C++ (Cpp) Vec3Array::front Examples

Example #1

File: Normals.cpp Project: amhagan/osg

void Normals::MakeNormalsVisitor::apply( Geode &geode )
{
    for( unsigned int i = 0; i < geode.getNumDrawables(); i++ )
    {
        Geometry *geom = dynamic_cast<Geometry *>(geode.getDrawable(i));
        if( geom )
        {
            if (geom->containsDeprecatedData()) geom->fixDeprecatedData();
            
            Vec3Array *coords   = dynamic_cast<Vec3Array*>(geom->getVertexArray());
            if( coords == 0L )
                continue;

            Vec3Array *normals  = dynamic_cast<Vec3Array*>(geom->getNormalArray());
            if( normals == 0L )
                continue;

            Geometry::AttributeBinding binding = geom->getNormalBinding();
            if( binding == Geometry::BIND_OFF )
                continue;

            if( binding == Geometry::BIND_OVERALL )
            {
                Vec3 v(0,0,0);
                Vec3 n = normals->front();

                Vec3Array::iterator coord_index = coords->begin();
                while( coord_index != coords->end() )
                  v += *(coord_index++) * _mat;
                v /= (float)(coords->size());

                n *= _normal_scale;
                _local_coords->push_back( v );
                _local_coords->push_back( (v + n));
            }
            else // BIND_PER_PRIMITIVE_SET, BIND_PER_VERTEX
            {
                Geometry::PrimitiveSetList& primitiveSets = geom->getPrimitiveSetList();
                Geometry::PrimitiveSetList::iterator itr;

                Vec3Array::iterator coord_index   = coords->begin();
                Vec3Array::iterator normals_index = normals->begin();

                for(itr=primitiveSets.begin(); itr!=primitiveSets.end(); ++itr)
                {
#ifdef DEBUG
                    _printPrimitiveType( (*itr).get() );
#endif
                    if( binding == Geometry::BIND_PER_PRIMITIVE_SET )
                    {
                        Vec3 v(0,0,0);
                        Vec3 n = *(normals_index++);
                        int ni = (*itr)->getNumIndices();
                        for( int i = 0; i < ni; i++ )
                            v += *(coord_index++) * _mat;
                        v /= (float)(ni);

                        n *= _normal_scale;
                        _local_coords->push_back( v );
                        _local_coords->push_back( (v + n));
                    }
                    else
                    {
                        switch((*itr)->getMode())
                        {
                            case(PrimitiveSet::TRIANGLES):
                            {
                                for( unsigned int j = 0; j < (*itr)->getNumPrimitives(); j++ )
                                {
                                    _processPrimitive( 3, coord_index, normals_index, binding );
                                    coord_index += 3;
                                    normals_index+=3;
                                }
                                break;
                            }
                            case(PrimitiveSet::TRIANGLE_STRIP):
                            {
                                for( unsigned int j = 0; j < (*itr)->getNumIndices()-2; j++ )
                                {
                                    _processPrimitive( 3, coord_index, normals_index, binding );
                                    coord_index++;
                                    normals_index++;
                                }
                                coord_index += 2;
                                if( binding == Geometry::BIND_PER_VERTEX )
                                    normals_index += 2;
                                break;
                            }
                            case(PrimitiveSet::TRIANGLE_FAN):
                                break;

                            case(PrimitiveSet::QUADS):
                            {
                                for( unsigned int j = 0; j < (*itr)->getNumPrimitives(); j++ )
                                {
                                    _processPrimitive( 4, coord_index, normals_index, binding );
                                    coord_index += 4;
                                    normals_index +=4;
                                }
                                break;
                            }
                            case(PrimitiveSet::QUAD_STRIP):
                                break;

                            case(PrimitiveSet::POLYGON):
                            {
                                DrawArrayLengths* dal = dynamic_cast<DrawArrayLengths*>((*itr).get());
                                if (dal) {
                                    for (unsigned int j = 0; j < dal->size(); ++j) {
                                        unsigned int num_prim = (*dal)[j];
                                        //OSG_WARN << "j=" << j << " num_prim=" << num_prim << std::endl;
                                        _processPrimitive(num_prim, coord_index, normals_index, binding);
                                        coord_index += num_prim;
                                        normals_index += num_prim;
                                    }
                                }
                                break;
                            }

                            default:
                                break;
                        }
                    }
                }
            }
        }
    }
    traverse( geode );
}