Psychological motion blur?

[Micha]

Hi,

I ask me, could it be possible to implement a motion blur not like seen from a camera, more like seen/feeled by a human? What I mean is, that the object in motion is sharp visible but with a wisp/smear behind. I got the idea for that some months befor, as I read a cartoon painting book - motion lines can be seen behind moving objects. This kind of blur could be great for product viz, there an object should be clear visible but with the "feeling" of motion.

I tried to get the effect by photoshop, but it's very difficult and don't got what I want. The motion smear dosn't follow the motion allways. Maybe it can be rendered. Could be a nice new feature. Vray could be the first engine for it. Better than shooting an image per camera.

Attached some imperfect postwork tests. The black point test show a first smear test and the standard motion blur. Also the smear effect helps to see the direction of motion.

Ciao,
Micha

[vlado]

You can use the Bias parameter for the motion blur to make it stronger at one end of the motion blur interval.

Best regards,
Vlado

[Micha]

Thank you Vlado, I'm curious to test it. I hope motion blur will be implemented in Vray for Rhino 2.

[simmsimaging]

I don't think you can get this effect with the physical camera though. I started a thread about this question not long ago but I don't think there was a firm answer. For now you have to use a max camera to do it.

b

[vlado]

Yep, the physical camera was coded after an actual photographic camera. For such effects using a generic camera would be a better idea.

Best regards,
Vlado

[RE:FORM_STUDIOS]

you could always use long exposure and animate the lighting (ie flash) as you would in real life to get motionblur trails whilst retaining sharpness of the subject. I can't remember the correct term for this used in photography though!

[simmsimaging]

Shutter drag is the term I'm familiar with. You get different effects with rear and front curtain shutters.

b

[glorybound]

Bias parameter

Can someone explain the Bias parameter?

[simmsimaging]

Bias of zero spreads the motion blur evenly to either side of the object (imagine it samples 1 frame before you selected one, the selected one, and 1 frame after). Raising or lowering the bias is kind of like pushing the sampling to more frames before or more frames after. The visual effect is that the blur streaks more behind an object, or more in front of it. If you change it at all going into a negative bias (moving the blur behind the object) is probably the more common one you would need.

b

[glorybound]

Blur

Is this the center bias setting under Bokeh Effects?

[simmsimaging]

no, it's in the motion blur section of the camera rollout in the render dialog. It's not available on the physical camera settings.

[glorybound]

Blur

I see it... the camera type parameter. I have never ventured in there before.