Bake camera in world coordinates

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Old 08 August 2013   #1
Bake camera in world coordinates

I want to bake my camera in world coordinates. But when i do this I get some strange peaks on my graph.
It seems to me that camera flips over 360 degrees.


My scene here:
https://docs.google.com/file/d/0B9e...WdqQ0I3MzQ/edit
 
Old 08 August 2013   #2
Does Curves->Euler Filter help at all?
 
Old 08 August 2013   #3
Originally Posted by Tobbe: Does Curves->Euler Filter help at all?

It didn't help me.
 
Old 08 August 2013   #4
How did you go about baking to world coordinates?

It seems strange that you would get different results.

Is your camera in a group that is also being keyed?

Try duplicating the camera. Unparent it. Then constrain the duplicate to the animated one. The duplicated camera will now have world coordinates. Bake to keys.

Rich
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Old 08 August 2013   #5
I just looked at your scene.

Here is a baked version.

https://www.dropbox.com/s/pmw0yot19...am_02_baked.zip

I noticed that you had scaled your cameras. You should avoid doing as it can cause issues when rendering with raytracers. Use the Locator Scale in the Display settings of the camera.

Let me know if this works right for you.

Rich
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Old 08 August 2013   #6
I've downloaded your scene.
And your baked camera has the same problem as mine
 
Old 08 August 2013   #7
Hmm, comparing the baked camera in chuckie's scene with the original camera, I can't see a difference in motion... so it seems the bake is correct after all?!
 
Old 08 August 2013   #8
The motion of this cameras are the same.
But you can't use motion blur with this "world baked camera", because it has this peaks and motion blur would be crazy in these places.
And also I can't use this camera in Nuke for compositing with motion blur.

Last edited by abramovcg : 08 August 2013 at 07:48 AM.
 
Old 08 August 2013   #9
Really? But I can't see a 360 flip or something... the peaks are really tiny.
 
Old 08 August 2013   #10
Originally Posted by Tobbe: Really? But I can't see a 360 flip or something... the peaks are really tiny.

I did some tests with motion blur and actually there no any crazy stuff. All looks ok
I'm really surprised
 
Old 08 August 2013   #11
My approach to solve something like this if the spikes aren't too noticeable would just be to cut out those bad keys and just smooth out the curve in spline (buffer curves can be handy for keeping track of what the original looked like while doing that), similar I guess to cleaning mocap.

Cheers,
Brian
 
Old 08 August 2013   #12
you can do an euler filter on this spikes, but you have to select them all dots first in the anim window.
then you have all spikes removed.
 
Old 08 August 2013   #13
Originally Posted by Sorath: you can do an euler filter on this spikes, but you have to select them all dots first in the anim window.
then you have all spikes removed.


Nope! Since this is not 360 flips or any euler related spikes, it does not help. The spikes are actually part of the original motion. Only "solution" is to do what Horganovski suggests - edit and smooth the curves.
 
Old 08 August 2013   #14
well I don't understand, if you do a bumpy camera move like this it is expected that you have some weird motionblur, then just smaller the shutterangle or no motionblur.
 
Old 08 August 2013   #15
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