From Chris Denham, "ReaderWriter3DS smoothing group handling corrections"
This commit is contained in:
Robert Osfield
parent
aea4d1a261
commit
f56ab3a04e
@ -10,6 +10,7 @@
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#include <osg/MatrixTransform>
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#include <osg/BlendFunc>
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#include <osg/TexEnvCombine>
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#include <osg/CullFace>
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#include <osgDB/Registry>
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#include <osgDB/FileUtils>
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@ -206,11 +207,10 @@ protected:
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osg::Texture2D* createTexture(Lib3dsTextureMap *texture,const char* label,bool& transparancy);
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StateSetInfo createStateSet(Lib3dsMaterial *materials);
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osg::Drawable* createDrawable(Lib3dsMesh *meshes,FaceList& faceList, const osg::Matrix * matrix, StateSetInfo & ssi);
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osg::Drawable* createDrawable(Lib3dsMesh *meshes,FaceList& faceList, const osg::Matrix * matrix, StateSetInfo & ssi, bool smoothVertexNormals);
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std::string _directory;
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bool _useSmoothingGroups;
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bool _usePerVertexNormals;
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// MIKEC
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osg::Node* processMesh(StateSetMap& drawStateMap,osg::Group* parent,Lib3dsMesh* mesh, const osg::Matrix * matrix);
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@ -265,7 +265,6 @@ ReaderWriter3DS::ReaderWriter3DS()
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ReaderWriter3DS::ReaderObject::ReaderObject(const osgDB::ReaderWriter::Options* options) :
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_useSmoothingGroups(true),
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_usePerVertexNormals(true),
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options(options),
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noMatrixTransforms(false),
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checkForEspilonIdentityMatrices(false),
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@ -388,6 +387,11 @@ void ReaderWriter3DS::ReaderObject::addDrawableFromFace(osg::Geode * geode, Face
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flitr!=faceList.end();
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++flitr)
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{
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// ChrisD: Worth bearing in mind that this splitting up of
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// faces into smoothing groups is only correct for faces
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// belonging to a single smoothing group. The smoothing group
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// value is actually a bitmask for all the smoothing groups that
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// a face may belong to.
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smoothingFaceMap[mesh->faces[*flitr].smoothing_group].push_back(*flitr);
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}
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@ -395,11 +399,15 @@ void ReaderWriter3DS::ReaderObject::addDrawableFromFace(osg::Geode * geode, Face
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sitr!=smoothingFaceMap.end();
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++sitr)
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{
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// We only compute smoothed vertex normals for faces with non-zero smoothing group value.
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const unsigned int smoothing_group = sitr->first;
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bool smoothVertexNormals = (smoothing_group != 0);
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// each smoothing group to have its own geom
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// to ensure the vertices on adjacent groups
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// don't get shared.
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FaceList& smoothFaceMap = sitr->second;
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osg::ref_ptr<osg::Drawable> drawable = createDrawable(mesh,smoothFaceMap,matrix,ssi);
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FaceList& smoothFaceList = sitr->second;
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osg::ref_ptr<osg::Drawable> drawable = createDrawable(mesh, smoothFaceList, matrix, ssi, smoothVertexNormals);
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if (drawable.valid())
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{
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if (ssi.stateset)
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@ -410,7 +418,9 @@ void ReaderWriter3DS::ReaderObject::addDrawableFromFace(osg::Geode * geode, Face
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}
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else // ignore smoothing groups.
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{
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osg::ref_ptr<osg::Drawable> drawable = createDrawable(mesh,faceList,matrix,ssi);
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// Create drawable with no smoothing of normals.
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bool smoothVertexNormals = false;
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osg::ref_ptr<osg::Drawable> drawable = createDrawable(mesh, faceList, matrix, ssi, smoothVertexNormals);
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if (drawable.valid())
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{
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if (ssi.stateset)
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@ -830,168 +840,249 @@ osgDB::ReaderWriter::ReadResult ReaderWriter3DS::constructFrom3dsFile(Lib3dsFile
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return group;
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}
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/**
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use matrix to pretransform geometry, or NULL to do nothing
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*/
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osg::Drawable* ReaderWriter3DS::ReaderObject::createDrawable(Lib3dsMesh *m,FaceList& faceList, const osg::Matrix * matrix, StateSetInfo & ssi)
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struct RemappedFace
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{
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osg::Geometry * geom = new osg::Geometry;
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unsigned int i;
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Lib3dsFace* face; // Original face definition.
