///////////////////////////////////////////////////////////////////////////////////////////
// Build()
//
// Builds a strip forward as far as we can go, then builds backwards, and joins the two lists
//
void NvStripInfo::Build(NvEdgeInfoVec &edgeInfos, NvFaceInfoVec &faceInfos)
{
	// used in building the strips forward and backward
	WordVec scratchIndices;
	
	// build forward... start with the initial face
	NvFaceInfoVec forwardFaces, backwardFaces;
	forwardFaces.push_back(m_startInfo.m_startFace);

	MarkTriangle(m_startInfo.m_startFace);
	
	int v0 = (m_startInfo.m_toV1 ? m_startInfo.m_startEdge->m_v0 : m_startInfo.m_startEdge->m_v1);
	int v1 = (m_startInfo.m_toV1 ? m_startInfo.m_startEdge->m_v1 : m_startInfo.m_startEdge->m_v0);
	
	// easiest way to get v2 is to use this function which requires the
	// other indices to already be in the list.
	scratchIndices.push_back(v0);
	scratchIndices.push_back(v1);
	int v2 = NvStripifier::GetNextIndex(scratchIndices, m_startInfo.m_startFace);
	scratchIndices.push_back(v2);

	//
	// build the forward list
	//
	int nv0 = v1;
	int nv1 = v2;

	NvFaceInfo *nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, m_startInfo.m_startFace);
	while (nextFace != NULL && !IsMarked(nextFace))
	{
		//check to see if this next face is going to cause us to die soon
		int testnv0 = nv1;
		int testnv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		
		NvFaceInfo* nextNextFace = NvStripifier::FindOtherFace(edgeInfos, testnv0, testnv1, nextFace);

		if( (nextNextFace == NULL) || (IsMarked(nextNextFace)) )
		{
			//uh, oh, we're following a dead end, try swapping
			NvFaceInfo* testNextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, testnv1, nextFace);

			if( ((testNextFace != NULL) && !IsMarked(testNextFace)) )
			{
				//we only swap if it buys us something
				
				//add a "fake" degenerate face
				NvFaceInfo* tempFace = new NvFaceInfo(nv0, nv1, nv0, true);
				
				forwardFaces.push_back(tempFace);
				MarkTriangle(tempFace);

				scratchIndices.push_back(nv0);
				testnv0 = nv0;

				++m_numDegenerates;
			}

		}

		// add this to the strip
		forwardFaces.push_back(nextFace);

		MarkTriangle(nextFace);
		
		// add the index
		//nv0 = nv1;
		//nv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		scratchIndices.push_back(testnv1);
		
		// and get the next face
		nv0 = testnv0;
		nv1 = testnv1;

		nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, nextFace);
	
	}
	
	// tempAllFaces is going to be forwardFaces + backwardFaces
	// it's used for Unique()
	NvFaceInfoVec tempAllFaces;
	for(size_t i = 0; i < forwardFaces.size(); i++)
		tempAllFaces.push_back(forwardFaces[i]);

	//
	// reset the indices for building the strip backwards and do so
	//
	scratchIndices.resize(0);
	scratchIndices.push_back(v2);
	scratchIndices.push_back(v1);
	scratchIndices.push_back(v0);
	nv0 = v1;
	nv1 = v0;
	nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, m_startInfo.m_startFace);
	while (nextFace != NULL && !IsMarked(nextFace))
	{
		//this tests to see if a face is "unique", meaning that its vertices aren't already in the list
		// so, strips which "wrap-around" are not allowed
		if(!Unique(tempAllFaces, nextFace))
			break;

		//check to see if this next face is going to cause us to die soon
		int testnv0 = nv1;
		int testnv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		
		NvFaceInfo* nextNextFace = NvStripifier::FindOtherFace(edgeInfos, testnv0, testnv1, nextFace);

		if( (nextNextFace == NULL) || (IsMarked(nextNextFace)) )
		{
			//uh, oh, we're following a dead end, try swapping
			NvFaceInfo* testNextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, testnv1, nextFace);
			if( ((testNextFace != NULL) && !IsMarked(testNextFace)) )
			{
				//we only swap if it buys us something
				
