Advanced

Ray Accelerator : Efficient and Flexible Ray Tracing on a Heterogeneous Architecture

Barringer, R. LU ; Andersson, M. LU and Akenine-Möller, T. LU (2016) In Computer Graphics Forum
Abstract

We present a hybrid ray tracing system, where the work is divided between the CPU cores and the GPU in an integrated chip, and communication occurs via shared memory. Rays are organized in large packets that can be distributed among the two units as needed. Testing visibility between rays and the scene is mostly performed using an optimized kernel on the GPU, but the CPU can help as necessary. The CPU cores typically handle most or all shading, which makes it easy to support complex appearances. For efficiency, the CPU cores shade whole batches of rays by sorting them on material and shading each material using a vectorized kernel. In addition, we introduce a method to support light paths with arbitrary recursion, such as multiple... (More)

We present a hybrid ray tracing system, where the work is divided between the CPU cores and the GPU in an integrated chip, and communication occurs via shared memory. Rays are organized in large packets that can be distributed among the two units as needed. Testing visibility between rays and the scene is mostly performed using an optimized kernel on the GPU, but the CPU can help as necessary. The CPU cores typically handle most or all shading, which makes it easy to support complex appearances. For efficiency, the CPU cores shade whole batches of rays by sorting them on material and shading each material using a vectorized kernel. In addition, we introduce a method to support light paths with arbitrary recursion, such as multiple recursive Whitted-style ray tracing and adaptive sampling where the result of a ray is examined before sending the next, while still batching up rays for the benefit of GPU-accelerated traversal and vectorized shading. This allows our system to achieve high rendering performance while maintaining the flexibility to accommodate different rendering algorithms.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Graphics hardware, Hardware, I.3.2 [Computer Graphics]: Graphics Systems-, I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Ray tracing, Ray tracing, Rendering, Rendering systems
in
Computer Graphics Forum
publisher
Wiley-Blackwell
external identifiers
  • scopus:84995957218
ISSN
0167-7055
DOI
10.1111/cgf.13071
language
English
LU publication?
yes
id
140cb1cc-0330-473b-95cb-2ad93e369606
date added to LUP
2017-04-24 15:16:09
date last changed
2017-04-24 15:16:09
@article{140cb1cc-0330-473b-95cb-2ad93e369606,
  abstract     = {<p>We present a hybrid ray tracing system, where the work is divided between the CPU cores and the GPU in an integrated chip, and communication occurs via shared memory. Rays are organized in large packets that can be distributed among the two units as needed. Testing visibility between rays and the scene is mostly performed using an optimized kernel on the GPU, but the CPU can help as necessary. The CPU cores typically handle most or all shading, which makes it easy to support complex appearances. For efficiency, the CPU cores shade whole batches of rays by sorting them on material and shading each material using a vectorized kernel. In addition, we introduce a method to support light paths with arbitrary recursion, such as multiple recursive Whitted-style ray tracing and adaptive sampling where the result of a ray is examined before sending the next, while still batching up rays for the benefit of GPU-accelerated traversal and vectorized shading. This allows our system to achieve high rendering performance while maintaining the flexibility to accommodate different rendering algorithms.</p>},
  author       = {Barringer, R. and Andersson, M. and Akenine-Möller, T.},
  issn         = {0167-7055},
  keyword      = {Graphics hardware,Hardware,I.3.2 [Computer Graphics]: Graphics Systems-,I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Ray tracing,Ray tracing,Rendering,Rendering systems},
  language     = {eng},
  month        = {10},
  publisher    = {Wiley-Blackwell},
  series       = {Computer Graphics Forum},
  title        = {Ray Accelerator : Efficient and Flexible Ray Tracing on a Heterogeneous Architecture},
  url          = {http://dx.doi.org/10.1111/cgf.13071},
  year         = {2016},
}