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Work on mesh decimation.

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This commit is contained in:
David Williams 2007-09-09 23:28:09 +00:00
parent c2194378cd
commit 358192b38a
3 changed files with 262 additions and 204 deletions
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8
include/SurfacePatch.h
View File

@ -42,7 +42,15 @@ namespace Ogre
void computeOtherHalfEdges(void); void computeOtherHalfEdges(void);
#ifdef BLAH
bool decimate(void); bool decimate(void);
bool canCollapseEdge(SurfaceVertex target, SurfaceVertex other);
void collapseEdge(SurfaceEdgeIterator edgeIter);
#endif
bool decimate2(void);
bool canCollapseEdge2(SurfaceVertex target, SurfaceVertex other);
void collapseEdge2(SurfaceEdgeIterator edgeIter);
//bool verticesArePlanar(SurfaceVertexIterator iterCurrentVertex); //bool verticesArePlanar(SurfaceVertexIterator iterCurrentVertex);

10
source/PolyVoxSceneManager.cpp
View File

@ -1010,11 +1010,11 @@ namespace Ogre
iterPatch->second.computeNormalsFromVolume(volIter); iterPatch->second.computeNormalsFromVolume(volIter);
iterPatch->second.endDefinition(); iterPatch->second.endDefinition();
bool removedVertex = false; bool removedVertex = false;
do //do
{ //{
removedVertex = iterPatch->second.decimate(); removedVertex = iterPatch->second.decimate2();
} //}
while(removedVertex); //while(removedVertex);
} }
//LogManager::getSingleton().logMessage("Finished Generating Mesh Data"); //LogManager::getSingleton().logMessage("Finished Generating Mesh Data");

448
source/SurfacePatch.cpp
View File

@ -334,11 +334,174 @@ namespace Ogre
} }
}*/ }*/
#ifdef BLAH
bool SurfacePatch::decimate(void) bool SurfacePatch::decimate(void)
{ {
bool removedEdge = false; bool removedEdge = false;
//LogManager::getSingleton().logMessage("Performing decimation"); LogManager::getSingleton().logMessage("Performing decimation");
//LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size())); LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size()));
for(SurfaceEdgeIterator edgeIter = m_listEdges.begin(); edgeIter != m_listEdges.end(); ++edgeIter)
{
LogManager::getSingleton().logMessage("Examining Edge " + edgeIter->toString());
SurfaceVertexIterator targetVertexIter = edgeIter->target;
SurfaceVertexIterator otherVertexIter = edgeIter->nextHalfEdge->nextHalfEdge->target;
LogManager::getSingleton().logMessage("Target Vertex = " + targetVertexIter->toString());
LogManager::getSingleton().logMessage("Other Vertex = " + otherVertexIter->toString());
//if((targetVertexIter->flags == 0) /*&& (otherVertexIter->flags == 0)*/)
if(canCollapseEdge(*targetVertexIter,*otherVertexIter))
{
collapseEdge(edgeIter);
removedEdge = true;
break;
}
else
{
LogManager::getSingleton().logMessage(" Not Collapsing Edge");
//LogManager::getSingleton().logMessage("Edge Target Vertex = " + StringConverter::toString(edgeIter->target->position.toOgreVector3()));
//LogManager::getSingleton().logMessage("Other Edge Non-Existant");
}
}
LogManager::getSingleton().logMessage("Done decimation");
LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size()));
return removedEdge;
}
bool SurfacePatch::canCollapseEdge(SurfaceVertex target, SurfaceVertex other)
{
if((target.flags == 0) /*&& (other.flags == 0)*/)
{
if((other.flags == 0))
{
LogManager::getSingleton().logMessage("Both Zero");
return true;
}
else
{
LogManager::getSingleton().logMessage("Target Zero");
return false;
}
//return true;
}
else
return false;
}
