Long render times due to back face rendering?

Started by moodflow, June 05, 2007, 04:38:39 pm

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moodflow

June 05, 2007, 04:38:39 pm Last Edit: June 05, 2007, 04:41:10 pm by moodflow
Hi All,

I was noticing during a render the other day, that TGTP was also rendering areas that were normally occluded, like the backs of mountains, hills, and rocks, which added to the render times.  If it did not try to render these areas, the render would likely have taken half the time**. 

Is there a way to turn this feature off?

**If rendering of occluded areas was removed, and then support for multicore processors is implimented, renders would be closer to bareable!  I remember reading a while back that there were some optimizations planned for the renderer itself, which could bring the rendertimes down even more (or hold it the same, but increase the quality).  Is this true?



http://www.moodflow.com
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Oshyan

There is significant optimization still to be done. Some "back face culling" is done presently but it is conservative. Optimization of culling routines, multithreading, and other changes should bring render times down a good amount. Just how much remains to be seen, but you can expect a good performance boost in the final product to be sure.

- Oshyan

moodflow

Thanks Oshyan!

I remember seeing that function in the TG 0.9.

Is there a current way to turn it off in TGTP?
http://www.moodflow.com
mood-inspiring images and music

Oshyan

As far as I know you can't control back face culling in TG2 at this point. You certainly can't make it better - that will require changes to the render engine itself. Did you want to turn it off for some reason?

- Oshyan

Kevin F

Quote from: Oshyan on June 05, 2007, 06:13:23 pm
As far as I know you can't control back face culling in TG2 at this point. You certainly can't make it better - that will require changes to the render engine itself. Did you want to turn it off for some reason?

- Oshyan


err..... speed springs to mind!
Kevin


Oshyan

No, you'd want to turn it on/up to gain speed, not off. ;D As I said before though this is something that will have to be dealt with in future adjustments to the rendering engine.

- Oshyan

Kevin F

Quote from: Oshyan on June 06, 2007, 03:22:08 am
No, you'd want to turn it on/up to gain speed, not off. ;D As I said before though this is something that will have to be dealt with in future adjustments to the rendering engine.

- Oshyan


Sorry we have minor confusion here! I was thinking in terms of moodflows original question :
" I was noticing during a render the other day, that TGTP was also rendering areas that were normally occluded, like the backs of mountains, hills, and rocks, which added to the render times.  If it did not try to render these areas, the render would likely have taken half the time**.

Is there a way to turn this feature off?"

We have a double negative here!  i.e Turning off the rendering of these parts is culling. But I think the question meant turning the rendering of unwanted parts off! i.e. turning culling on! Does this make sense?!! ;D

Oshyan

Yeah, that makes sense. Once we'd established what the feature was called I thought we were then talking about turning it off/on. ;D

- Oshyan

moodflow

Heheh - off or on, whichever way we can speed up rendertimes ;-)
http://www.moodflow.com
mood-inspiring images and music

buchvecny

lol u would both had to get your medicine if this dialogue was said in some madhouse

rcallicotte

LOL   ;D

Quote from: buchvecny on June 13, 2007, 05:48:16 pm
lol u would both had to get your medicine if this dialogue was said in some madhouse
So this is Disney World.  Can we live here?

JimB

SPAM!!!

See what happens when you mention medicines in a thread  ;)
Some bits and bobs
The Galileo Fallacy, 'Argumentum ad Galileus':
"They laughed at Galileo. They're laughing at me. Therefore I am the next Galileo."

Nope. Galileo was right for the simpler reason that he was right.

jmclusky

Quote from: JimB on January 09, 2009, 04:53:49 am
SPAM!!!

See what happens when you mention medicines in a thread  ;)


Thanks for the report :-)

moodflow

Wow, how did this dusty old thread resurface?   ;)
http://www.moodflow.com
mood-inspiring images and music