//Calculate which faces to draw given a position & frustum
void BSP::CalculateVisibleFaces(const VECTOR3D & cameraPosition, FRUSTUM frustum)
{
//Clear the list of faces drawn
facesToDraw.ClearAll();
//calculate the camera leaf
int cameraLeaf=CalculateCameraLeaf(cameraPosition);
int cameraCluster=leaves[cameraLeaf].cluster;
//loop through the leaves
for(int i=0; i<numLeaves; ++i)
{
//if the leaf is not in the PVS, continue
if(!isClusterVisible(cameraCluster, leaves[i].cluster))
continue;
//if this leaf does not lie in the frustum, continue
if(!frustum.IsBoundingBoxInside(leaves[i].boundingBoxVertices))
continue;
//loop through faces in this leaf and mark them to be drawn
for(int j=0; j<leaves[i].numFaces; ++j)
{
facesToDraw.Set(leafFaces[leaves[i].firstLeafFace+j]);
}
}
}
//Calculate which faces to draw given a position & frustum
void BSP::CalculateVisibleFaces(const XYZ &cameraPosition_xyz, FRUSTUM &frustum, BITSET &segmentMask)
{
if (disable_vis) return;
//Clear the list of faces drawn
if (single_cluster)
{
if (!show_all) segmentMask.clearAll();
}
else
{
if (!show_all) leafActive.clearAll();
}
VECTOR3D cameraPosition;
cameraPosition.x = cameraPosition_xyz.x;
cameraPosition.y = cameraPosition_xyz.y;
cameraPosition.z = cameraPosition_xyz.z;
//calculate the camera leaf
int cameraLeaf=CalculateCameraLeaf(cameraPosition);
int cameraCluster=leaves[cameraLeaf].cluster;
//loop through the leaves
for(int i=0; i<numLeaves; ++i)
{
//if the leaf is not in the PVS, continue
if(!isClusterVisible(cameraCluster, leaves[i].cluster))
continue;
//if this leaf does not lie in the frustum, continue
if(!frustum.isBoundingBoxInside(leaves[i].boundingBoxVertices))
continue;
//loop through faces in this leaf and mark them to be drawn
if (single_cluster)
{
for(int j=0; j<leaves[i].numFaces; ++j)
{
//facesToDraw.Set(leafFaces[leaves[i].firstLeafFace+j]);
int faceNumber = leafFaces[leaves[i].firstLeafFace+j];
if (faceDirectory[faceNumber].faceType==bspPolygonFace)
{
int polygonFaceNumber = faceDirectory[faceNumber].typeFaceNumber;
// printf("polygonFaces[polygonFaceNumber].segmentIndex: %d\n",polygonFaces[polygonFaceNumber].segmentIndex);
if (polygonFaces[polygonFaceNumber].segmentIndex)
{
segmentMask.set(polygonFaces[polygonFaceNumber].segmentIndex);
}
}
if (faceDirectory[faceNumber].faceType==bspPatch)
{
int polygonFaceNumber = faceDirectory[faceNumber].typeFaceNumber;
// printf("patches[polygonFaceNumber].segmentIndex: %d\n",patches[polygonFaceNumber].segmentIndex);
if (patches[polygonFaceNumber].segmentIndex)
{
segmentMask.set(patches[polygonFaceNumber].segmentIndex);
}
}
if (faceDirectory[faceNumber].faceType==bspMeshFace)
{
int polygonFaceNumber = faceDirectory[faceNumber].typeFaceNumber;
// printf("meshFaces[polygonFaceNumber].segmentIndex: %d\n",meshFaces[polygonFaceNumber].segmentIndex);
if (meshFaces[polygonFaceNumber].segmentIndex)
{
segmentMask.set(meshFaces[polygonFaceNumber].segmentIndex);
}
}
}
}
else
{
leafActive.set(i);
}
}
}