void SurfacePatch::collapseEdge(SurfaceEdgeIterator edgeIter)
{
SurfaceVertexIterator targetVertexIter = edgeIter->target;
SurfaceVertexIterator otherVertexIter = edgeIter->nextHalfEdge->nextHalfEdge->target;
LogManager::getSingleton().logMessage(" Collapsing Edge");
for(SurfaceEdgeIterator innerEdgeIter = m_listEdges.begin(); innerEdgeIter != m_listEdges.end(); ++innerEdgeIter)
{
if((innerEdgeIter->target == targetVertexIter) && (innerEdgeIter != edgeIter))
{
LogManager::getSingleton().logMessage(" Reset Edge Target");
innerEdgeIter->target = otherVertexIter;
}
}
if(edgeIter->hasOtherHalfEdge)
{
LogManager::getSingleton().logMessage(" Has Other Edge");
SurfaceEdgeIterator otherEdgeIter = edgeIter->otherHalfEdge;
/*SurfaceTriangleIterator otherTriangleIter = otherEdgeIter->triangle;
m_listTriangles.erase(otherTriangleIter);*/
LogManager::getSingleton().logMessage(" Removing Other Edges");
SurfaceTriangleIterator otherTriangleIter = otherEdgeIter->triangle;
SurfaceEdgeIterator currentIter = otherTriangleIter->edge;
for(uint ct = 0; ct < 3; ++ct)
{
SurfaceEdgeIterator previousIter = currentIter;
currentIter = currentIter->nextHalfEdge;
if(previousIter->hasOtherHalfEdge)
{
previousIter->otherHalfEdge->hasOtherHalfEdge = false;
}
for(SurfaceVertexIterator vertexIter = m_listVertices.begin(); vertexIter != m_listVertices.end(); ++vertexIter)
{
if(vertexIter->edge == previousIter)
{
LogManager::getSingleton().logMessage("Error! Vertex points to dead edge!");
for(SurfaceEdgeIterator potentialNewEdge = m_listEdges.begin(); potentialNewEdge != m_listEdges.end(); ++potentialNewEdge)
{
if(potentialNewEdge->hasOtherHalfEdge)
{
if(potentialNewEdge->otherHalfEdge->target == vertexIter)
{
vertexIter->edge = potentialNewEdge;
LogManager::getSingleton().logMessage(" Fixed");
break;
}
}
}
}
}
m_listEdges.erase(previousIter);
}
LogManager::getSingleton().logMessage(" Removing Other Triangle");
m_listTriangles.erase(otherTriangleIter);
}
else
{
LogManager::getSingleton().logMessage(" Does Not Have Other Edge");
}
LogManager::getSingleton().logMessage(" Removing Edges");
SurfaceTriangleIterator triangleIter = edgeIter->triangle;
SurfaceEdgeIterator currentIter = triangleIter->edge;
for(uint ct = 0; ct < 3; ++ct)
{
SurfaceEdgeIterator previousIter = currentIter;
currentIter = currentIter->nextHalfEdge;
if(previousIter->hasOtherHalfEdge)
{
previousIter->otherHalfEdge->hasOtherHalfEdge = false;
}
for(SurfaceVertexIterator vertexIter = m_listVertices.begin(); vertexIter != m_listVertices.end(); ++vertexIter)
{
if(vertexIter->edge == previousIter)
{
LogManager::getSingleton().logMessage("Error! Vertex points to dead edge!");
for(SurfaceEdgeIterator potentialNewEdge = m_listEdges.begin(); potentialNewEdge != m_listEdges.end(); ++potentialNewEdge)
{
if(potentialNewEdge->hasOtherHalfEdge)
{
if(potentialNewEdge->otherHalfEdge->target == vertexIter)
{
vertexIter->edge = potentialNewEdge;
LogManager::getSingleton().logMessage(" Fixed");
break;
}
}
}
}
}
m_listEdges.erase(previousIter);
}
LogManager::getSingleton().logMessage(" Removing Triangle");
m_listTriangles.erase(triangleIter);
LogManager::getSingleton().logMessage(" Removing Vertex");
m_listVertices.erase(targetVertexIter);
}
#endif
bool SurfacePatch::decimate2(void)
{
LogManager::getSingleton().logMessage("Performing decimation");
LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size()));
for(SurfaceEdgeIterator edgeIter = m_listEdges.begin(); edgeIter != m_listEdges.end(); ++edgeIter) for(SurfaceEdgeIterator edgeIter = m_listEdges.begin(); edgeIter != m_listEdges.end(); ++edgeIter)
