Ray-tracing

Data Types
type	mod_ray_tracing::t_ray
	Definition of a ray. More...
type	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.
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).
pure subroutine, public	mod_ray_tracing::rt_transform_aligned_axis_bounding_box (corner, transformation)
	Transform an aligned-axis bounding-box (AABB).
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.
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.

Detailed Description

Ray-tracing tools

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 )

Test the intersection of a ray and an aligned-axis bounding-box (AABB).

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_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 )

Generate the difference of two lists of ray intersections.

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 )

Generate the union of two lists of ray intersections.

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_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 )

Initialize a ray from origin and direction only.

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(t_cg_transformation), intent(in)	transformation )

Transform an aligned-axis bounding-box (AABB).

Parameters

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