Problem with Irradiance map multiframe incremental urgent pls help....

yogeshwagh · December 27th, 2006

hi to all,
i have stucked with one problem with irradiance map calculations with multiframe incremental . I m working on the loopable animations so in my animations my 1st and last frame should be same.
when i m rendering my 1st and last frames without saving irradiance and lightcache both are coming same. but when i m saving my lightcache and irradiance maps with multiframe incremental and giving the path for both then it is giving me shadow jitters and lighting jitters.
i don't know why its happening ,..... i request you to all pls help me out in this

thanks in advance

Yogesh

Brian Smith · December 27th, 2006

your description is a little confusing...are you network rendering?

Use 'Incremental Add to Current Map' for IR map and 'Fly-through' for LC and you shouldn't have any problems.

yogeshwagh · December 27th, 2006

Quote:

Originally Posted by Brian Smith

your description is a little confusing...are you network rendering?

Use 'Incremental Add to Current Map' for IR map and 'Fly-through' for LC and you shouldn't have any problems.

thanks brian
i will try this. i will describe u in brief,... see i am working on the loopable animations. so i have to match my lighting and all objects in my scene with the last frame means my 1st and last frame should be same no flickers in lighting or in shadows.
in my project i m moving a light source with my camera to match the lighting of 1st frame and last frame. so if i render with single frame irradiance map and single frame for lc then both the frames are totally matched.
but the problem comes when i am saving my lc with flythru and irradiance with multiframe incremental. if i render my 0th and last frame with these two lc and irradiance map saved for whole animation it won't match its giving flickers in shadows.

thanks
Yogesh

Tim Nelson · December 27th, 2006

Are you using Vray lights? If you do, you could use the "store with irradience map" option. I 'think' that would help the problem, but not totally sure.

Rick Eloy · December 28th, 2006

If I understood this correctly, your light is moving? If so, you should use single frame for LC and IrrMap.

Brian Smith · December 28th, 2006

Maybe it's just me but i still don't understand the justification for animating the lights. There's no reason why you can remove flickering GI without animating the lights. You can look at an example of a 'flickerless' (?) animation setup on the insider article 'Creating Vegetation on a Large Scale - Part 2 of 2'...in the scene file we created a looping animation (that I think is what you're trying to do) and there's no flickering GI.

I like that word, flickerless! I think i'll use it more

yogeshwagh · December 29th, 2006

Quote:

Originally Posted by Brian Smith

Maybe it's just me but i still don't understand the justification for animating the lights. There's no reason why you can remove flickering GI without animating the lights. You can look at an example of a 'flickerless' (?) animation setup on the insider article 'Creating Vegetation on a Large Scale - Part 2 of 2'...in the scene file we created a looping animation (that I think is what you're trying to do) and there's no flickering GI.

I like that word, flickerless! I think i'll use it more

hi brian thanks for reply,
where is that article ,.. can u pls send the link

yogeshwagh · December 29th, 2006

Quote:

Originally Posted by Rick Eloy

If I understood this correctly, your light is moving? If so, you should use single frame for LC and IrrMap.

hi rick thanks for your reply....
i have already rendered with single frame for both lc and irr map but it gives me so many flickers in shadows. i will upload my 0th and 900th frame just see it. then only u can find my problem
please go through the attachements and give me the solution

Christopher Nichols · December 29th, 2006

You can only bake lighting (use saved IR and LC maps) if ONLY your camera is moving. If your lights or geometry changes... even if your shaders change, you will have yo do through it brute force. You sort of have no choice there. In order to make it "flickerless" you will have to use high settings. A good "universal" setting can be found here:

http://www.chaosgroup.com/forum/phpB...ic.php?t=14747

However, I have found that you can get away with somewhat lower AA settings, in 95% of the cases. 1/25 and 0.002 or so should be good, and keep your render times more reasonable.

Rick Eloy · December 29th, 2006

Well, Yogesh, there is a tiny difference between the two frames. It's tiny, but noticeable. Can you post your settings? From my experience, this kind of thing happens with low settings, either for LC or IrrMap. One thing that occured to me is that you are probably using the LC scale set to screen, which is likely to cause that effect in animations. If so, change it to world and render these 2 frames again to see what happens.

