Optics in FreeCAD

Show off your FreeCAD projects here!
denisb
Posts: 5
Joined: Wed Mar 15, 2017 1:08 pm

Re: Optics in FreeCAD

Postby denisb » Fri Mar 17, 2017 7:59 am

DeepSOIC wrote:Got an image of some stuff through the lens!
lens-scene 2 render.png
On AMD Radeon 7700 and with regular mouse, CADRays is behaving much much better, and makes a nice rendering faster.


Thank you so much for testing the app. It is great to see the first real user!

Regarding your rendering, it seems that the number of bounces (3 by default) is insufficient for complete processing of all inter-reflections in the lens. Please try to increase it at least to 8-10 (on render settings tab).
chrisb
Posts: 1649
Joined: Tue Mar 17, 2015 9:14 am

Re: Optics in FreeCAD

Postby chrisb » Fri Mar 17, 2017 8:02 am

Very impressive! although I wouldn't hire you yet to make my next pair of glasses, Mr. David Hamilton! :)
Last edited by chrisb on Fri Mar 17, 2017 1:46 pm, edited 1 time in total.
DeepSOIC
Posts: 4466
Joined: Fri Aug 29, 2014 12:45 am
Location: Saint-Petersburg, Russia

Re: Optics in FreeCAD

Postby DeepSOIC » Fri Mar 17, 2017 11:06 am

denisb wrote:Regarding your rendering, it seems that the number of bounces (3 by default) is insufficient for complete processing of all inter-reflections in the lens. Please try to increase it at least to 8-10 (on render settings tab).
Yep. With 3 bounces, I saw no image on screen at all. The last image was rendered with 5 bounces.

When setting up lens material, I wanted to give it a bit of glassy look, which isn't easy in this dark-room lighting conditions. I played with scatter color, but I didn't notice any effect at all. Maybe my number of bounces was too low?.. I also played with "thickness" "density" (tooltip says it's lambert-beer absorption coefficient). First, absorption should have its color customizable. Second, it doesn't appear to do anything at all. It doesn't say, what unit it is in... I tried bumping it up to 10000, and observed no image intensity drop...

The look of the lens was made by adding some emissivity to glass material.
realthunder
Posts: 103
Joined: Tue Jan 03, 2017 10:55 am

Re: Optics in FreeCAD

Postby realthunder » Sat Mar 18, 2017 8:03 am

DeepSOIC wrote:Got an image of some stuff through the lens!
On AMD Radeon 7700 and with regular mouse, CADRays is behaving much much better, and makes a nice rendering faster.

:o That's very impressive! I actually saw this post long time ago, and was hoping at that time I may some day venture into optics. Unfortunately, that day hasn't come yet.

I am curious of your profession. I had thought maybe you are an electronics guy or something because of your username I guess.