void InstBoundingVolume::Draw()
  {
    glUseProgram(GLOBALS->program_id);

    glPushMatrix();

    glTranslatef(centroid.x, centroid.y, centroid.z);
    if(type == BVT_OBB || type == BVT_PCA_ELLIPSOID)
    {
      glRotatef(rotation->x, 1.0f, 0.0f, 0.0f);
      glRotatef(rotation->y, 0.0f, 1.0f, 0.0f);
      glRotatef(rotation->z, 0.0f, 0.0f, 1.0f);

      glRotatef(rotatoid.x, 1.0f, 0.0f, 0.0f);
      glRotatef(rotatoid.y, 0.0f, 1.0f, 0.0f);
      glRotatef(rotatoid.z, 0.0f, 0.0f, 1.0f);
    }
    if(type == BVT_AABB || type == BVT_OBB || type == BVT_PCA_ELLIPSOID)
      glScalef(half_extents.x*2.0f, half_extents.y*2.0f, half_extents.z*2.0f);
    else
      glScalef(radius*2.0f, radius*2.0f, radius*2.0f);

    SFW::Shape::DrawWireFrame(shape);

    glPopMatrix();

    glUseProgram(0);
  }