Method _drawSolidPolyhedron

Engine/source/gfx/gfxDrawUtil.cpp:1005–1093

}

void GFXDrawUtil::_drawSolidPolyhedron( const GFXStateBlockDesc &desc, const AnyPolyhedron &poly, const ColorI &color, const MatrixF *xfm )
{
   GFXDEBUGEVENT_SCOPE( GFXDrawUtil_DrawSolidPolyhedron, ColorI::GREEN );

   const U32 numPoints = poly.getNumPoints();
   const Point3F* points = poly.getPoints();
   const PlaneF* planes = poly.getPlanes();
   const Point3F viewDir = GFX->getViewMatrix().getForwardVector();

   // Create a temp buffer for the vertices and
   // put all the polyhedron's points in there.

   GFXVertexBufferHandle< GFXVertexPCT > verts( mDevice, numPoints, GFXBufferTypeVolatile );
   verts.lock();
   for( U32 i = 0; i < numPoints; ++ i )
   {
      verts[ i ].point = points[ i ];
      verts[ i ].color = color;
   }

   if( xfm )
   {
      for( U32 i = 0; i < numPoints; ++ i )
         xfm->mulP( verts[ i ].point );
   }
   verts.unlock();

   // Allocate a temp buffer for the face indices.

   const U32 numIndices = poly.getNumEdges() * 3;
   const U32 numPlanes = poly.getNumPlanes();

   GFXPrimitiveBufferHandle prims( mDevice, numIndices, 0, GFXBufferTypeVolatile );

   // Unfortunately, since polygons may have varying numbers of
   // vertices, we also need to retain that information.

   FrameTemp< U32 > numIndicesForPoly( numPlanes );
   U32 numPolys = 0;

   // Create all the polygon indices.

   U16* indices;
   prims.lock( &indices );
   U32 idx = 0;
   for( U32 i = 0; i < numPlanes; ++ i )
   {
      // Since face extraction is somewhat costly, don't bother doing it for
      // backfacing polygons if culling is enabled.

      if( !desc.cullDefined || desc.cullMode != GFXCullNone )
      {
         F32 dot = mDot( planes[ i ], viewDir );

         // See if it faces *the same way* as the view direction.  This would
         // normally mean that the face is *not* backfacing but since we expect
         // planes on the polyhedron to be facing *inwards*, we need to reverse
         // the logic here.