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Bounding boxes - Ray Tracer Challenge
http://raytracerchallenge.com/bonus/bounding-boxes.html
Scenario Outline: Intersecting a ray with a bounding box at the origin Given box ← bounding_box (min = point (-1, -1, -1) max = point (1, 1, 1)) And direction ← normalize (<direction>) And r ← ray (<origin>, direction) Then intersects (box, r) is <result> Examples: | origin | direction | result | | point (5, 0.5, 0) | vector (-1, 0, 0) | true | | point (-5, 0.5, 0) | vector (1, 0, 0) | true | | point (0.5, 5, 0) | …
Ray Tracing | NVIDIA Developer
https://developer.nvidia.com/discover/ray-tracing
Bounding Volume Hierarchy (BVH) is a popular ray tracing acceleration technique that uses a tree-based “acceleration structure” that contains multiple hierarchically-arranged bounding boxes (bounding volumes) that encompass or surround different amounts of scene geometry or primitives. Testing each ray against every primitive intersection in the scene is inefficient and …
Ray-Box Intersection - Scratchapixel
https://www.scratchapixel.com/lessons/3d-basic-rendering/minimal-ray-tracer-rendering-simple-shapes/ray-box-intersection
Such a box is called an axis-aligned box or an axis-aligned bounding box (AABB). Boxes which are not oriented along the axis of a cartesian coordinate system are called oriented bounding box (OBB). Computing the intersection of a ray with an AABB is quite simple. All we need is to remember that a straight line can be defined as: $$y = mx + b$$
Fast, Branchless Ray/Bounding Box Intersections - tavianator.com
https://tavianator.com/2011/ray_box.html
Axis-aligned bounding boxes (AABBs) are universally used to bound finite objects in ray-tracing. Ray/AABB intersections are usually faster to calculate than exact ray/object intersections, and allow the construction of bounding volume hierarchies (BVHs) which reduce the number of objects that need to be considered for each ray.
Creating Optimal Meshes for Ray Tracing | NVIDIA …
https://developer.nvidia.com/blog/creating-optimal-meshes-for-ray-tracing/
When tracing a ray against the mesh and traversing the acceleration structure, this leads to many failed intersection tests before finding the triangle that is hit by the ray (Figure 1). Figure 1. A simplified illustration of an elongated triangle and its bounding box compared to a more evenly shaped triangle and its bounding box.
Advanced Ray Tracing - University of Utah
https://my.eng.utah.edu/~cs4600/lectures/Wk13_AdvancedRayTracing.pdf
Ray-tracing Acceleration • Motivation –Distribution Ray Tracing • Bounding Boxes • Spatial Acceleration Data Structures –Regular Grid –Adaptive Grids –Hierarchical Bounding Volumes • Flattening the Transformation Hierarchy Bounding Volume Hierarchy • Find bounding box of objects • Split objects into two groups • Recurse
Ray Tracing: Intersection
https://www.cs.rit.edu/~jmg/courses/cgII/20041/slides/7-1-rayTracingIntersect.pdf
Ray Tracing - Bounding Volumes • Place simple objects (i.e., sphere or box) around complex objects – Suitability depends on object being enclosed! • Do initial intersection tests on bounding objects. • If ray intersects bounding volume, then test complex bounded object • Can be nested
c++ - Ray tracing box intersections - Stack Overflow
https://stackoverflow.com/questions/8903356/ray-tracing-box-intersections
I'm using this code to test for intersections: http://pastebin.com/qgm6vpdx (It's a recursive function, t is the distance to the intersection point) The bounding box is defined as: Cube* c1 = new Cube; c1->Corner1 = Vec3 (100, 100, 100); c1->Corner2 = Vec3 (200, 200, 200); I've confirmed that the camera is not inside the cube.
Fast, Branchless Ray/Bounding Box Intersections, Part 2: …
https://tavianator.com/2015/ray_box_nan.html
In part 1, I outlined an algorithm for computing intersections between rays and axis-aligned bounding boxes.The idea to eliminate branches by relying on IEEE 754 floating point properties goes back to Brian Smits in 1, and the implementation was fleshed out by Amy Williams. et al. in 2.. To quickly recap, the idea is to replace the naïve slab method:
A Ray-Box Intersection Algorithm
https://www.jcgt.org/published/0007/03/04/paper-lowres.pdf
as bounding-box (AABB/OBB) volumes for more detailed geometry. While much of the literature on ray-box intersection is concerned with bounding volume hierarchies for visible surface ray tracing, in practice the applications of ray-box intersection are more diverse: • AABB for bounding volume hierarchy (BVH) traversal to support ray-triangle in-
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