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Introduction

houdini-pbrt-v3 is a pbrt-v3 scene exporter for SideFX's Houdini. The goal is to support pbrt's feature-set using standing Houdini workflows. Additionally the implementation should be easily extensible to support experimental branches of pbrt.

Requirements

• Houdini 16.5 (other versions may also work)
• pbrt-v3 tested against master branch

Installation

The easiest way to install houdini-pbrt-v3 is to unzip (or git clone) into your $HOME/houdini16.5 directory. Please see Installation for more details.

TODOs

• Finish AreaLightSources
• Shapes
• Volumes
• Textures
• Materials

Considerations

• Left vs Right handed coordinate system.
  Houdini is right handed, and pbrt is left handed. This is actually quite standard and its common to flip the z of camera space. However proper testing is required in that some parts of pbrt might not work well with negative scales within the system.
  • https://www.okino.com/conv/exp_xof.htm
  • https://www.gamedev.net/forums/topic/385001-converting-a-transformation-matrix-from-right-handed-to-left-handed-coord-system/?page=2

Possible Bugs?

• Disk Shape and AreaLights, seems to emit from opposite side (-z by default). ReverseOrientation doesn't seem to fix it, but a Scale 1 1 -1 does.