Physically Based Rendering

Downloads

Source Code Updates

The second patch release, fixing numerous small errors found since the book's release, and including the author-supplied plugins, is now available. The release notes describe all of the changes in this release. Source code is available in separate packages for Windows and Linux/Mac OSX:

For the Linux/Mac packages, the OpenEXR image libraries are no longer included and must be downloaded and installed separately. (If they aren't already available on your system).

If you need access to the 1.02 release, it is still available:

Tools From the Authors

These add-on tools enhance pbrt's functionality.

Mathematica to PBRT converter. This Mathematica package will export any 3D Mathematica graphics to a PBRT file, either ready to be rendered or geometry-only for inclusion in your scene. (Mathematica package, installation instruction inside)

Plugins From the Authors

These plugin modules extend pbrt to add interesting new functionality. To use any of these plugins, copy the corresponding source code file to the appropriate directory in your pbrt tree (e.g. lights/, shapes/, etc.) and update the makefile to build that file as well.

Improved photon mapping integrator: this plugin has numerous improvements to the basic photon mapping integrator described in Section 16.5 of Physically Based Rendering. In particular, final gathering is as much as seven times faster, there are fewer artifacts in the final images, and the distribution of rays used for final gathering better matches the indirect lighting distribution. (PDF describing implementation, C++ source code.)
Improved infinite area light source sampling: this plugin implements an improved importance sampling method for "infinite area lights", a.k.a. environment map light sources. This method substantially reduces variance in rendered images by accounting for the directional variation of brightness in the environment map. (PDF describing implementation, C++ source code.)
Debugging integrator: this plugin allows you to directly visualize certain intermediate calculations, such as the geometric or surface normals. VERY handy when you're trying to figure out why your scene is all screwy. It's very short, so hopefully its use is self-explanatory from the code. (C++ source code.)
"Instant global illumination": this plugin implements Wald et al's "instant global illumination" algorithm. This technique is effectively a bidirectional path tracing method that re-uses a small number of paths over all pixels in the image. It does so in a way that gives a result with no noise due to Monte Carlo variance, instead accepting correlation in error across all pixels in the image. It is extremely fast, often on the order of 20% slower than just rendering an image with direct illumination only. (PDF describing implementation, C++ source code.)

Contributed Plugins

Extended channel film: Jared Sohn has written an extended film plugin that writes out additional information at each pixel, including depth, world coordinates, the surface normal, and texture coordinates of the visible object.
Wavefront OBJ Shape: The prolific Mark Colbert has written a Shape implementation that loads a Wavefront OBJ files, turning them into triangle meshes for rendering. Get it from his pbrt goodies page.
Targa image film: Mark Colbert has also written a Film implementation that directly applies the imaging pipeline and writes out a TGA format image. This is also available from his pbrt goodies page.
Grid-based implicit surfaces: Robert Bridson has written a Shape plugin that renders implicit surfaces defined by a grid of densities.
PNG Film: Philip Rideout has written a Film plugin that writes images in PNG format.
CSG intersections: Philip has also written a CSG-based ray intersector for pbrt.

Exporters and Converters

Maya Exporter: Mark Colbert has written a Maya plugin to export scenes from Maya in the pbrt scene description format. Get it from his maya-pbrt page.