Bumpmapping problem with VIZ4 radiosity solution

samp · June 2nd, 2002

Quote:

here's the bump problem

no matter what setting I use, (even a bump intensity of 1) I get theses plotchy noisy artifacts once bumps are turned on
tweaking/cleaning the bump maps source didn't help

darth_shader: no regathering on the previous image (didn't improve much) and just one skysystem (skylight+sun)
filtering of the solution set to 2
rendering of solution + direct illumination (raytraced shadows)

That's the same problem I have with the sponza scene ...
Anyone that has a sollution for it?
I've tried everything ... (exept regathering, seems like my PC can't handle that, VIZ4 hangs when I try to render with it ...)

And if you ask me, Lightwave scores best in that content.
Man, what a results !
Super realistic !
Not even 1 VIZ4 image in the contest where I think : "Hmmm, is that a photo or a CG image?"

I hope Autodesk fixes this soon!

STRAT · June 2nd, 2002

well i've not yet used viz 4, only viz 3, but try this -

1) supersampling - try messing with these settings for the main material

2) material filtering - the standard is set to pyramidal, change this to summed area with a value of 0.5 Try this for both diffuse AND bump channels.

3) rendering filters - try a different render filter other than the standard area filter. try catmull-rom maybe.

Wojciech Klepacki · June 2nd, 2002

Hi SAMP!
U should use Radiosity Override in Material Editor. Try to change Indirect Bump Map Scale. Set this parameter much below default. The value between 0,2-0,4 often causes ViZ to produce nice (acceptable I mean) results. Best regards.

samp · June 2nd, 2002

I allrady tried it with 0,3 ...
Will try a lower vallue too

Frank · June 3rd, 2002

It looks like you need to set your refine iterations (all objects) higher. 2 is always a good number. It may take a little longer for the solution to run. But I think it should fix your problem.

Wojciech Klepacki · June 3rd, 2002

Hi Frank
I thing that refining iterations won't help, when u use regathering. I suggest u to decrease indirect light bump scale. Best regards. P.S. Here is nice tutorial http://www.alexcasanova.com/ (tutorials section)

nisus · June 3rd, 2002

Indeed wojcieh. Refining won't help when using regathering. Decreasing the indirect light bump scale will get the job done.

nisus

samp · June 3rd, 2002

I cannot use regathering since my VIZ4 hangs then on my old crappy PC

Btw, the example image here is NOT mine!
But I have he same problems.

And usualy I take 3 for refine itirations, so that'll do

June 2nd, 2002	#2 (permalink)
STRAT Super Moderator Join Date: Dec 2001 Location: Cardiff, Wales, UK. Age: 36 Posts: 6,488 Name: Stephen Leworthy	well i've not yet used viz 4, only viz 3, but try this - 1) supersampling - try messing with these settings for the main material 2) material filtering - the standard is set to pyramidal, change this to summed area with a value of 0.5 Try this for both diffuse AND bump channels. 3) rendering filters - try a different render filter other than the standard area filter. try catmull-rom maybe. __________________

June 2nd, 2002	#3 (permalink)
Wojciech Klepacki Senior Member Join Date: Apr 2002 Location: Poland Age: 38 Posts: 203 Name: Wojciech Klepacki	Hi SAMP! U should use Radiosity Override in Material Editor. Try to change Indirect Bump Map Scale. Set this parameter much below default. The value between 0,2-0,4 often causes ViZ to produce nice (acceptable I mean) results. Best regards. __________________ .:: regards ::. Wojciech Klepacki

June 3rd, 2002	#6 (permalink)
Wojciech Klepacki Senior Member Join Date: Apr 2002 Location: Poland Age: 38 Posts: 203 Name: Wojciech Klepacki	Hi Frank I thing that refining iterations won't help, when u use regathering. I suggest u to decrease indirect light bump scale. Best regards. P.S. Here is nice tutorial http://www.alexcasanova.com/ (tutorials section) __________________ .:: regards ::. Wojciech Klepacki

June 3rd, 2002	#7 (permalink)
nisus Super Moderator Join Date: Mar 2002 Location: Gent Flanders Belgium Europe Age: 32 Posts: 3,276 Name: Evert Vandenberghe	Indeed wojcieh. Refining won't help when using regathering. Decreasing the indirect light bump scale will get the job done. nisus __________________ www.ams.be / www.nisusarts.com http://www.youtube.com/profile_videos?user=nisusCGA&p=r

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June 2nd, 2002	#4 (permalink)
samp Member Join Date: Nov 2001 Location: Ghent, Belgium Posts: 99 Name: Lode Blomme	I allrady tried it with 0,3 ... Will try a lower vallue too

June 3rd, 2002	#5 (permalink)
Frank Junior Member Join Date: May 2002 Location: Philadelphia Posts: 19 Name: Franklin Bryant	It looks like you need to set your refine iterations (all objects) higher. 2 is always a good number. It may take a little longer for the solution to run. But I think it should fix your problem.

June 3rd, 2002	#8 (permalink)
samp Member Join Date: Nov 2001 Location: Ghent, Belgium Posts: 99 Name: Lode Blomme	I cannot use regathering since my VIZ4 hangs then on my old crappy PC Btw, the example image here is NOT mine! But I have he same problems. And usualy I take 3 for refine itirations, so that'll do

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