{ {
@ -350,68 +513,18 @@ namespace Ogre
//LogManager::getSingleton().logMessage("Target Vertex = " + targetVertexIter->toString()); //LogManager::getSingleton().logMessage("Target Vertex = " + targetVertexIter->toString());
//LogManager::getSingleton().logMessage("Other Vertex = " + otherVertexIter->toString()); //LogManager::getSingleton().logMessage("Other Vertex = " + otherVertexIter->toString());
if((targetVertexIter->flags == 0) /*&& (otherVertexIter->flags == 0)*/) if(canCollapseEdge2(*targetVertexIter,*otherVertexIter))
{ {
//LogManager::getSingleton().logMessage(" Collapsing Edge"); //LogManager::getSingleton().logMessage(" Collapsing Edge");
for(SurfaceEdgeIterator innerEdgeIter = m_listEdges.begin(); innerEdgeIter != m_listEdges.end(); ++innerEdgeIter) //collapseEdge2(edgeIter);
for(SurfaceVertexIterator vertexIter = m_listVertices.begin(); vertexIter != m_listVertices.end(); ++vertexIter)
{ {
if(innerEdgeIter->target == targetVertexIter) if(vertexIter->position == targetVertexIter->position)
{ {
//LogManager::getSingleton().logMessage(" Reset Edge Target"); vertexIter->position = otherVertexIter->position;
innerEdgeIter->target = otherVertexIter; vertexIter->flags = otherVertexIter->flags;
} }
} }
if(edgeIter->hasOtherHalfEdge)
{
//LogManager::getSingleton().logMessage(" Has Other Edge");
SurfaceEdgeIterator otherEdgeIter = edgeIter->otherHalfEdge;
//LogManager::getSingleton().logMessage(" Removing Other Edges");
SurfaceTriangleIterator otherTriangleIter = otherEdgeIter->triangle;
SurfaceEdgeIterator currentIter = otherTriangleIter->edge;
for(uint ct = 0; ct < 3; ++ct)
{
SurfaceEdgeIterator previousIter = currentIter;
currentIter = currentIter->nextHalfEdge;
if(previousIter->hasOtherHalfEdge)
{
previousIter->otherHalfEdge->hasOtherHalfEdge = false;
}
m_listEdges.erase(previousIter);
}
//LogManager::getSingleton().logMessage(" Removing Other Triangle");
m_listTriangles.erase(otherTriangleIter);
}
else
{
//LogManager::getSingleton().logMessage(" Does Not Have Other Edge");
}
//LogManager::getSingleton().logMessage(" Removing Edges");
SurfaceTriangleIterator triangleIter = edgeIter->triangle;
SurfaceEdgeIterator currentIter = triangleIter->edge;
for(uint ct = 0; ct < 3; ++ct)
{
SurfaceEdgeIterator previousIter = currentIter;
currentIter = currentIter->nextHalfEdge;
if(previousIter->hasOtherHalfEdge)
{
previousIter->otherHalfEdge->hasOtherHalfEdge = false;
}
m_listEdges.erase(previousIter);
}
//LogManager::getSingleton().logMessage(" Removing Triangle");
m_listTriangles.erase(triangleIter);
//LogManager::getSingleton().logMessage(" Removing Vertex");
m_listVertices.erase(targetVertexIter);
removedEdge = true;
break;
} }
else else
{ {
@ -420,158 +533,95 @@ namespace Ogre
//LogManager::getSingleton().logMessage("Other Edge Non-Existant"); //LogManager::getSingleton().logMessage("Other Edge Non-Existant");
} }
} }
//LogManager::getSingleton().logMessage("Done decimation"); LogManager::getSingleton().logMessage("Done decimation");
//LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size())); LogManager::getSingleton().logMessage("No of triangles = " + StringConverter::toString(m_listTriangles.size()));
return removedEdge; return true;
} }
#ifdef BLAH bool SurfacePatch::canCollapseEdge2(SurfaceVertex target, SurfaceVertex other)
void SurfacePatch::decimate(void)
{ {
LogManager::getSingleton().logMessage("Vertices before decimation = " + StringConverter::toString(m_setVertices.size())); if(target.position == other.position)
