Radian to Degree

\[Degree = Radian \times\left(\frac{180^\circ}{\pi}\right)\]

[Link] Physically Based Rendering

Collecting links for Physically Based Rendering

PBRT
http://www.pbrt.org/index.php

Mituba - Physically Based Renderer
http://www.mitsuba-renderer.org/

Octane Render
http://render.otoy.com/

DONTNOD specular chart
=========================

http://seblagarde.wordpress.com/2012/04/30/dontnod-specular-and-glossiness-chart/

http://seblagarde.wordpress.com/2014/04/14/dontnod-physically-based-rendering-chart-for-unreal-engine-4/

[Maya] iff Z buffer channel sequence writes other image format

fchek can not read sequence of iff Z buffer for default option.
but, It can read it when it use command line version.
like this.
fcheck -Z -n 0 100 1 c:/tmp/test.#.iff