December 27th, 2006	#1 (permalink)
yogeshwagh Senior Member Join Date: Dec 2005 Location: India Posts: 109 Name: yogesh wagh	Problem with Irradiance map multiframe incremental urgent pls help.... hi to all, i have stucked with one problem with irradiance map calculations with multiframe incremental . I m working on the loopable animations so in my animations my 1st and last frame should be same. when i m rendering my 1st and last frames without saving irradiance and lightcache both are coming same. but when i m saving my lightcache and irradiance maps with multiframe incremental and giving the path for both then it is giving me shadow jitters and lighting jitters. i don't know why its happening ,..... i request you to all pls help me out in this thanks in advance Yogesh

December 27th, 2006	#2 (permalink)
Brian Smith Veteran Member Join Date: Mar 2005 Location: Sarasota, FL Age: 36 Posts: 1,058 Name: Brian Smith	Re: Problem with Irradiance map multiframe incremental urgent pls help.... your description is a little confusing...are you network rendering? Use 'Incremental Add to Current Map' for IR map and 'Fly-through' for LC and you shouldn't have any problems. __________________ Brian Smith www.3dats.com 3D Architectural Training Solutions

December 27th, 2006	#4 (permalink)
Tim Nelson Veteran Member Join Date: May 2003 Location: Providence, RI Age: 30 Posts: 1,612 Name: Tim Nelson	Re: Problem with Irradiance map multiframe incremental urgent pls help.... Are you using Vray lights? If you do, you could use the "store with irradience map" option. I 'think' that would help the problem, but not totally sure. __________________ Tim Nelson timnelson3d.com

December 28th, 2006	#5 (permalink)
Rick Eloy Moderator Join Date: Apr 2002 Location: São Paulo, Brasil Age: 31 Posts: 2,386 Name: Ricardo Eloy	Re: Problem with Irradiance map multiframe incremental urgent pls help.... If I understood this correctly, your light is moving? If so, you should use single frame for LC and IrrMap. __________________ Rick Eloy reb digital - Really, I'm doing it for the kids...

December 28th, 2006	#6 (permalink)
Brian Smith Veteran Member Join Date: Mar 2005 Location: Sarasota, FL Age: 36 Posts: 1,058 Name: Brian Smith	Re: Problem with Irradiance map multiframe incremental urgent pls help.... Maybe it's just me but i still don't understand the justification for animating the lights. There's no reason why you can remove flickering GI without animating the lights. You can look at an example of a 'flickerless' (?) animation setup on the insider article 'Creating Vegetation on a Large Scale - Part 2 of 2'...in the scene file we created a looping animation (that I think is what you're trying to do) and there's no flickering GI. I like that word, flickerless! I think i'll use it more __________________ Brian Smith www.3dats.com 3D Architectural Training Solutions

December 29th, 2006	#9 (permalink)
Christopher Nichols Moderator Join Date: Apr 2002 Location: Lalaland Posts: 1,166 Name: Christopher Nichols	Re: Problem with Irradiance map multiframe incremental urgent pls help.... You can only bake lighting (use saved IR and LC maps) if ONLY your camera is moving. If your lights or geometry changes... even if your shaders change, you will have yo do through it brute force. You sort of have no choice there. In order to make it "flickerless" you will have to use high settings. A good "universal" setting can be found here: http://www.chaosgroup.com/forum/phpB...ic.php?t=14747 However, I have found that you can get away with somewhat lower AA settings, in 95% of the cases. 1/25 and 0.002 or so should be good, and keep your render times more reasonable. __________________ Christopher P Nichols

December 29th, 2006	#10 (permalink)
Rick Eloy Moderator Join Date: Apr 2002 Location: São Paulo, Brasil Age: 31 Posts: 2,386 Name: Ricardo Eloy	Re: Problem with Irradiance map multiframe incremental urgent pls help.... Well, Yogesh, there is a tiny difference between the two frames. It's tiny, but noticeable. Can you post your settings? From my experience, this kind of thing happens with low settings, either for LC or IrrMap. One thing that occured to me is that you are probably using the LC scale set to screen, which is likely to cause that effect in animations. If so, change it to world and render these 2 frames again to see what happens. __________________ Rick Eloy reb digital - Really, I'm doing it for the kids...

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