LogManager::getSingleton().logMessage("Triangles before decimation = " + StringConverter::toString(m_setTriangles.size())); return false;
/*if(target.flags == other.flags)
return true;*/
//Build the lists of connected vertices /*if(target.position == UIntVector3(0,0,15))
/*for(SurfaceVertexIterator vertexIter = m_setVertices.begin(); vertexIter != m_setVertices.end(); ++vertexIter) return false;
if(target.position == UIntVector3(0,16,15))
return false;
if(target.position == UIntVector3(16,0,15))
return false;
if(target.position == UIntVector3(16,16,15))
return false;*/
/*if(target.position.x < 3)
return false;
if(target.position.y < 3)
return false;
if(target.position.x > 13)
return false;
if(target.position.y > 13)
return false;*/
if(target.flags & 0x01)
{ {
vertexIter->listConnectedVertices.clear(); if(other.flags & 0x01)
for(std::list<SurfaceTriangleIterator>::iterator triangleIter = vertexIter->listTrianglesUsingThisVertex.begin(); triangleIter != vertexIter->listTrianglesUsingThisVertex.end(); ++triangleIter)
{ {
SurfaceVertexIterator connectedVertex;
connectedVertex = (*triangleIter)->v0;
if(find(vertexIter->listConnectedVertices.begin(),vertexIter->listConnectedVertices.end(),connectedVertex) == vertexIter->listConnectedVertices.end())
vertexIter->listConnectedVertices.push_back(connectedVertex);
connectedVertex = (*triangleIter)->v1;
if(find(vertexIter->listConnectedVertices.begin(),vertexIter->listConnectedVertices.end(),connectedVertex) == vertexIter->listConnectedVertices.end())
vertexIter->listConnectedVertices.push_back(connectedVertex);
connectedVertex = (*triangleIter)->v2;
if(find(vertexIter->listConnectedVertices.begin(),vertexIter->listConnectedVertices.end(),connectedVertex) == vertexIter->listConnectedVertices.end())
vertexIter->listConnectedVertices.push_back(connectedVertex);
} }
else
//Remove self from own connected vertex list
vertexIter->listConnectedVertices.remove(vertexIter);
}*/
//do the vertex merging
//for(SurfaceVertexIterator vertexIter = m_setVertices.begin(); vertexIter != m_setVertices.end(); ++vertexIter)
for(uint ct = 0; ct < 500; ++ct)
{
SurfaceVertexIterator currentVertexIter;
for(currentVertexIter = m_setVertices.begin(); currentVertexIter != m_setVertices.end(); ++currentVertexIter)
{ {
return false;
//LogManager::getSingleton().logMessage("Vertex Pos = " + StringConverter::toString(vertexIter->position.x) + "," + StringConverter::toString(vertexIter->position.y) + "," + StringConverter::toString(vertexIter->position.z) + " No of connected vertices = " + StringConverter::toString(vertexIter->listConnectedVertices.size()));
/*if(vertexIter->listConnectedVertices.size() == 6)
break;*/
if(currentVertexIter->flags == 0)
break;
if(currentVertexIter->flags == 0x01)
break;
if(currentVertexIter->flags == 0x02)
break;
if(currentVertexIter->flags == 0x04)
break;
if(currentVertexIter->flags == 0x08)
break;
}
if(currentVertexIter == m_setVertices.end())
break;
SurfaceVertex& currentVertex = *currentVertexIter;
//Find a vertex to merge with
/*std::list<SurfaceVertexIterator>::iterator firstConnectedVertexIter = currentVertex.listConnectedVertices.begin();
SurfaceVertex& vertexToMergeWith = (*(*firstConnectedVertexIter));
SurfaceVertexIterator vertexToMergeWithIter = m_setVertices.find(vertexToMergeWith);*/
SurfaceVertexIterator vertexToMergeWithIter = (*(currentVertex.listTrianglesUsingThisVertex.begin()))->v0;
SurfaceVertex vertexToMergeWith = *vertexToMergeWithIter;
if(currentVertex == vertexToMergeWith)
{
