8
$\begingroup$

I have some problems understanding the motion blur shutter curve. I am near to the point to report a bug, actually ...

What I have done:

  • use any mesh or the default cube, animate it to move in any direction
  • go to the middle of the animation (the speed should be max there)
  • enable motion blur (cycles)
  • set the shutter curve to an extreme like from bottom left to top right

Now when you render the image, you will see ... well ... I can't tell from the image in which direction the cube is moving. Whatever I set the curve to, I can't tell the direction from a single image. Shouldn't that be obvious? Maybe I misunderstood that functionality.

This is an example of a moving cube with such a shutter curve in which direction does this cube move?

I can supply the blend file, if needed.

To clarify what I expected: I expected a (nearly) sharp cube with some trails to the side it is coming from.

$\endgroup$
  • $\begingroup$ Yeah, I think that's the way they always are...I've never seen it any differently. $\endgroup$ – JakeD Oct 26 '16 at 17:25
  • 2
    $\begingroup$ You have to adjust your expectations :-) Check any photo or movie still with motion blur, and you'll find that it looks exactly as the image you showed, with only one exception: when the camera is tracking the object. $\endgroup$ – Gez Oct 27 '16 at 1:26
  • $\begingroup$ In that case: What is the shutter curve actually used for? I was thinking it would allow you to set a somewhat focus on one frame while blending others a bit in. I am looking for something like this: vvvv.org/sites/default/files/imagecache/large/… $\endgroup$ – A. Tropics Oct 28 '16 at 20:00
  • 1
    $\begingroup$ I think the idea is you can create just what you want, or at least near to it... adaptivesamples.com/2015/11/16/cycles-custom-motion-blur-curves $\endgroup$ – tClancey Feb 27 '17 at 17:57
2
$\begingroup$

I experimented with the shutter curve and it actually works like you expected. I have a Picture here showing tests with different shutter curves:

enter image description here

The white diagramm shows the curve I used for that render. As Object I took the default cube and made it glowing white on black background. I think the main trick to achive the effect that you want is to increase the shutter time to at least 1 (I used 1 for my renders) but that depends on the speeds of your objects in your scene.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.