public void If_the_ray_points_at_the_AABB_the_result_is_true_and_the_distance_is_set_correctly()
{
var box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
var ray = new Ray(new Point(-1, 1, 1), new Vector(1, 0.1, 0.2).ToUnitVector());
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
public void If_the_ray_points_at_the_AABB_the_result_is_true_and_the_distance_is_set_correctly()
{
var box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
var ray = new Ray(new Point(-1, 1, 1), new Vector(1, 0.1, 0.2).ToUnitVector());
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
public void If_the_ray_does_not_point_at_the_AABB_the_result_is_false_and_the_distance_is_set_to_infinity()
{
var box = new AxisAlignedBoundingBox(new Point(1, 1, 1), new Point(2, 2, 2));
var ray = new Ray(new Point(0.5, -1, 2), -Vector.UnitY);
Assert.False(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
public void If_the_AABB_is_behind_the_ray_the_result_is_false_and_the_distance_is_set_to_infinity()
{
var box = new AxisAlignedBoundingBox(new Point(1, 1, 1), new Point(2, 2, 2));
var ray = new Ray(new Point(0, 0, 3), Vector.UnitZ);
Assert.False(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
public Intersection FindClosestIntersectionWith(Ray ray)
{
Intersection closest = null;
if (_left != null && _leftBounds.IntersectsRay(ray, 0, double.PositiveInfinity))
{
closest = _left.FindClosestIntersectionWith(ray);
}
if (_right != null && _rightBounds.IntersectsRay(ray, 0, (closest != null) ? closest.Distance : double.PositiveInfinity))
{
closest = Intersection.Closest(closest, _right.FindClosestIntersectionWith(ray));
}
return(closest);
}
public void For_ray_directions_with_zeros_the_result_is_still_true_for_valid_intersections()
{
var box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
var ray = new Ray(new Point(-1, 1, 1), Vector.UnitX);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
ray = new Ray(new Point(1, -1, 1), Vector.UnitY);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
ray = new Ray(new Point(1, 1, -1), Vector.UnitZ);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
public void For_ray_directions_with_zeros_the_result_is_still_true_for_valid_intersections()
{
var box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
var ray = new Ray(new Point(-1, 1, 1), Vector.UnitX);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
ray = new Ray(new Point(1, -1, 1), Vector.UnitY);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
box = new AxisAlignedBoundingBox(new Point(0, 0, 0), new Point(2, 2, 2));
ray = new Ray(new Point(1, 1, -1), Vector.UnitZ);
Assert.True(box.IntersectsRay(ray, 0, double.PositiveInfinity));
}
/// <summary>
/// TODO: This method is BUTT SLOW. For now it just loops over all of the triangles in the mesh and returns the closest intersection...
/// </summary>
public Intersection FindClosestIntersectionWith(Ray ray)
{
if (_boundingBox == null)
{
_boundingBox = GetBoundingBox();
}
if (!_boundingBox.IntersectsRay(ray, 0, double.PositiveInfinity))
{
return(null);
}
return(Triangles
.Select(triangle => triangle.FindClosestIntersectionWith(ray))
.WhereNotNull()
.OrderBy(intersection => intersection.Distance)
.FirstOrDefault());
}