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jonathanball (pokedstudio)
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Wed, Feb 12, 3:37 PM (1 w, 2 d)

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Fri, Feb 14

jonathanball (pokedstudio) added a comment to T73756: Animating influence of 'Child Of' bone constraint causing motion blur errors..

thanks for re-looking at this guys!

Fri, Feb 14, 8:27 PM · Cycles, BF Blender

Thu, Feb 13

jonathanball (pokedstudio) added a comment to T73758: Cycles - Inconsistent Motion blur based on interpolation mode.

in the screen shot both child bones have the same movement in relation to the camera. Also the parent bones move the same amount in relation to the camera but the parents have different interpolation , this ends up create two different motion blur results on the object parented to the child. Multiply that effect on a rig with numerous parents and the results are all over the place.

Thu, Feb 13, 2:42 PM · BF Blender
jonathanball (pokedstudio) added a comment to T73758: Cycles - Inconsistent Motion blur based on interpolation mode.
Thu, Feb 13, 2:38 PM · BF Blender
jonathanball (pokedstudio) added a comment to T73756: Animating influence of 'Child Of' bone constraint causing motion blur errors..
Thu, Feb 13, 9:27 AM · Cycles, BF Blender
jonathanball (pokedstudio) added a comment to T73758: Cycles - Inconsistent Motion blur based on interpolation mode.

If you have a parent bone with bezier interpolation between sequential keyframes moving a child bone with bezier interpolation between sequential keyframes, you get one result.
If you have a parent bone with constant interpolation between sequential keyframes moving a child bone with bezier interpolation between sequential keyframes, you get a different and impossible result.
This holds even if the visual distance travelled by the child bone is exactly the same in each test. There is no good reason for the interpolation of the parent bone to be taken into account in any blur calculations when the child is key-framed and animated and has its own keyframe interpolation.

Thu, Feb 13, 9:04 AM · BF Blender
jonathanball (pokedstudio) added a comment to T73758: Cycles - Inconsistent Motion blur based on interpolation mode.

The cubes are travelling the same distance. This is the whole reason the the concern has been raised

Thu, Feb 13, 8:57 AM · BF Blender

Wed, Feb 12

jonathanball (pokedstudio) added a comment to T73758: Cycles - Inconsistent Motion blur based on interpolation mode.

My understanding is that the keyframe interpolation of the parent bone is being taking into account rather than just that of the child bone. This leads to issues with motion blur when rendering rigged characters with varying keyframe interpolations on different bones. We have noted extra long render times, and odd looking motion blur when this happens.

Wed, Feb 12, 3:42 PM · BF Blender