Author Topic: heavy motion blur  (Read 1317 times)

2018-08-17, 14:59:53

Naxos

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Hello there,
I need to animate something like in this video : https://www.youtube.com/watch?v=htbQf6hwhis&feature=youtu.be

So i've animated a rotation object, 2 turns in 25 frames, so very fast rotations, then i've set the motion blur for the camera for geometries.
Then i've set the shutter speed to low 5.0, and raised up the Mblur Transform segments to 100 (in render params).

I'm quite happy with the result, but it looks a bit too much as a slow flash photo (don't know the terms in english), so the geometry is blurred but the main silhouette is still visible / guessable...

Any idea ?

2018-08-17, 15:36:26
Reply #1

romullus

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Did you animate rotation of the object linearly? By default 3ds max uses slow in/out tangents for new animation keys, so your object won't rotate at equal speed through entire animation and that might produce non uniform motion blur. Not sure if that's your case.
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2018-08-17, 15:40:52
Reply #2

Naxos

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Did you animate rotation of the object linearly? By default 3ds max uses slow in/out tangents for new animation keys, so your object won't rotate at equal speed through entire animation and that might produce non uniform motion blur. Not sure if that's your case.

The anim is constant in velocity.

2018-08-17, 18:42:37
Reply #3

pokoy

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That's probably because it reflects more light (appears brighter) at certain angles, these stand out against angles with less light visible to the viewer. Adding a few more lights would probably help.

What concerns me is that the blur isn't uniform, which shouldn't happen when the light intensity is constant. What happens if you make the animation slower and extend the mblur duration (1/2 x anim, 2 x mblur duration etc.), does it change the outcome does it look the same?

2018-08-19, 00:40:08
Reply #4

Naxos

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The shader is glossy, so you are probably right.

Anyway, the customer loved it as it is, so no need to change further.

Thanks for help.