The angle between the cone axis and a line on its surface should be arccos(1-p), if I am not mistaken.

(p is your percentage expressed as a ratio, so 40% is 0.4)

I deleted my previous two posts. It was all my bad. I was trying to render a scene before adding any objects to the povray project. If I add objects first, everything works like a charm. Thanks for your patience.

My POV-Ray output parameters in the Raytracing Preferences window are
+P +A
I don't think the +O parameter ever was there.

I have tried raytracing with the new release candidate and I am still getting the raytracing error on Windows, which was supposed to be fixed recently. I have put more details into the raytracing thread:

viewtopic.php?f=3&t=6848

I have installed the new release candidate and I now have OS: Windows 7 Word size: 64-bit Version: 0.14.3683 (Git) Branch: master Hash: 382e055e9b2d3159de79e3f56ef452b538b51012 Python version: 2.7.6 Qt version: 4.8.5 Coin version: 4.0.0a SoQt version: 1.6.0a OCC version: 6.6.0 I tried one-click rend...

Why is there OCC version 6.6.0? I was hoping we would get 6.7.1 with the new release.

This works. The only weird thing is that it creates a file called raytrace.bmp.png, if that's of any importance.

Well, it still doesn't work, giving me the following: Traceback (most recent call last): File "<input>", line 1, in <module> File "C:\Program Files (x86)\FreeCAD 0.14\bin\python26.zip\subprocess.py", line 444, in call File "C:\Program Files (x86)\FreeCAD 0.14\bin\python26.zi...

OS: Windows 7 Platform: 32-bit Version: 0.14.3389 Python version: 2.6.2 Qt version: 4.5.2 Coin version: 3.1.0 SoQt version: 1.4.1 OCC version: 6.5.1 I am trying to render a project. I am able to export it to a file and open with Povray. However, when I try to render straight from FreeCAD by clicking...

You have to call
Inercia.Calc_Inercia("Soporte_Superior",1)
or use
from Inercia import Calc_Inercia