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Ray Tracing Complex Objects Using Octrees
https://www.cs.swarthmore.edu/~jcarste1/pdfs/octree.pdf
The nal aspect of the Octree implementation is the ray-octree intersection that needs to be calculated in order to know which leaf nodes are pierced by a ray. This is done by taking the ray parametric function: r x(t) = p x + td x r y(t) = p y + td y r z(t) = p z + td z We know that an intersection has occured if there exists one t that satis es: x 0(o) r x(t) < x 1(o) y
IMPLEMENTING RAY TRACING WITH OCTREES AND …
https://www.cs.umd.edu/~hjs/pubs/SameCG89.pdf
Abstract--A ray tracing implementation is described that is based on an octree representation of a scene. Rays are traced through the scene by calculating the blocks through which they pass. This calculation is performed in a bottom-up manner through the use of neighbor finding. The octrees are assumed to be
Ray Tracing an Octree: Numerical Evaluation of the First …
https://onlinelibrary.wiley.com/doi/10.1111/1467-8659.1240199
This idea is applied recursively starting from the root of the octree; the novelty of the approach consists of the fact that the choice of each node's child in the octree is directly derived from the intersection of the ray-segment within the tested sub-octant, thus avoiding searching for any neighbouring nodes. The problem of selecting the correct octant while using the commonly …
Interactive Isosurface Ray Tracing of Large Octree …
http://sci.utah.edu/~wald/Publications/2006/OctIso/download/octiso.pdf
For general ray tracing, octrees lack the nonrecursive traversal of grids, or ability of kd-trees and BVHs to adapt to overlapping polygonal scene geometry. Volume rendering, however, guarantees regularly-spaced, non-overlapping voxels, which are directly used to …
Interactive Isosurface Ray Tracing of Large Octree Volumes
https://collections.lib.utah.edu/dl_files/1d/58/1d589a03a725c9d894a3866ad32f1386f0613f9d.pdf
For general ray tracing, octrees lack the nonrecursive traversal of grids, or ability of kd-trees and BVHs to adapt to overlapping polygonal scene geometry. Volume rendering, however, guarantees regularly spaced, non-overlapping voxels, which are directly used to …
Octree-R: An Adaptive Octree for Efficient Ray Tracing
https://www.researchgate.net/publication/3410767_Octree-R_An_Adaptive_Octree_for_Efficient_Ray_Tracing
We propose the Octree-R, an octree-variant data structure for efficient ray tracing. The algorithm for constructing the Octree-R first estimates the number of ray-object intersection tests. Then,...
Voxel Cone Tracing and Sparse Voxel Octree for Real-time …
https://on-demand.gputechconf.com/gtc/2012/presentations/SB134-Voxel-Cone-Tracing-Octree-Real-Time-Illumination.pdf
Voxel Cone Tracing and Sparse Voxel Octree for Real-time Global Illumination . Cyril Crassin . NVIDIA Research . Global Illumination Indirect effects Important for realistic image synthesis Direct lighting Direct+Indirect lighting . Voxel-Based GI 8ms @ 512x512 – 27ms @ 720p - …
xna - Octree raycasting/raytracing - Stack Overflow
https://stackoverflow.com/questions/6281415/octree-raycasting-raytracing-best-ray-leaf-intersection-without-recursion
Here's what it looks like when I stop at the root bounds, without using the DDA to traverse the tree: /* find which leaf, if any, the ray intersects. Returns transparency (Color (0,0,0,0)) if no intersection was found. TestValue is a shader constant parameter passed from the caller which is used to dynamically adjust the number of loops the ...
Octree | Insertion and Searching - GeeksforGeeks
https://www.geeksforgeeks.org/octree-insertion-and-searching/
Octree is a tree data structure in which each internal node can have at most 8 children. Like Binary tree which divides the space two segments, Octree divides the space into at most eight-part which is called as octanes. It is used to store the 3-D point which takes a large amount of space.
Using octree for cheking intersection of ray and meshes
https://computergraphics.stackexchange.com/questions/8874/using-octree-for-cheking-intersection-of-ray-and-meshes
Using octree for cheking intersection of ray and meshes 0 I wrote the code for checking intersection of ray and meshes on scene. It consist of two parts - broad phase and narrow phase. In broad phase I build an oriented bounding box around each mesh and check intersection of ray with boxes.
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