/// <summary>
/// Returns information about an intersection between a ray and a plane
/// </summary>
public static Line3Intersection GetRayIntersection( Ray3 ray, Plane3 plane )
{
float startDot = plane.Normal.Dot( ray.Origin );
float diffDot = plane.Normal.Dot( ray.Direction );
if ( !Utils.CloseToZero( diffDot ) )
{
float t = ( startDot + plane.Distance ) / -diffDot;
if ( t >= 0 )
{
Line3Intersection result = new Line3Intersection( );
result.IntersectedObject = plane;
result.IntersectionPosition = ray.Origin + ( ray.Direction * t );
result.IntersectionNormal = plane.Normal;
result.Distance = t;
return result;
}
}
return null;
}
/// <summary>
/// Returns information about an intersection between a ray, and a plane defined by a point and a normal
/// </summary>
public static Line3Intersection GetRayIntersection( Ray3 ray, Point3 pt, Vector3 vec )
{
float startDot = vec.Dot( ray.Origin );
float diffDot = vec.Dot( ray.Direction );
if ( !Utils.CloseToZero( diffDot ) )
{
float d = -vec.Dot( pt );
float t = ( startDot + d ) / -diffDot;
if ( t >= 0 )
{
Line3Intersection result = new Line3Intersection( );
result.IntersectedObject = null;
result.IntersectionPosition = ray.Origin + ( ray.Direction * t );
result.IntersectionNormal = vec;
result.Distance = t;
return result;
}
}
return null;
}
