/// <summary>
/// Computes an intersection of the line and the ray
/// </summary>
public static bool LineRay(Vector2 lineOrigin, Vector2 lineDirection, Vector2 rayOrigin, Vector2 rayDirection,
out IntersectionLineRay2 intersection)
{
Vector2 rayOriginToLineOrigin = lineOrigin - rayOrigin;
float denominator = VectorE.PerpDot(lineDirection, rayDirection);
float perpDotA = VectorE.PerpDot(lineDirection, rayOriginToLineOrigin);
if (Mathf.Abs(denominator) < Geometry.Epsilon)
{
// Parallel
float perpDotB = VectorE.PerpDot(rayDirection, rayOriginToLineOrigin);
if (Mathf.Abs(perpDotA) > Geometry.Epsilon || Mathf.Abs(perpDotB) > Geometry.Epsilon)
{
// Not collinear
intersection = IntersectionLineRay2.None();
return(false);
}
// Collinear
intersection = IntersectionLineRay2.Ray(rayOrigin);
return(true);
}
// Not parallel
float rayDistance = perpDotA / denominator;
if (rayDistance > -Geometry.Epsilon)
{
intersection = IntersectionLineRay2.Point(rayOrigin + rayDirection * rayDistance);
return(true);
}
intersection = IntersectionLineRay2.None();
return(false);
}
/// <summary>
/// Computes an intersection of the line and the ray
/// </summary>
public static bool LineRay(Vector2 lineOrigin, Vector2 lineDirection, Vector2 rayOrigin, Vector2 rayDirection,
out IntersectionLineRay2 intersection)
{
float lineDistance;
float rayDistance;
var intersectionType = LineLine(lineOrigin, lineDirection, rayOrigin, rayDirection, out lineDistance, out rayDistance);
if (intersectionType == IntersectionType.Line)
{
intersection = IntersectionLineRay2.Ray(rayOrigin);
return(true);
}
if (intersectionType == IntersectionType.Point && rayDistance > -Geometry.Epsilon)
{
intersection = IntersectionLineRay2.Point(rayOrigin + rayDirection * rayDistance);
return(true);
}
intersection = IntersectionLineRay2.None();
return(false);
}