source engine bsp TracePointInLeaf

dleaf_t* CMapParser::TracePointInLeaf ( const Vector3& vPoint )
{
    int node = 0;

    while ( node >= 0 )
    {
        dnode_t* pNode = &m_nodeList[node];
        dplane_t* pPlane = &m_planeList[pNode->planenum];

        if ( pPlane->normal.Dot ( vPoint ) <= pPlane->dist )
        {
            node = pNode->children[1];
        }
        else
        {
            node = pNode->children[0];
        }
    }

    return &m_leafList[-node - 1];
}