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osg::Vec3f normal;
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unsigned short index[3]; // Indices to OSG vertex/normal/texcoord arrays.
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};
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std::vector<int> orig2NewMapping;
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orig2NewMapping.reserve(m->nvertices);
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for(i=0;i<m->nvertices;++i) orig2NewMapping.push_back(-1);
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struct VertexParams
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{
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VertexParams() : matrix(NULL), smoothNormals(false), scaleUV(1.f, 1.f), offsetUV(0.f, 0.f) { }
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const osg::Matrix* matrix;
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bool smoothNormals;
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osg::Vec2f scaleUV;
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osg::Vec2f offsetUV;
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};
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unsigned int noVertex=0;
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FaceList::iterator fitr;
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for (fitr=faceList.begin();
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fitr!=faceList.end();
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++fitr)
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static bool isFaceValid(const Lib3dsMesh* mesh, const Lib3dsFace* face)
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{
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return
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face->index[0] < mesh->nvertices &&
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face->index[1] < mesh->nvertices &&
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face->index[2] < mesh->nvertices;
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}
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/* ChrisD: addVertex handles the averaging of normals and spltting of vertices
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required to implement normals for smoothing groups. When a shared
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vertex is encountered when smoothing is required, normals are added
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and normalized. When a shared vertex is encountered when smoothing is
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not required, we must split the vertex if a different normal is required.
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For example if we are processing a cube mesh with no smoothing group
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made from 12 triangles and 8 vertices, the resultant mesh should have
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24 vertices to accomodate the 3 different normals at each vertex.
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*/
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static void addVertex(
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const Lib3dsMesh* mesh,
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RemappedFace& remappedFace,
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unsigned short int i,
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osg::Geometry* geometry,
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std::vector<int>& origToNewMapping,
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std::vector<int>& splitVertexChain,
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const VertexParams& params)
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{
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osg::Vec3Array* vertices = (osg::Vec3Array*)geometry->getVertexArray();
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osg::Vec3Array* normals = (osg::Vec3Array*)geometry->getNormalArray();
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osg::Vec2Array* texCoords = (osg::Vec2Array*)geometry->getTexCoordArray(0);
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unsigned short int index = remappedFace.face->index[i];
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if (origToNewMapping[index] == -1)
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{
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Lib3dsFace& face = m->faces[*fitr];
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int newIndex = vertices->size();
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remappedFace.index[i] = newIndex;
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origToNewMapping[index] = newIndex;
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if (face.index[0]>=orig2NewMapping.size() ||
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face.index[1]>=orig2NewMapping.size() ||
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face.index[2]>=orig2NewMapping.size()) continue; // Avoids crash with corrupted files
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// Add the vertex position
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osg::Vec3 vertex = copyLib3dsVec3ToOsgVec3(mesh->vertices[index]);
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if (params.matrix) vertex = vertex * (*params.matrix);
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vertices->push_back(vertex);
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if (orig2NewMapping[face.index[0]]<0)
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orig2NewMapping[face.index[0]] = noVertex++;
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// Add the vertex normal
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normals->push_back(remappedFace.normal);
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if (orig2NewMapping[face.index[1]]<0)
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orig2NewMapping[face.index[1]] = noVertex++;
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if (orig2NewMapping[face.index[2]]<0)
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orig2NewMapping[face.index[2]] = noVertex++;
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}
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// create vertices.
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osg::ref_ptr<osg::Vec3Array> osg_coords = new osg::Vec3Array(noVertex);
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geom->setVertexArray(osg_coords.get());
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for (i=0; i<m->nvertices; ++i)
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{
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if (orig2NewMapping[i]>=0)
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// Add the texture coordinate.
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if (texCoords)
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{
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if (matrix)
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{
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(*osg_coords)[orig2NewMapping[i]].set( copyLib3dsVec3ToOsgVec3(m->vertices[i]) * (*matrix) );
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}
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else
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{
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// original no transform code.
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(*osg_coords)[orig2NewMapping[i]].set( copyLib3dsVec3ToOsgVec3(m->vertices[i]) );
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}
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}
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}
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// create texture coords if needed.
