Fume - Animated object is behind fire sim

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Old 07 July 2009   #1
Fume - Animated object is behind fire sim

I have a simple animation with an object animating from point a to point b. It moves kind of quickly but I'm having an issue where the fire is actually simulating in front of the object. It looks like it might be about a single frame distance.

Does anyone know why this is happening? And is there anything I can do to stop it from happening?

cheers
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Gene Crucean
Arnold Renderer
 
Old 07 July 2009   #2
Example attached
Attached Images
File Type: jpg teapotDistance_02.jpg (32.1 KB, 73 views)
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Last edited by visualboo : 07 July 2009 at 05:32 PM.
 
Old 07 July 2009   #3
Wow that is odd!

What are your Simulation Steps set to?

Nice Flames
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Old 07 July 2009   #4
Ah only 1. I'll play with that setting a bit. Thanks for the input.
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Gene Crucean
Arnold Renderer
 
Old 07 July 2009   #5
The help docs make that setting seem like it would fix this but no such luck.
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Gene Crucean
Arnold Renderer
 
Old 07 July 2009   #6
Yes, typically fast moving objects need more Sim Steps for better accuracy.

You don't happen to have a hidden teapot that is in the object source by any chance, do you?

And

How fast is that Teapot moving? How many frames until it completes the circle?
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Old 07 July 2009   #7
Your object emitter velocity might also be coming into play here , since it's moving forward, it might be adding forward momentum to the actual smoke.
 
Old 08 August 2009   #8
Yeah, Fuentealba is right. In your source, in the velocities parameters, you have 'object's' - reduce that
 
Old 08 August 2009   #9
Thanks for the replies guys. Sorry I'm an XSI guy using fume for the first time

I have velocity set to 0. Though it didn't seem to have any effect. I also upped the simulation steps to 5 with no effect.

I attached the scene if anyone is willing to check it out.

cheers
Attached Files
File Type: zip SpeedObjectTester_v002.zip (51.7 KB, 8 views)
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Gene Crucean
Arnold Renderer
 
Old 08 August 2009   #10
Originally Posted by visualboo: Thanks for the replies guys. Sorry I'm an XSI guy using fume for the first time

I have velocity set to 0. Though it didn't seem to have any effect. I also upped the simulation steps to 5 with no effect.

I attached the scene if anyone is willing to check it out.

cheers


Are you running Max 2010? I'm trying to open your scene in 2009 but not being able to.
 
Old 08 August 2009   #11
Ah yes sorry. 2010
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Gene Crucean
Arnold Renderer
 
Old 08 August 2009   #12
Well first, be kind, post a sample scene with local/no paths waiting a dogs age for my machine to figure out that they don't exist on our network...

Uh umm... your teapot... or should I say Fume is working as it should, it is your teapot that needs to layoff the Starbucks Triple Espresso's

I slowed your teapot down from 24 frames (one time around the path) to 200 frames, the issue is now apparent.




You just happen to be rendering a frame when the teapot is coming back instead of it apex forward. Or it happens that it is so quick that it will always render the teapot on the trail end of the inner loop.
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Last edited by JohnnyRandom : 08 August 2009 at 09:53 PM.
 
Old 08 August 2009   #13
Sorry about the paths. And thanks for taking the time to look at this.

Nice find btw. Looking at the keys, the interpolation was getting set to bezier which made the tangents fail.

Before:
http://www.genecrucean.com/misc/spe...ster_Before.jpg

After a quick scale:
http://www.genecrucean.com/misc/spe...ester_After.jpg

Even after setting the keys to linear interpolation and cranking a few settings, it still seems to have this effect. Is there a known object speed limitation with Fume?
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Gene Crucean
Arnold Renderer
 
Old 08 August 2009   #14
I recreated your scene albeit for the spiral (not sure how you acquired its motion), and I cannot seem to replicate the issue.

My guess is something buggy in the scene file.

Below this is at 3 sim step and it is noticable by the stepping close to the teapot but anyway...

Attached Files
File Type: zip Max2010_FumeObjectSpeedTest_002.zip (20.7 KB, 3 views)
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Last edited by JohnnyRandom : 08 August 2009 at 09:42 PM.
 
Old 08 August 2009   #15
Odd. Thanks for taking the time to play with this a little. I'm still experimenting.
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