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140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "std3d.h"
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#include "nel/3d/mrm_internal.h"
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#include "nel/misc/common.h"
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using namespace std;
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using namespace NLMISC;
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namespace NL3D
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{
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// ***************************************************************************
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sint CMRMSewingMesh::mustCollapseEdge(uint lod, const CMRMEdge &edge, uint &vertToCollapse) const
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{
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nlassert(lod<_Lods.size());
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for(uint i=0;i<_Lods[lod].EdgeToCollapse.size();i++)
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{
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if(edge==_Lods[lod].EdgeToCollapse[i])
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{
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// the vertex which must be collapsed is v0.
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vertToCollapse= _Lods[lod].EdgeToCollapse[i].v0;
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return i;
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}
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}
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// not found
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return -1;
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}
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// ***************************************************************************
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sint CMRMSewingMesh::getNumCollapseEdge(uint lod) const
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{
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nlassert(lod<_Lods.size());
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return (sint)_Lods[lod].EdgeToCollapse.size();
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}
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// ***************************************************************************
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void CMRMSewingMesh::build(const CMesh::CInterface &meshInt, uint nWantedLods, uint divisor)
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{
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/* The polygon is MRM-egde-like reduced (pop an edge when needed)
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At each lod we store what edge is collapsed.
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*/
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_Lods.clear();
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_Lods.resize(nWantedLods);
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// build edge list
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std::vector<CMRMEdge> edgeList;
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uint nMaxEdges= (uint)meshInt.Vertices.size();
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edgeList.resize(nMaxEdges);
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for(uint i=0;i<nMaxEdges;i++)
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{
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edgeList[i].v0= i;
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edgeList[i].v1= (i+1)%nMaxEdges;
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}
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// build how many edges the coarsest lod will have. At least 3 edge for a correct cross section
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sint nBaseEdges= nMaxEdges/divisor;
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nBaseEdges=max(nBaseEdges,3);
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// must fill all LODs, from end to start. do not proces last lod since it will be the coarsest mesh (no collapse)
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for(uint lod=nWantedLods-1;lod>0;lod--)
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{
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// Linear.
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sint nCurEdges= (sint)floor( 0.5f + nBaseEdges + (nMaxEdges-nBaseEdges) * (float)(lod-1)/(nWantedLods-1) );
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nCurEdges=max(nCurEdges,3);
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// the current edge list is reduced until same size as wanted
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while(nCurEdges<(sint)edgeList.size())
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{
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// search the smallest edge
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float bestDist= FLT_MAX;
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uint bestEdgeId= 0;
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for(uint j=0;j<edgeList.size();j++)
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{
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uint precEdgeId= (uint)((j + edgeList.size() -1) % edgeList.size());
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CVector edgeDelta= (meshInt.Vertices[edgeList[j].v1].Pos - meshInt.Vertices[edgeList[j].v0].Pos);
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// compute dist between 2 verts
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float dist= edgeDelta.norm();
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// compute dir of prec and cur edges
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CVector curEdgeDir= edgeDelta;
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CVector precEdgeDir= (meshInt.Vertices[edgeList[precEdgeId].v1].Pos - meshInt.Vertices[edgeList[precEdgeId].v0].Pos);
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curEdgeDir.normalize();
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precEdgeDir.normalize();
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// compute how linear they are from -1 to 1.
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float angularPart= curEdgeDir * precEdgeDir;
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/* The more the edge is linear to the previous edge, the more we can collapse it.
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If totaly linear (curEdgeDir*precEdgeDir==1), it should be a good idea to collapse it now.
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But the fact is that this is an interface and we don't know what kind of mesh share those edges
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(I mean it is possible that neighbors faces are absolutely not coplanar).
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So don't add to much importance on Angular Part
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*/
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const float angularBias= 1; // if 0, 2 linear edges will collapse asap.
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dist*= angularBias + 1-angularPart;
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// take min dist
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if(dist<bestDist)
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{
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bestDist= dist;
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bestEdgeId= j;
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}
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}
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// mark as remove it
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_Lods[lod].EdgeToCollapse.push_back(edgeList[bestEdgeId]);
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// changes vert ids of the prec edge. eg: edge(12) is deleted=> 01 12 23... becomes 02 23 (NB: 1 is collapsed to 2)
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uint precEdgeId= (uint)((bestEdgeId+edgeList.size()-1)%edgeList.size());
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edgeList[precEdgeId].v1= edgeList[bestEdgeId].v1;
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// and erase the edge from the current list
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edgeList.erase( edgeList.begin()+bestEdgeId );
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}
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}
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}
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} // NL3D
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