i guess it was lost in translation. i tried blender again, after i made this thread. i also tried it in the past. for everyone saying switch from keyshot to blender, that takes a level of skill i don't have or a level of time i'm not willing to put in.
once i get a new laptop, i think the new keyshot will work better. after keyshot 7 the ui will not work with a 1366x768 screen size. at least for me it won't.
i appreciate the suggestions. i'm going to stick with keyshot.
Surfing around web I founded this one a bit old but compatible with CAD software and import IGES STEP and Brep and source available.
and it's Freeware ;)
On Linux WineHQ, seem not working on my notebook but Yes is version with GUI there is a little tutorial, but the render engine zip folder is dated March 9, 2017. a bit old..
In fact not too difficult the CadRays! :)
And ultra speed!
And can import directly iges & Step file from Moi!
I was affraid by the Command line...but not used it! :)
Just a little logo on the left corner...