Multibounce Glints

Description

This code implements the key ideas of the Siggraph Asia 2020 paper:

"Path Cuts: Efficient Rendering of Pure Specular Light Transport", by

Beibei Wang, Miloš Hašan, Ling-Qi Yan.

It's under the framework of Mitsuba and a new utils plug-in named mbglints is added. There are two kinds of input for the mesh: the shape from XML, or a height field from the commandline.

Heightfield as input:

mtsutil.exe mbglints xmlFile output.exr heightfield.exr hfScale bounceCount errorThreshold

Mesh as input: mtsutil.exe mbglints xmlFile output.exr bounceCount errorThreshold

Usage:

The code is under the framework of Mitsuba Renderer 0.5. It's only tested on Windows, so not sure about Mac OS. To compile this code, please use the following steps:

1. Find a dependencies for Mitsuba in the website of Mitsuba renderer, and then make it under the folder mitsuba.

2. Use CMake 2.8 to generate a solution of VS 2013. (We found CMake 3.0+ does not work in our case).

3. Open the solution, and then build it.

Example:

We also provided a testing scene with height field as input. With the provided script, the scene could be rendered directly.

The XML can be found here, an input normal map can be found here and a binary (Windows) can be found here.

The command is also shown here:

mtsutil.exe mbglints xml\doubleSlabOursReflect.xml doubleslabR_ours.exr xml\heightField\isotropic512.exr 1 1 0.001