crazy homeless guy

....if someone who knows about vray irradiance map settings could help me, i will give you my first born. well maybe not, but it would certainly be appreciated. i am working on an animation for a hospital. the deadline is quickly approaching. this is my first time using vray for animation, and i am having trouble setting the irradiance map parameters.

i have objects flickering in the animation. most noticable above the arms hanging from the ceiling in the surgery. there are 2 inch buttons there that hold the removable panels in place. i think they are 1/4" from the ceiling surface, and 1-2" in diameter. sometimes they are there, sometimes they are not.

here is a clip of the animation showing what i am talking about.

http://www.phase22.com/temp/surgery.wmv (windows media v7, 3.1 megs)

..and here are my irradiance map, and antialiasing parameters.



i am struggling with what each of the settings actually do. so far i have not found a good link describing what each one does.

thanks for any help.

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travis schmiesing

Chad Warner

It's been awhile so I am not sure about the settings, but I think you want to set your Clr thresh lower...looking at settings I used, I have Clr thresh set to .4, Nrm thresh set to .5 and Dist thresh set to .4. I know those settings were used specifically to stop flickering like that.

-Chad

IC

Nice modelling and lighting!
I know-no help whatsoever.

Chad Warner

Oh yeah....definitely nice modeling and lighting. How long per frame?

-Chad

Tim Nelson

I've had similar problems before, and its been my experience that the best way to fix that is to raise your min. rate on your antialiasing. Sometimes, to get everything to show up consistently, I had to raise the value to 0 or even 1. Probably not the answer you want to hear though.

Then again, I don't know a whole lot about the clr and norm. threshold values, so there may be a more efficient answer.

Maybe you can cheat a little bit and make those objects a little larger. That way they would be more likely to show up on each frame.

Have you tried searching the Chaotic forum? There are a lot of vray geniuses there, and I know the topic has been discussed before.

Beautiful clip so far though. The wall tile is awesome.

crazy homeless guy

thanks for the advice chad and timmatron. i will try these to see if they work. ..i will browse the vray forums also. i wish they would hurry up and put out a manual. at least this way people can not respond with 'RTFM'...


thanks for the compliments guys, i did the modeling in formz, and of course, the animation and rendering in max/vray.

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Christopher Nichols

Ok this is a completely blind suggestions since I am at work and I cannot view your file since I am using Linux. BUT it seesm that your AA settings are sorta bad which MAY contribute to bad flickering.

you have a Adaptive AA with -3 3. That seems very strange. I would suggest you use -1 3 or 0 3. having such a low min could make for really big AA sample which could look like a Irradiance sample flickering especially on large flat areas.

For high detail AA or anithing with detailed textures, I suggest using simple two level with 1 4

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--- OK... I did take a close look at your anim from my home computer and it is completely your AA settings. I'll bet you a dollar.

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Christopher P Nichols

crazy homeless guy

.....i tried the new settings, but i am still having problems.

http://www.phase22.com/temp/induction.wmv (windows media 9, 1.2 megs)

the irradiance map with the 0.4 control mesh didn't effect calculation time that much. i used AA settings of... 'adaptive subdivion -1 3'.

at the beggining i lose the foot to the chair a couple of times, the doors through the glass are dancing around, and my wood texture is fluttering.

i will try 'simple two level 1 4', and see if that helps.

the settings i did this clip with...

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travis schmiesing

muzzy

Hey Crazy,

I am digging the chaotic dimension forum to do animation with Vray last two weeks. Usually , people set the AA for fixed 4 or 5 with random checked or for Adaptive 0, 2 in animations.

Have you tried any of those options ?

crazy homeless guy

well, it is slowly coming around. i set AA to a fixed rate of 5, and it calmed most of the stuff down. i still have some jumping in a few spots, but not nearly as bad as it was.

...i seem to be having texture trouble alos. max's default chrome/stainless steel using the lake image map does not seem to work well in animation, at least animation with vray.

http://www.phase22.com/temp/surgery_2.wmv (windows media 9, 3.1 megs)

thanks for the help.

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travis schmiesing