radiance software package provides Lighting Simulation and Rendering System, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install radiance
radiance is installed in your system.
Make ensure the radiance package were installed using the commands given below,
$ sudo dpkg-query -l | grep radiance *
You will get with radiance package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Graphics |
| Package | radiance |
| Version | 4R1+20120125-1.1 |
| Description | Lighting Simulation and Rendering System |
| Sub Section | Graphics |