PDA

View Full Version : Problem with Exterior Lighting(Mental Ray)

navidmilan
04-03-2008, 04:36 PM
i am creating an animation(just zoom back and no object moving) from a historic scene with Mental Ray's daylight system(max 2008).i want to render it as realistic as i can. here are some attampts with different render settings.the problem is dark area under the roof which i point it in images. i also post my light and render settings.can anyone give me some advise for better exterior rendering?
and for animation render i want to render whole animation every 10th frame for final gather map(setting in images) and then freez it for final rendering. if i am wrong, guide me please.(sky will be add with compositing)

Sample images:
Bounces2 (http://www.sharemation.com/navidmilan/MR%20post/Far-Bounces2.jpg?)
Bounces5 (http://www.sharemation.com/navidmilan/MR%20post/Far-Bounces5.jpg?)
Sample max4 (http://www.sharemation.com/navidmilan/MR%20post/Near-Maximum4.jpg?)
Sample max16 (http://www.sharemation.com/navidmilan/MR%20post/Near-Maximum16.jpg?)

Setting images:
Render (http://www.sharemation.com/navidmilan/MR%20post/Render%20setting.jpg?)
Daylight (http://www.sharemation.com/navidmilan/MR%20post/Daylight%20setting.jpg?)
Environment (http://www.sharemation.com/navidmilan/MR%20post/Environment%20Setting.jpg?)

sorry for my Bad english
JeffPatton
04-03-2008, 11:49 PM
I think the extreme contrast is coming from your log. exposure control settings where you have the contrast set to 100. I'd recommend using the mr photographic exposure control instead of the log. exposure control...it should really help your contrast issue.

And yes, you are correct in the way you describe the render every Nth frame for the animation.
Brian-Bradley
04-04-2008, 12:26 AM
Hi Navid,

Do you have your gamma options on and set up
in Max?

Regards
Bri
navidmilan
04-04-2008, 04:59 PM
I think the extreme contrast is coming from your log. exposure control settings where you have the contrast set to 100. I'd recommend using the mr photographic exposure control instead of the log. exposure control...it should really help your contrast issue.
yes,you are right,Contrast 100 in logarythmic exposure bring me more contrast but 100 percent was because of washed out bitmaps in my scene , so i increase the contrast option to have better colors...

"Do you have your gamma options on and set up
in Max? "
no i don't and now my gamma correction setting:
http://www.sharemation.com/navidmilan/MR%20post/Gamma%20correction2.jpg?

tell me if anything is wrong.i will render the scene(tomorrow) with new gamma setting and offcource another exposure control...
JeffPatton
04-07-2008, 01:33 AM
You shouldn't use an adjusted system gamma with the log. exposure control because it 'acts' like an adjusted gamma. So if you use both log. exposure AND an adjusted system gamma you'll end up with a washed out image. Now, you'll still need to adjust your bitmap gamma...Look, bottom line, again I urge you to use the photographic exposure control instead of the logarithmic exposure. The photographic exposure will provide better results (IMHO) and less headaches with your gamma settings.
sgruesen
05-06-2008, 06:55 AM
i have max 9 so... but anyway, i picked up on your comment about contrast 100 b/c of washed out colors. the best solution i've found for that is to open up the diffuse map, scroll down to output and enable the color ramp, then add a bezier point or convert the two existing points to besier smooth and adjust the strait diagonal line to a curved line. another trick i use is to lower the rgb output. that's a lot like using curve settings in photo editing software.
CGTalk Moderation
05-06-2008, 06:55 AM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.