vertexToMergeWithIter = (*(currentVertex.listTrianglesUsingThisVertex.begin()))->v1;
vertexToMergeWith = *vertexToMergeWithIter;
}
for(std::list<SurfaceTriangleIterator>::iterator triangleIterIter = currentVertex.listTrianglesUsingThisVertex.begin(); triangleIterIter != currentVertex.listTrianglesUsingThisVertex.end(); ++triangleIterIter)
{
SurfaceVertex connectedVertex = (*(*triangleIterIter)->v0);
}
//Change triangles to use new vertex
for(SurfaceTriangleIterator iterTriangles = m_setTriangles.begin(); iterTriangles != m_setTriangles.end(); ++iterTriangles)
{
if(*(iterTriangles->v0) == currentVertex)
iterTriangles->v0 = vertexToMergeWithIter;
if(*(iterTriangles->v1) == currentVertex)
iterTriangles->v1 = vertexToMergeWithIter;
if(*(iterTriangles->v2) == currentVertex)
iterTriangles->v2 = vertexToMergeWithIter;
}
//Remove the vertex from other connected vertex lists
/*for(std::list<SurfaceVertexIterator>::iterator connectedVertexIter = currentVertex.listConnectedVertices.begin(); connectedVertexIter != currentVertex.listConnectedVertices.end(); ++connectedVertexIter)
{
for(std::list<SurfaceVertexIterator>::iterator secondLevelConnectedIter = (*connectedVertexIter)->listConnectedVertices.begin(); secondLevelConnectedIter != (*connectedVertexIter)->listConnectedVertices.end(); ++secondLevelConnectedIter)
{
if((*(*secondLevelConnectedIter)) == currentVertex)
{
(*connectedVertexIter)->listConnectedVertices.remove(secondLevelConnected);
break;
}
}
}*/
//Now remove the vertex as nothing should point to it.
m_setVertices.erase(currentVertexIter);
}
}
/*bool SurfacePatch::verticesArePlanar(SurfaceVertexIterator iterCurrentVertex)
{
//FIXME - specially handle the case where they are all the same.
//This is happening a lot after many vertices have been moved round?
bool allXMatch = true;
bool allYMatch = true;
bool allZMatch = true;
bool allNormalsMatch = true;
//FIXME - reorder come of these tests based on likelyness to fail?
//std::set<uint>::iterator iterConnectedVertices;
std::list<SurfaceVertexIterator> listConnectedVertices = iterCurrentVertex->listConnectedVertices;
std::list<SurfaceVertexIterator>::iterator iterConnectedVertices;
for(iterConnectedVertices = listConnectedVertices.begin(); iterConnectedVertices != listConnectedVertices.end(); ++iterConnectedVertices)
{
if(iterCurrentVertex->position.x != (*iterConnectedVertices)->position.x)
{
allXMatch = false;
}
if(iterCurrentVertex->position.y != (*iterConnectedVertices)->position.y)
{
allYMatch = false;
}
if(iterCurrentVertex->position.z != (*iterConnectedVertices)->position.z)
{
allZMatch = false;
}
//FIXME - are these already normalised? We should make sure they are...
if(iterCurrentVertex->normal.normalisedCopy().dotProduct((*iterConnectedVertices)->normal.normalisedCopy()) < 0.99)
{
return false;
} }
} }
return allXMatch || allYMatch || allZMatch; if(target.flags & 0x02)
}*/ {
#endif if(other.flags & 0x02)
{
}
else
{
return false;
}
}
if(target.flags & 0x04)
{
if(other.flags & 0x04)
{
}
else
{
return false;
}
}
if(target.flags & 0x08)
{
if(other.flags & 0x08)
{
}
else
{
return false;
}
}
return true;
}
void SurfacePatch::collapseEdge2(SurfaceEdgeIterator edgeIter)
{
SurfaceVertexIterator targetVertexIter = edgeIter->target;
SurfaceVertexIterator otherVertexIter = edgeIter->nextHalfEdge->nextHalfEdge->target;
for(SurfaceVertexIterator vertexIter = m_listVertices.begin(); vertexIter != m_listVertices.end(); ++vertexIter)
{
if(vertexIter->position == targetVertexIter->position)
{
vertexIter->position = otherVertexIter->position;
}
}
}
} }