CGTalk - Glass and F-Prime

lede

04-11-2004, 05:27 AM

Today I was working on some glass textures and it seems the way I used to do glass is causing a problem with F-Prime. I've attached an image that has the results from F-Prime and Lightwave. The LW render is fine the glass looks normal. The F-Prime render is not transperent and doesn't look right. Has anyone else run into this problem?

-Lee

roguenroll

04-11-2004, 06:40 AM

i think there have been a few errors with the new version, try to triple that surface, I think I heard that working.

architook

04-11-2004, 07:23 AM

Fprime always traces transparency, so it follows the Ray Recursion limit. Make sure it's at something like 16, not at 1 or 2.

LW does not follow the limit unless you have Trace Transparency on.

If your ray limit is small, it would explain why fprime is dark and LW is not

CourtJester

04-11-2004, 10:02 AM

I second architook's call... check recursion.

lede

04-11-2004, 03:36 PM

I'm not sure which suggestion worked. I originally tried each suggestion and the render didn't work. While I was getting the images to post here from F-Prime it fixed itself and here is what I got:

http://admin.etekworld.com/images/articles/110/Render_error03.jpg

I'll try and experiment with this so I can tell everyone which technique worked. Right now I have Ray Recursion at 16 and the glass tessilated.

Thanks for the help it is much appreciated.

-Lee

lede

04-11-2004, 08:43 PM

After carfully testing my glass surfaces today here is what I found. The Recursion was the problem. I had set it to 2 and when I reset it back to 16 the glass worked fine. I also played around with that number to see if I could help speed the render up a little. The majic number for my glass was 4 or above and it would render fine.

Thanks for the help :)

-Lee

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