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if (m->texcos)
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{
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osg::ref_ptr<osg::Vec2Array> osg_tcoords = new osg::Vec2Array(noVertex);
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geom->setTexCoordArray(0, osg_tcoords.get());
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// Texture 0 parameters (only one texture supported for now)
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float scaleU(1.f), scaleV(1.f);
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float offsetU(0.f), offsetV(0.f);
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if (ssi.lib3dsmat && *(ssi.lib3dsmat->texture1_map.name)) // valid texture = name not empty
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{
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Lib3dsTextureMap & tex3ds = ssi.lib3dsmat->texture1_map;
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scaleU = tex3ds.scale[0];
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scaleV = tex3ds.scale[1];
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offsetU = tex3ds.offset[0];
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offsetV = tex3ds.offset[1];
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if (tex3ds.rotation != 0) OSG_NOTICE << "3DS texture rotation not supported yet" << std::endl;
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//TODO: tint_1, tint_2, tint_r, tint_g, tint_b
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osg::Vec2f texCoord(mesh->texcos[index][0], mesh->texcos[index][1]);
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texCoord = componentMultiply(texCoord, params.scaleUV);
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texCoord += params.offsetUV;
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texCoords->push_back(texCoord);
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}
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for (i=0; i<m->nvertices; ++i)
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{
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if (orig2NewMapping[i]>=0) (*osg_tcoords)[orig2NewMapping[i]].set(m->texcos[i][0]*scaleU + offsetU, m->texcos[i][1]*scaleV + offsetV);
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}
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}
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// create normals
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// Sukender: 3DS file format doesn't store normals (that is to say they're recomputed each time).
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// When using per vertex normals, we could use either vertex computation, or face computation (and copy the normal to each vertex). Here we use the latter one.
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if (_usePerVertexNormals)
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{
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//Lib3dsVector * normals = new Lib3dsVector[m->nfaces*3];
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//lib3ds_mesh_calculate_vertex_normals(m, normals);
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scoped_array<Lib3dsVector> normals( new Lib3dsVector[m->nfaces] ); // Temporary array
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lib3ds_mesh_calculate_face_normals(m, normals.get());
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osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array(noVertex);
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// initialize normal list to zero's.
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for (i=0; i<noVertex; ++i)
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{
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(*osg_normals)[i].set(0.0f,0.0f,0.0f);
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}
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for (fitr=faceList.begin();
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fitr!=faceList.end();
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++fitr)
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{
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Lib3dsFace& face = m->faces[*fitr];
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if (face.index[0]>=orig2NewMapping.size() ||
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face.index[1]>=orig2NewMapping.size() ||
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face.index[2]>=orig2NewMapping.size()) continue; // Avoids crash with corrupted files
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osg::Vec3f osgNormal( copyLib3dsVec3ToOsgVec3(normals[*fitr]) );
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if (matrix) osgNormal = osg::Matrix::transform3x3(osgNormal, *matrix);
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osgNormal.normalize();
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(*osg_normals)[orig2NewMapping[face.index[0]]] = osgNormal;
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(*osg_normals)[orig2NewMapping[face.index[1]]] = osgNormal;
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(*osg_normals)[orig2NewMapping[face.index[2]]] = osgNormal;
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}
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geom->setNormalArray(osg_normals.get());
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geom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
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// New vertex, so not split yet.
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splitVertexChain.push_back(-1);
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}
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else
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{
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scoped_array<Lib3dsVector> normals ( new Lib3dsVector[m->nfaces] );
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lib3ds_mesh_calculate_face_normals(m, normals.get());
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osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array(faceList.size());
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osg::Vec3Array::iterator normal_itr = osg_normals->begin();
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for (fitr=faceList.begin();
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fitr!=faceList.end();
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++fitr)
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int newIndex = origToNewMapping[index];
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if (params.smoothNormals)
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{
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osg::Vec3f osgNormal( copyLib3dsVec3ToOsgVec3(normals[*fitr]) );
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if (matrix) osgNormal = osg::Matrix::transform3x3(osgNormal, *matrix);
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osgNormal.normalize();
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*(normal_itr++) = osgNormal;
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// Average the normals on the shared vertex.
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remappedFace.index[i] = newIndex;
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osg::Vec3f normal = (*normals)[newIndex];
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normal += remappedFace.normal;
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normal.normalize();
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(*normals)[newIndex] = normal;
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}
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geom->setNormalArray(osg_normals.get());
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geom->setNormalBinding(osg::Geometry::BIND_PER_PRIMITIVE);
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else
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{
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// Find a split vertex chained from newIndex which has the 'same' normal.
