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Author Topic: speedy effect  (Read 1731 times)

harsha

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speedy effect
« on: June 16, 2010, 10:36:27 am »

hey guys! have u noticed that sometimes when some objects move fast, they seem to be a blur and leave a trail behind? Or when a fan is spinning, it is hard to spot the fast moving blades. In anim8or, if u rotate an object, it will show a solid object at each frame in different orientations. How do u make it look real then? Don't look at me... I have no idea. I'm just starting this forum so that some genius out there would have already found a way. hope u r that genius. awaiting ur answer...
harsha
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ENSONIQ5

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Re: speedy effect
« Reply #1 on: June 16, 2010, 11:13:43 am »

What you are talking about is motion blurring.  Some higher-end animation packages can simulate this by calculating additional "tweeners" (frames in-between rendered frames) and rendering them in the same frame, so essentially each frame has 3 or more overlaid images.  It still isn't a really accurate simulation since motion blurring in reality is an analogue thing, and of course rendering takes much longer, but it works reasonably well, and it can be manually simulated using Anim8or and an external 2D editor, and a lot of patience.
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dwsel

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Re: speedy effect
« Reply #2 on: June 16, 2010, 11:54:23 am »

If you want this effect in animation I'd recommend to render whole thing with fps twice or trice as much as in target animation (i.e. your target is 25fps so you create animation with 50fps). Then you take the thing into VirtualDub http://www.virtualdub.org/ apply motion blur filter and you output the file with 25fps. That's what I did in my latest animation when I wanted to avoid strobing effect (blinking) on rapidly spinning object.
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hihosilver

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Re: speedy effect
« Reply #3 on: June 17, 2010, 01:50:07 am »

Another way to do this is through texturing.  for example, for your spinning fan you create a texture (and transparency map) that mimicks what a frame of the fan looks like with the motion blur on it.  You can then spin that object and get something a bit more realistic (though it wont have depth.)
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headwax

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Re: speedy effect
« Reply #4 on: June 17, 2010, 06:08:04 am »

intosh#[/youtube]p/u/63/wlcUcwb92rA

there' some props on these airoplanes

they are spinning planes with a transmap and texture map applied as hiho said, also some specular using the transmap value

to make, in photoshop draw a white cross on a black background

hit it with radial blur to distort it slightly, this is your transmap and texture map unless you want to addd a bit of color to the texture

for script on how to get a good spin see ensoniqu - he the man
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ENSONIQ5

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Re: speedy effect
« Reply #5 on: June 17, 2010, 07:31:29 am »

Rotation script (apply to the Orientation bit):

float $speed;
$speed=2;
$orientation = (0,0,sin($speed*time),cos($speed*time));

The $speed variable controls the speed of rotation, higher number = faster rotation.  To change the rotation axis, shift the position of the zeros in the last line, as follows:

$orientation = (0,sin($speed*time),0,cos($speed*time));

or

$orientation = (sin($speed*time),0,0,cos($speed*time));

IMPORTANT: Credit where it's due, this script was originally nicked from Kreator's "Windmill" tutorial!
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