Translations:Raytracing tutorial/4/en

Requirements

 * FreeCAD version 0.16 or above
 * POV-Ray and/or LuxRender is installed on the system
 * In the case of POV-Ray, it's not enough to have just the binary executable in place, but it also requires the installation of supporting files, and in Ubuntu these are provided by the Recommends-flagged package povray-includes. Potential issues have also been seen with Linux installations requiring local configuration files to be manually created in a user's home folder, as discussed here.
 * In the case of POV-Ray, installation of psicofil's macro is recommended
 * The reader has the basic knowledge to use the Part and PartDesign Workbenches