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int sharedVertexIndex = newIndex;
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do
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{
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osg::Vec3f normal = (*normals)[sharedVertexIndex];
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float normalDifference = (remappedFace.normal - normal).length2();
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if (normalDifference < 1e-6) break;
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sharedVertexIndex = splitVertexChain[sharedVertexIndex];
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} while (sharedVertexIndex != -1);
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if (sharedVertexIndex == -1)
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{
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// When different normals on a shared vertex required, split the vertex.
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int splitVertexIndex = vertices->size();
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remappedFace.index[i] = splitVertexIndex;
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vertices->push_back((*vertices)[newIndex]);
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normals->push_back(remappedFace.normal);
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if (texCoords)
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{
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texCoords->push_back((*texCoords)[newIndex]);
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}
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splitVertexChain[newIndex] = splitVertexIndex;
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splitVertexChain.push_back(-1);
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}
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else
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{
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// When normals on shared vertex are identical (or very similar), keep it shared.
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remappedFace.index[i] = sharedVertexIndex;
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}
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}
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}
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}
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static bool addFace(
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const Lib3dsMesh* mesh,
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RemappedFace& remappedFace,
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osg::Geometry* geometry,
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std::vector<int>& origToNewMapping,
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std::vector<int>& splitVertexChain,
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const VertexParams& params)
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{
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if (isFaceValid(mesh, remappedFace.face))
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{
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addVertex(mesh, remappedFace, 0, geometry, origToNewMapping, splitVertexChain, params);
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addVertex(mesh, remappedFace, 1, geometry, origToNewMapping, splitVertexChain, params);
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addVertex(mesh, remappedFace, 2, geometry, origToNewMapping, splitVertexChain, params);
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return true;
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}
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else
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{
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// Avoids crash with corrupted files.
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remappedFace.face = NULL;
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return false;
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}
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}
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/**
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use matrix to pretransform geometry, or NULL to do nothing
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*/
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osg::Drawable* ReaderWriter3DS::ReaderObject::createDrawable(Lib3dsMesh *m,FaceList& faceList, const osg::Matrix * matrix, StateSetInfo & ssi, bool smoothVertexNormals)
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{
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// Avoid creating geoms for empty face list because otherwise osg asserts/crashes during render traversal.
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if (faceList.empty()) return NULL;
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osg::Geometry * geom = new osg::Geometry;
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VertexParams params;
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params.matrix = matrix;
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params.smoothNormals = smoothVertexNormals;
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std::vector<RemappedFace> remappedFaces(faceList.size());
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scoped_array<Lib3dsVector> normals( new Lib3dsVector[m->nfaces] ); // Temporary array
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lib3ds_mesh_calculate_face_normals(m, normals.get());
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osg::ref_ptr<osg::Vec3Array> osg_vertices = new osg::Vec3Array();
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osg_vertices->reserve(m->nvertices);
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geom->setVertexArray(osg_vertices);
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osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array();
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osg_normals->reserve(m->nvertices);
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geom->setNormalArray(osg_normals.get());
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geom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
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osg::ref_ptr<osg::Vec2Array> osg_texCoords = NULL;
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if (m->texcos)
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{
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osg_texCoords = new osg::Vec2Array();
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osg_texCoords->reserve(m->nvertices);
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geom->setTexCoordArray(0, osg_texCoords.get());
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// Texture 0 parameters (only one texture supported for now)
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if (ssi.lib3dsmat && *(ssi.lib3dsmat->texture1_map.name)) // valid texture = name not empty
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{
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Lib3dsTextureMap & tex3ds = ssi.lib3dsmat->texture1_map;
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params.scaleUV = osg::Vec2f(tex3ds.scale[0], tex3ds.scale[1]);
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params.offsetUV = osg::Vec2f(tex3ds.offset[0], tex3ds.offset[1]);
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if (tex3ds.rotation != 0) OSG_NOTICE << "3DS texture rotation not supported yet" << std::endl;
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//TODO: tint_1, tint_2, tint_r, tint_g, tint_b
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}
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}
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// The map between lib3ds mesh vertex indices and remapped osg vertices.
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std::vector<int> origToNewMapping(m->nvertices, -1);
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// If osg vertices need to be split to hold a different vertex normal,
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// splitVertexChain allows us to look them up.
