indexDataTemp;
getVertexAndIndexData(vertexDataTemp, indexDataTemp);
getVertexAndIndexData(vertexDataTemp, indexDataTemp);*/
return didDecimation;
}
@ -485,4 +496,119 @@ namespace Ogre
++v2IterIter;
}
}
bool SurfacePatch::isPolygonConvex(std::list<SurfaceVertexIterator> listVertices)
{
std::list<SurfaceVertexIterator>::iterator v0IterIter = listVertices.begin();
std::list<SurfaceVertexIterator>::iterator v1IterIter = listVertices.begin();
std::list<SurfaceVertexIterator>::iterator v2IterIter = listVertices.begin();
++v1IterIter;
++v2IterIter;
++v2IterIter;
while(v2IterIter != listVertices.end())
{
SurfaceVertexIterator v0Iter = *v0IterIter;
SurfaceVertexIterator v1Iter = *v1IterIter;
SurfaceVertexIterator v2Iter = *v2IterIter;
Vector3 v1tov0(v0Iter->position.toOgreVector3() -v1Iter->position.toOgreVector3());
Vector3 v1tov2(v2Iter->position.toOgreVector3() -v1Iter->position.toOgreVector3());
Vector3 cross = (v1tov0).crossProduct(v1tov2);
LogManager::getSingleton().logMessage("Cross = " + StringConverter::toString(cross));
if(cross.z > 0.0)
{
return false;
}
++v1IterIter;
++v2IterIter;
}
return true;
}
/*bool SurfacePatch::isPolygonConvex(std::list<SurfaceVertexIterator> listVertices)
{
std::list<SurfaceVertexIterator>::iterator v0IterIter = listVertices.begin();
std::list<SurfaceVertexIterator>::iterator v1IterIter = listVertices.begin();
++v1IterIter;
while(v1IterIter != listVertices.end())
{
SurfaceVertexIterator v0Iter = *v0IterIter;
SurfaceVertexIterator v1Iter = *v1IterIter;
Vector3 currentEdge = v1Iter->position.toOgreVector3() - v0Iter->position.toOgreVector3();
for(std::list<SurfaceVertexIterator>::iterator currentVertex = listVertices.begin(); currentVertex != listVertices.end(); ++currentVertex)
{
if((currentVertex == v0IterIter) || (currentVertex == v1IterIter))
{
continue;
}
Vector3 v0ToCurrent = (*currentVertex)->position.toOgreVector3() - v0Iter->position.toOgreVector3();
if(currentEdge.)
}
++v0IterIter;
++v1IterIter;
}
return true;
}*/
/*bool SurfacePatch::isPolygonConvex(std::list<SurfaceVertexIterator> listVertices)
{
if(listVertices.size() < 3)
{
LogManager::getSingleton().logMessage("Not enough vertices!");
return false;
}
std::list<SurfaceVertexIterator>::iterator v0IterIter = listVertices.begin();
std::list<SurfaceVertexIterator>::iterator v1IterIter = listVertices.begin();
std::list<SurfaceVertexIterator>::iterator v2IterIter = listVertices.begin();
++v1IterIter;
++v2IterIter;
++v2IterIter;
SurfaceVertexIterator v0Iter = *v0IterIter;
SurfaceVertexIterator v1Iter = *v1IterIter;
SurfaceVertexIterator v2Iter = *v2IterIter;
Vector3 v0tov1 = v1Iter->position.toOgreVector3() - v0Iter->position.toOgreVector3();
Vector3 v1tov2 = v2Iter->position.toOgreVector3() - v1Iter->position.toOgreVector3();
Vector3 firstCrossProduct = v0tov1.crossProduct(v1tov2);
firstCrossProduct.normalise();
++v0IterIter;
++v1IterIter;
++v2IterIter;
while(v2IterIter != listVertices.end())
{
v0Iter = *v0IterIter;
v1Iter = *v1IterIter;
v2Iter = *v2IterIter;
v0tov1 = v1Iter->position.toOgreVector3() - v0Iter->position.toOgreVector3();
v1tov2 = v2Iter->position.toOgreVector3() - v1Iter->position.toOgreVector3();
Vector3 currentCrossProduct = v0tov1.crossProduct(v1tov2);
currentCrossProduct.normalise();
if(firstCrossProduct.dotProduct(currentCrossProduct) < 0.99)
{
return false;
}
++v0IterIter;
++v1IterIter;
++v2IterIter;
}
return true;
}*/
}