Sonic Ether

2nd February 2006 00:22 UTC

What about motion blur?
I think that a motion blur could make things look great. The only thing is that I couldn't really imagine how it would be done but here are my ideas.

A motion blur is a combination of two frames. So, if one frame was:

0

and the next frame was

0

then the result would be a blur between the two zeros

0-0

Sorry for the crappy dash, but that's my motion blur.



So, would this be somthing you would put into a superscope that you wish to motion blur by changing the colors based on the behaviour of the scope? Or would it be possible in a Dynamic Movement? I'm guessing that it would requre somthing like AVS takes like a variable of an image and somehow blurs it with the frame after the taken image. Does anyone have ideas?

gaekwad2

2nd February 2006 01:17 UTC

To get good motion blur by blending frames you need extremely high framerates, otherwise you'll only get ghosting.

Sonic Ether

2nd February 2006 05:18 UTC

How could you blend frames like that though? There's got to be a simple way to do it, or at least fake it.

StevenRoy

2nd February 2006 08:17 UTC

This sounds a lot like something I've done a few times, by creating an empty Effect List with the input mode set to "50/50" and the output mode set to "Replace". This creates a blending effect much like what you seem to be describing.

Of course, you can do the same thing with the input mode set to "Adjustable"; it'll probably be slightly slower, but you can control the strength of the effect.

JaVS_v2.5

2nd February 2006 09:39 UTC

Blur made something looks great.. :up:

Tuggummi

2nd February 2006 11:37 UTC

I've done it a couple of times, with multiple dynamic movements. Though they were radial zoom blurs, but the same method could be adjusted for motion blur.

It's a really slow method though.

Examples from two of my packs in the zip.

eheiney

2nd February 2006 19:38 UTC

Oooh, Faster than light! I still love that preset, it's so simple but the result is fantastic. :D:up:

Sonic Ether

2nd February 2006 22:37 UTC

Originally posted by StevenRoy
This sounds a lot like something I've done a few times, by creating an empty Effect List with the input mode set to "50/50" and the output mode set to "Replace". This creates a blending effect much like what you seem to be describing.

Of course, you can do the same thing with the input mode set to "Adjustable"; it'll probably be slightly slower, but you can control the strength of the effect.

Tuggummi

3rd February 2006 10:15 UTC

Hmm, then i have a completly different concept of what "motion blur" is :eek:

I was thinking the motion blur effect of image manipulators, ie. photoshop. Couldn't even imagine you wanted something as simple as a 50/replace effect list :p

StevenRoy

3rd February 2006 10:25 UTC

Yeah, there's a "directional" motion blur (like Photoshop has), and then there's a "temporal" motion blur. It's easy to confuse the two, especially since "motion blur" usually refers to the former.

In fact, I'm not sure "blur" is even accurate in this case; "blend" might be a better word. "Motion blend".

Tuggummi

3rd February 2006 10:34 UTC

Tell that to the developers.
Damn them and their false terms!

hornet777

3rd February 2006 13:58 UTC

LOL, Tugg: the inconsistent nomenclature is spread throughout DSP; its a mess trying to communicate it....

jheriko

3rd February 2006 14:49 UTC

How about 'physically correct' motion blur? Its prolly the easiest since they give you a fadeout to start with... which is mostly what motion blur is :)

Now using the effect list with the 50/50 blend trick just does a special type of fadeout

new=.5*old

i.e. it halfs brightness each frame.

A cheaper and fps independent way to do this is with a color modifier:

init:
lasttime=gettime(0);

frame:
dt=gettime(lasttime);lasttime=gettime(0);
opt = pow(.5,30*dt);

level:
red=red*opt;green=green*opt;blue=blue*opt;

This gives a reasonably accurate approximation to the fadeout acheived by halving the color 30 times a second (like the effect list trick would work running at 30fps).

gaekwad2

3rd February 2006 15:32 UTC

But real motion blur doesn't fade out, you'd have to average framerate/simulated_shutter_speed frames.

jheriko

3rd February 2006 15:42 UTC

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