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Regular voxel grids and RTX accelerated ray tracing
https://computergraphics.stackexchange.com/questions/9025/regular-voxel-grids-and-rtx-accelerated-ray-tracing
Acceleration Data Structures for Ray Tracing
https://dspace.mit.edu/bitstream/handle/1721.1/86191/6-837-fall-2003/contents/lecture-notes/8_grid_acc.pdf
Acceleration Data Structures for Ray Tracing. MIT EECS 6.837, Durand and Cutler Today • Review & Schedule • Motivation – Distribution Ray Tracing ... insert primitives into grid for each ray r find initial cell c(i,j), t min, t next_v & t next_h compute dt v, dt h, sign x and sign y while c!= NULL for each primitive p in c
Acceleration Data Structures for Ray Tracing
https://www.cs.tau.ac.il/~dcor/Graphics/pdf.slides/RT_acceleration2016.pdf
uniform grid of cubes “voxels”. –Each voxel stores a list of all objects at least partially contained in it. –Given a ray, voxels are traversed using a 3D variant of the 2D line drawing algorithms. –At each voxel the ray is tested for intersection with the primitives stored therein –Once an intersection has been found, there is no need
09 grid acceleration - Massachusetts Institute of …
https://groups.csail.mit.edu/graphics/classes/6.837/F04/lectures/09_grid_acceleration.pdf
• Motivation – Distribution Ray Tracing • Bounding Boxes • Spatial Acceleration Data Structures – Regular Grid – Adaptive Grids – Hierarchical Bounding Volumes • Flattening the Transformation Hierarchy MIT EECS 6.837, Durand and Cutler Regular Grid MIT EECS 6.837, Durand and Cutler Cell (i, j) Create Grid • Find 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 –Soft shadows –Antialiasing (getting rid of jaggies) –Glossy reflection ... insert primitives into grid for each ray r find initial cell c(i,j), tmin, tnext_x & tnext_y compute dtx, dty, signx and signy while c!= NULL for each primitive p …
Grid Creation Strategies for Efficient Ray Tracing
https://www.sci.utah.edu/~thiago/papers/rgrid.pdf
Acceleration structures are used in ray tracing to improve the time needed to compute ray-scene intersections at the expense of in-creased preprocessing time [1]. Popular methods include hierar-chical spatial subdivision (e.g., octrees and k-d trees), hierarchical objectsubdivision(e.g. boundingvolumehierarchies),anduniform
Grid Creation Strategies for Efficient Ray Tracing
https://www.sci.utah.edu/~thiago/papers/rgrid_slides.pdf
Uniform Grid Acceleration Structure • We use the standard 3D uniform grid for ray tracing (examples are in 2D for simplicity) • Use cubical shaped cells • Choose number of cells in each dimension according to: d is the diagonal of the object (length) N is number of triangles (primitives) k is a user supplied parameter n x = d x 3! kN d x d y d z n y = d y 3! kN d x d y d z
Ray Tracing II • Ray tracing acceleration structures
https://www.cs.cornell.edu/courses/cs4620/2008fa/lectures/16raytracing2.pdf
Ray tracing acceleration • Ray tracing is slow. This is bad! –Ray tracers spend most of their time in ray-surface intersection methods • Ways to improve speed –Make intersection methods more efficient •Yes, good idea. But only gets you so far –Call intersection methods fewer times •Intersecting every ray with every object is wasteful
08 grid accelerationCLASS - groups.csail.mit.edu
https://groups.csail.mit.edu/graphics/classes/6.837/F03/lectures/08_grid_acceleration.pdf
• Motivation – Distribution Ray Tracing • Bounding Boxes • Spatial Acceleration Data Structures – Regular Grid – Adaptive Grids – Hierarchical Bounding Volumes • Flattening the transformation hierarchy MIT EECS 6.837, Durand and Cutler Regular Grid MIT EECS 6.837, Durand and Cutler Cell (i, j) Create grid • Find bounding box ...
The Splitted Grid { An acceleration structure for ray …
https://www.marc-kastner.com/publication/2013_bachelorthesis/content/thesis.pdf
Abstract. Uniform Grids are commonly employed acceleration structures for speeding up ray tracing. Unfortunately, the classic Grid su ers from several problems such as a high memory footprint, the inability to handle clustered geometry (tea-pot-in-a-stadium problem) and a scaling linear to its resolution.
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