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std::vector<int> splitVertexChain;
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splitVertexChain.reserve(m->nvertices);
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unsigned int faceIndex = 0;
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unsigned int faceCount = 0;
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for (FaceList::iterator itr = faceList.begin();
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itr != faceList.end();
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++itr, ++faceIndex)
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{
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osg::Vec3 normal = copyLib3dsVec3ToOsgVec3(normals[*itr]);
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if (matrix) normal = osg::Matrix::transform3x3(normal, *(params.matrix));
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normal.normalize();
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Lib3dsFace& face = m->faces[*itr];
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remappedFaces[faceIndex].face = &face;
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remappedFaces[faceIndex].normal = normal;
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if (addFace(m, remappedFaces[faceIndex], geom, origToNewMapping, splitVertexChain, params))
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{
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++faceCount;
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}
|
||||
}
|
||||
|
||||
// 'Shrink to fit' all vertex arrays because potentially faceList refers to fewer vertices than the whole mesh.
|
||||
// This will almost certainly be the case where mesh has been broken down into smoothing groups.
|
||||
if (osg_vertices.valid() && osg_vertices->size() < osg_vertices->capacity()) osg_vertices->trim();
|
||||
if (osg_normals.valid() && osg_normals->size() < osg_normals->capacity()) osg_normals->trim();
|
||||
if (osg_texCoords.valid() && osg_texCoords->size() < osg_texCoords->capacity()) osg_texCoords->trim();
|
||||
|
||||
// Set geometry color to white.
|
||||
osg::ref_ptr<osg::Vec4ubArray> osg_colors = new osg::Vec4ubArray(1);
|
||||
(*osg_colors)[0].set(255,255,255,255);
|
||||
geom->setColorArray(osg_colors.get());
|
||||
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
|
||||
|
||||
// create primitives
|
||||
int numIndices = faceList.size()*3;
|
||||
osg::ref_ptr<DrawElementsUShort> elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES,numIndices);
|
||||
// Create triangle primitives.
|
||||
int numIndices = faceCount * 3;
|
||||
osg::ref_ptr<DrawElementsUShort> elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES, numIndices);
|
||||
DrawElementsUShort::iterator index_itr = elements->begin();
|
||||
|
||||
for (fitr=faceList.begin();
|
||||
fitr!=faceList.end();
|
||||
++fitr)
|
||||
for (unsigned int i = 0; i < remappedFaces.size(); ++i)
|
||||
{
|
||||
Lib3dsFace& face = m->faces[*fitr];
|
||||
|
||||
if (face.index[0]>=orig2NewMapping.size() ||
|
||||
face.index[1]>=orig2NewMapping.size() ||
|
||||
face.index[2]>=orig2NewMapping.size()) continue; // Avoids crash with corrupted files
|
||||
|
||||
*(index_itr++) = orig2NewMapping[face.index[0]];
|
||||
*(index_itr++) = orig2NewMapping[face.index[1]];
|
||||
*(index_itr++) = orig2NewMapping[face.index[2]];
|
||||
RemappedFace& remappedFace = remappedFaces[i];
|
||||
if (remappedFace.face != NULL)
|
||||
{
|
||||
*(index_itr++) = remappedFace.index[0];
|
||||
*(index_itr++) = remappedFace.index[1];
|
||||
*(index_itr++) = remappedFace.index[2];
|
||||
}
|
||||
}
|
||||
|
||||
geom->addPrimitiveSet(elements.get());
|
||||
@ -1196,6 +1287,16 @@ ReaderWriter3DS::StateSetInfo ReaderWriter3DS::ReaderObject::createStateSet(Lib3
|
||||
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
|
||||
}
|
||||
|
||||
// Set back face culling state if single sided material applied.
|
||||
// This seems like a reasonable assumption given that the backface cull option
|
||||
// doesn't appear to be encoded directly in the 3DS format, and also because
|
||||
// it mirrors the effect of code in 3DS writer which uses the the face culling
|
||||
// attribute to determine the state of the 'two_sided' 3DS material being written.
|
||||
if (!mat->two_sided)
|
||||
{
|
||||
stateset->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK));
|
||||
}
|
||||
|
||||
/*
|
||||
osg::ref_ptr<osg::Texture> texture1_mask = createTexture(&(mat->texture1_mask),"texture1_mask",textureTransparancy);
|
||||
osg::ref_ptr<osg::Texture> texture2_map = createTexture(&(mat->texture2_map),"texture2_map",textureTransparancy);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user