bool Frustum::cull_sphere( const float* pos, float radius ) const
{
// Check the distance of the center to the planes
for( uint32_t i = 0; i < 6; ++i )
{
if(plane_dist_to_point(m_planes[i].m_data, pos) > radius)
return true;
}
return false;
}
static unsigned int
calc_lod(heightfield hf, vector3 *patch_pos)
{
int i;
float d = plane_dist_to_point(&hf->cam->ftm.near, patch_pos);
i = (int)((d/1000)*4);
if(i>3)
i = 3;
else if(i<0)
i=0;
return i;
}
bool Frustum::cull_box( const float* min, const float* max ) const
{
// Idea for optimized AABB testing from www.lighthouse3d.com
for( uint32_t i = 0; i < 6; ++i )
{
const float* n = m_planes[i].m_data;
float positive[3] = { min[0], min[1], min[2] };
if( n[0] <= 0 ) positive[0] = max[0];
if( n[1] <= 0 ) positive[1] = max[1];
if( n[2] <= 0 ) positive[2] = max[2];
if(plane_dist_to_point(n, positive) > 0)
return true;
}
return false;
}
bool Frustum::cull_frustum( const Frustum &frust ) const
{
for( uint32_t i = 0; i < 6; ++i )
{
bool allOut = true;
for( uint32_t j = 0; j < 8; ++j )
{
if(plane_dist_to_point(m_planes[i].m_data, frust.m_corners[j].m_vec) < 0)
{
allOut = false;
break;
}
}
if( allOut ) return true;
}
return false;
}