				//add a "fake" degenerate face
				NvFaceInfo* tempFace = new NvFaceInfo(nv0, nv1, nv0, true);

				backwardFaces.push_back(tempFace);
				MarkTriangle(tempFace);
				scratchIndices.push_back(nv0);
				testnv0 = nv0;

				++m_numDegenerates;
			}
				
		}

		// add this to the strip
		backwardFaces.push_back(nextFace);
		
		//this is just so Unique() will work
		tempAllFaces.push_back(nextFace);

		MarkTriangle(nextFace);
		
		// add the index
		//nv0 = nv1;
		//nv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		scratchIndices.push_back(testnv1);
		
		// and get the next face
		nv0 = testnv0;
		nv1 = testnv1;
		nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, nextFace);
	}
	
	// Combine the forward and backwards stripification lists and put into our own face vector
	Combine(forwardFaces, backwardFaces);
}
Example #2
0
///////////////////////////////////////////////////////////////////////////////////////////
// Build()
//
// Builds a strip forward as far as we can go, then builds backwards, and joins the two lists
//
void NvStripInfo::Build(NvEdgeInfoVec &edgeInfos, NvFaceInfoVec &faceInfos){
	
	// used in building the strips forward and backward
	static WordVec scratchIndices;
	scratchIndices.resize(0);
	
	// build forward... start with the initial face
	NvFaceInfoVec forwardFaces, backwardFaces;
	forwardFaces.push_back(m_startInfo.m_startFace);

	MarkTriangle(m_startInfo.m_startFace);
	
	int v0 = (m_startInfo.m_toV1 ? m_startInfo.m_startEdge->m_v0 : m_startInfo.m_startEdge->m_v1);
	int v1 = (m_startInfo.m_toV1 ? m_startInfo.m_startEdge->m_v1 : m_startInfo.m_startEdge->m_v0);
	
	// easiest way to get v2 is to use this function which requires the
	// other indices to already be in the list.
	scratchIndices.push_back(u16(v0));
	scratchIndices.push_back(u16(v1));
	int v2 = NvStripifier::GetNextIndex(scratchIndices, m_startInfo.m_startFace);
	scratchIndices.push_back(u16(v2));
	
	//
	// build the forward list
	//
	int nv0 = v1;
	int nv1 = v2;
	
	NvFaceInfo *nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, m_startInfo.m_startFace);
	while (nextFace != NULL && !IsMarked(nextFace))
	{
		//this tests to see if a face is "unique", meaning that its vertices aren't already in the list
		// so, strips which "wrap-around" are not allowed
		if(!Unique(forwardFaces, nextFace))
			break;

		// add this to the strip
		forwardFaces.push_back(nextFace);

		MarkTriangle(nextFace);
		
		// add the index
		nv0 = nv1;
		nv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		scratchIndices.push_back(u16(nv1));
		
		// and get the next face
		nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, nextFace);
		
	}
	
	// tempAllFaces is going to be forwardFaces + backwardFaces
	// it's used for Unique()
	NvFaceInfoVec tempAllFaces;
	for(int i = 0; i < forwardFaces.size(); i++)
		tempAllFaces.push_back(forwardFaces[i]);

	//
	// reset the indices for building the strip backwards and do so
	//
	scratchIndices.resize(0);
	scratchIndices.push_back(u16(v2));
	scratchIndices.push_back(u16(v1));
	scratchIndices.push_back(u16(v0));
	nv0 = v1;
	nv1 = v0;
	nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, m_startInfo.m_startFace);
	while (nextFace != NULL && !IsMarked(nextFace))
	{
		//this tests to see if a face is "unique", meaning that its vertices aren't already in the list
		// so, strips which "wrap-around" are not allowed
		if(!Unique(tempAllFaces, nextFace))
			break;

		// add this to the strip
		backwardFaces.push_back(nextFace);
		
		//this is just so Unique() will work
		tempAllFaces.push_back(nextFace);

		MarkTriangle(nextFace);
		
		// add the index
		nv0 = nv1;
		nv1 = NvStripifier::GetNextIndex(scratchIndices, nextFace);
		scratchIndices.push_back(u16(nv1));
		
		// and get the next face
		nextFace = NvStripifier::FindOtherFace(edgeInfos, nv0, nv1, nextFace);
	}
	
	// Combine the forward and backwards stripification lists and put into our own face vector3
	Combine(forwardFaces, backwardFaces);
}