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View Full Version : Max 5: Has anybody seen this problem with bump mapping and light tracer?

TNTJack
11-24-2002, 06:08 PM
I posted a while ago about the same subject, with no replies at all. Perhaps now more people are using Max 5, and can tell me if they have the same problem when using bump mapping and light tracer simultaneously.

This is rendered with Brazil latest public beta:

http://uploader.axsstudios.com/images/01bumpwithbrazil.jpg

And this is has been rendered with Max 5 scanline:

http://uploader.axsstudios.com/images/01scantracer.jpg

I tried to use similar settings on both renderers.

You can see the artifacts on the sides perpendicular to the view. Any idea about why this happens?

Thank you.
Teknoholic
11-25-2002, 07:58 PM
Wierd. I haven't seen that. Maybe it has something to do with the bump amount, or the light tracer settings. Don't give up on LT! It's the bomb!
CapnPanic
11-25-2002, 09:44 PM
maybe try enabling the supersampler for that material? it's just a guess, but it sort of looks like the bump map is being poorly sampled...might be worth a try :)
Rice
11-25-2002, 11:00 PM
It's hard to say without posting your settings.

Increase the Rays/Sample and Filter Size. Defaults are 250 and .5 respectively. Also turn off Adaptive Undersampling and Decrease your subdivisions, use show samples to see where your sampling is taking place. Try that and post again. :)
TNTJack
11-26-2002, 11:24 PM
Thanks for your replies.

I just needed to apply supersampling in the material editor. Any of these supersampling methods will increase the quality, being Max 2.5 Star the less proccesor intensive.

I guess that Brazil has one supersampling method applied by default.

Thanks!
LionHeartX2
11-27-2002, 04:27 AM
Oh man TNT thanks for this post man, ive had the same problem and its even drivin me to move to lightwave becuase of this. Im not at home right now but is there any special settings you had to put when you enabled super samplimg
spacefrog
11-27-2002, 07:03 AM
That Max has bad Bumpmapping-antialiasing is well know since it's first release, especially high bump-values make the bumptexture crawl horrible, if the object is moved during an animation or so.
The supersampling method is the solution for this - or a third partyrenderer - where you have many many options in max

;-)
Chris Thomas
11-27-2002, 01:25 PM
Brazil uses adaptive sampling, that is, it can sample each pixel a number of times, this results in both texture antialiasing and edge antialiasing. This makes it inherantly slower than max's scanline, but also insures higher quality AA and material sampling, as can be seen in this example above.
This sampling is one of themain reasons that Brazil has such a high image quality as it ensure's high fidelity in areas of high tonal contrast and the greatest cause of this is bump mapping. However, Brazil also has the option of rendering one sample per pixel or even one sample per 4,18 pixels etc (undersampling), this is very usefull for rough tests and will often render with raytracing faster than max's scanline.
Another good test of quality is if the skylight system will shade bumps correctly in purely skylight areas. I know Brazil does this and Mental Ray does not. Havent tested it with Max's system yet though.
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