Ray-tracing

Data Types
interface	mod_ray_tracing::t_ray
	Definition of a ray. More...
interface	mod_ray_tracing::t_intersection
	Definition of an intersection. More...
type	mod_ray_tracing::t_intersection_list
	Sorted list of intersections. More...

Functions/Subroutines
pure type(t_ray) function	mod_ray_tracing::rt_ray_partial_initialization (origin, direction)
	Initialize a ray from origin and direction only. More...
pure subroutine	mod_ray_tracing::rt_intersection_apply_transformation (intersection, transformation, ray, has_normal)
	Apply transformation to the intersection and compute the distance. More...
pure type(t_intersection) function	mod_ray_tracing::rt_intersection_partial_initialization (point, distance)
	Initialize an interface from point and distance only. More...
logical pure function, public	mod_ray_tracing::rt_does_ray_hit_aligned_axis_bounding_box (ray, corner)
	Test the intersection of a ray and an aligned-axis bounding-box (AABB). More...
pure subroutine, public	mod_ray_tracing::rt_transform_aligned_axis_bounding_box (corner, transformation)
	Transform an aligned-axis bounding-box (AABB). More...
pure subroutine, public	mod_ray_tracing::rt_intersection_list_union (list1, list2, is_inside1, is_inside2, union)
	Generate the union of two lists of ray intersections. More...
pure subroutine, public	mod_ray_tracing::rt_intersection_list_difference (list1, list2, is_inside1, is_inside2, difference)
	Generate the difference of two lists of ray intersections. More...

Detailed Description

Function/Subroutine Documentation

rt_does_ray_hit_aligned_axis_bounding_box()

logical pure function, public mod_ray_tracing::rt_does_ray_hit_aligned_axis_bounding_box	(	type(t_ray), intent(in)	ray,
		double precision, dimension(3,2), intent(in)	corner
	)

Reference:

• Williams, A., Barrus, S., Morley, R. K., & Shirley, P. (2005). An efficient and robust ray-box intersection algorithm. In ACM SIGGRAPH 2005 Courses (pp. 9-es). doi:[10.1145/1198555.1198748]

The corner(:,1) contains the minimal coordinates and corner(:,2) contains the maximal coordinates.

Parameters

[in]	ray	Ray.
[in]	corner	Corners of the AABB.

rt_intersection_apply_transformation()

pure subroutine mod_ray_tracing::rt_intersection_apply_transformation	(	class(t_intersection), intent(inout)	intersection,
		type(cg_transformation), intent(in)	transformation,
		type(t_ray), intent(in)	ray,
		logical, intent(in)	has_normal
	)

Parameters

[in,out]	intersection	Intersection.
[in]	transformation	transformation.
[in]	ray	ray in the original frame.
[in]	has_normal	Apply transformation to the normal.

rt_intersection_list_difference()

pure subroutine, public mod_ray_tracing::rt_intersection_list_difference	(	type(t_intersection_list), intent(in)	list1,
		type(t_intersection_list), intent(in)	list2,
		logical, intent(in)	is_inside1,
		logical, intent(in)	is_inside2,
		type(t_intersection_list), intent(out)	difference
	)

Parameters

[in]	list1,list2	Lists of ray intersections.
[in]	is_inside1,is_inside2	Is the origin of the ray inside or outside?
[out]	difference	Difference of list1 and list2.

rt_intersection_list_union()

pure subroutine, public mod_ray_tracing::rt_intersection_list_union	(	type(t_intersection_list), intent(in)	list1,
		type(t_intersection_list), intent(in)	list2,
		logical, intent(in)	is_inside1,
		logical, intent(in)	is_inside2,
		type(t_intersection_list), intent(out)	union
	)

Parameters

[in]	list1,list2	Lists of ray intersection.
[in]	is_inside1,is_inside2	Is the origin of the ray inside or outside?
[out]	union	Union of list1 and list2.

rt_intersection_partial_initialization()

pure type(t_intersection) function mod_ray_tracing::rt_intersection_partial_initialization	(	double precision, dimension(3), intent(in)	point,
		double precision, intent(in)	distance
	)

The normal vector is set to null vector.

Parameters

[in]	point	Intersection point
[in]	distance	Intersection distance

Returns

Initialized intersection

rt_ray_partial_initialization()

pure type(t_ray) function mod_ray_tracing::rt_ray_partial_initialization	(	double precision, dimension(3), intent(in)	origin,
		double precision, dimension(3), intent(in)	direction
	)

Parameters

[in]	origin	Origin of the ray
[in]	direction	Direction of the ray

Returns

Initialized ray

rt_transform_aligned_axis_bounding_box()

pure subroutine, public mod_ray_tracing::rt_transform_aligned_axis_bounding_box	(	double precision, dimension(3,2), intent(inout)	corner,
		type(cg_transformation), intent(in)	transformation
	)

Parameters

[in,out]	corner	Corners of the AABB.
[in]	transformation	Tranformation applied to the AABB.