Previous screenshots created for an easy mini Maya and Mental Ray lighting, shading and rendering tutorial to troubleshoot the Maya software and Mental Ray render engine to help 3d artists to overcome the bugs caused by the poor Maya and Mental Ray integration.
https://blog.mentalray.com/2017/09/25/nvidia-mental-ray-for-maya-2018-now-available/
https://www.irayplugins.com/iray-for-maya/
http://download.autodesk.com/us/maya/2011help/mr/shaders/architectural/arch_camera.html
http://elementalray.wordpress.com/2011/11/30/unified-sampling-visually-for-the-artist/
http://elementalray.wordpress.com/2012/04/15/unified-sampling-in-3-10-more/
http://elementalray.wordpress.com/2012/05/07/the-user_ibl-shaders-pt1/