internal override sealed void Trace( Ray ModelRay, ShapeHitCollection ShapeHits )
{
Debug.Assert( ShapeHits != null );
ShapeHitList Hits = new ShapeHitList( ShapeHits );
Trace( ModelRay, ref Hits );
}
protected override void Trace( Ray ModelRay, ref ShapeHitList Hits )
{
Vector oc = Center - ModelRay.Origin;
float l2oc = Vector.DotProduct( oc, oc );
float dp = Vector.DotProduct( ModelRay.Direction, ModelRay.Direction );
if ( l2oc <= RadiusSquared ) // Inside the sphere
{
float tca = Vector.DotProduct( oc, ModelRay.Direction );
float l2hc = ( RadiusSquared - l2oc ) / dp + tca * tca;
float t = tca + (float)Math.Sqrt( l2hc );
Hits.Add( t, SphereInsideFaceIndex );
}
else
{
float tca = Vector.DotProduct( oc, ModelRay.Direction ) / dp;
if ( tca >= 0.0f )
{
float l2hc = ( RadiusSquared - l2oc ) / dp + tca * tca;
float t = tca - (float)Math.Sqrt( l2hc );
if ( l2hc > 0.0f ) // Hits Sphere
{
Hits.Add( t, SphereOutsideFaceIndex );
}
}
}
}
protected override void Trace( Ray ModelRay, ref ShapeHitList Hits )
{
float dp = Vector.DotProduct( ModelRay.Direction, Normal );
float distance = -Vector.DotProduct( ModelRay.Origin - P0, Normal ) / dp;
// If the distnace traveled is less than zero, misses the plane
if ( distance <= 0.0f )
{
return;
}
if ( dp > 0.0f ) // Hits front
{
Hits.Add( distance, PlaneFrontFaceIndex );
}
else // Hits back
{
Hits.Add( distance, PlaneBackFaceIndex );
}
}
protected abstract void Trace( Ray ModelRay, ref ShapeHitList Hits );
