/disneyanimation-cloud

A large and highly detailed volumetric cloud data set, intended to be used for various purposes, including movie and game production as well as research.

OtherNOASSERTION

Walt Disney Animation Studios Cloud Data Set


PACKAGE CONTENTS:

wdas_cloud.vdb : a heterogeneous volumetric cloud model containing density data
wdas_cloud_*.vdb : lower-resolution versions at half, quarter, eighth, and sixteenth resolution
wdas_cloud_hyperion_render.[exr|png] : an image of the volumetric cloud rendered in Disney's Hyperion renderer
wdas_cloud_mitsuba_scene.xml : an example Mitsuba scene for rendering the volumetric cloud
wdas_cloud_mitsuba_scene.[exr|png] : the rendered image produced using the Mitsuba scene


INSTRUCTIONS FOR MITSUBA:

To render the included example Mitsuba scene, compile Mitsuba with the following modification. In src/integrators/path/volpath_simple.cpp, line 288 (as of this writing), change the maximum value of the Russian-roulette survival probability from 0.95f to 1.0f to avoid overly aggressive termination of paths that results in high variance and fireflies. The scene requires the "mitsuba-vdb" plugin to load the data set. Mitsuba does not implement the algorithms and acceleration structures necessary to render high-albedo heterogeneous volumes efficienty; the included scene is intended as a reference.


LICENSING:

The contents of this package are Copyright 2017 Disney Enterprises, Inc. and are licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. A copy of this license is available at http://creativecommons.org/licenses/by-sa/3.0/. The volumetric cloud model used for reference is a photograph by Kevin Udy provided on the Colorado Clouds Blog at https://coclouds.com/436/cumulus/2012-07-26/ and licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License.