CS 6620 Fall 2014 - Project 11
Comparison of gamma corrected and uncorrected images: 00:41:54
I ended up playing with gamma correction and having it implemented before it got bumped
to the next project so I put together a comparison. The gamma correction is done by
converting the linear RGB values the
render is computed with to sRGB values, since the sRGB color space includes a gamma correction
term and is a common and well supported color space. The left (brighter) is the corrected image, the right
is uncorrected. Both images were rendered with path tracing and adaptive sampling with a min 128
and max of 1024 samples per pixel.
The scene uses the ordered polymesh version of
Killeroo and the high res
Utah teapot. The Killeroo model is using a measured brass material from the
MERL BRDF Database and the sphere uses a measured gold material
from PBRT's material spd files.
SmallPT Cornell Box w/ MERL BRDFS: 00:52:35
Adaptive sampling: min 128, max 1024
The MERL scene makes use of the Stanford Dragon and Happy Buddha from the Stanford 3D Scanning Repository. The material BRDFS are from the MERL BRDF Database introduced in the paper "A Data-Driven Reflectance Model" by Wojciech Matusik, Hanspeter Pfister, Matt Brand and Leonard McMillan. The dragon uses the blue acrylic BRDF, the buddha uses the gold metallic paint1 BRDF and the sphere uses the red fabric BRDF.
Fabric SmallPT Cornell Box: 00:45:52
Adaptive sampling: min 128, max 1024
The fabric box scene makes use of the Stanford Bunny from the Stanford 3D Scanning Repository and the high res Utah teapot. The material BRDFS are from the MERL BRDF Database. The walls are using the red/white/blue fabric BRDFS, the teapot is using red metallic paint and the bunny is using color changing paint2.
Hardware Used and Other Details
Render times were measured using std::chrono::high_resolution_clock and only include time to render,
ie. time to load the scene and write the images to disk is ignored. Images were rendered with path tracing
using 32 threads with work divided up in 8x8 blocks. A different machine was used to render the images
since my computer at home was out of commission when rendering the scenes.
RAM: Forgot to check
Compiler: gcc 4.9.1 x86_64 (on OpenSUSE)
Compilation Flags: -m64 -O3 -march=native -flto