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Subject: Calling all poser animators....a challenging proposition

Jaqui opened this issue on Nov 20, 2002 · 10 posts
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Jaqui ( ) posted Wed, 20 November 2002 at 1:15 AM · edited Fri, 30 May 2025 at 3:47 PM

I was looking out the windows of elevated rapid transit yesterday, watching the rain run down the window. something struck me as odd... the water running down the window was travelling in the same direction as the transit vehicle, against the force of the wind and the direction that physics would suggest it should go from both friction, and gravity.

the vehicle is basically a rectangular cube.

anyone want to try to duplicate this oddity?
( btw, not one member in the big name animation software forums is willing to try to duplicate, they say way to much work at best )
I posted this in those forums, have goten reasons for the oddity, but no takers on making an animation of it.

wgreenlee1 ( ) posted Wed, 20 November 2002 at 6:29 AM

file_32325.jpg

How come you dont do it and show us all how.:)

Jaqui ( ) posted Wed, 20 November 2002 at 7:50 AM

sure, when my pentium-mmx suddenly gains the capabiliy of running even a flash animation I'll get right on it, but since it has a major meory leak ( mobo not ramchip like I first thought ) I can't use a single graphics app right now, even a gui locks me up after a short time.

wgreenlee1 ( ) posted Wed, 20 November 2002 at 10:08 AM

file_32326.jpg

Wow! Sorry to hear all that. I would die without my 'puter...

Jaqui ( ) posted Wed, 20 November 2002 at 10:11 AM

well it doesn't seem to stop linux from working properly, even in a gui, so maybe it's just windows. but it's not possible to use 3d apps under wine yet so can't use linux to work on it.

gryffnn ( ) posted Wed, 20 November 2002 at 10:42 AM

I'll take a guess that something about the train's shape (maybe an overhanging lip over the window or at the side & roof edge?) was channeling the air to produce a backdraft at the window. Did you notice the same thing on the first and last window of the car? A complicating factor might be chemicals on the window acting as surfactants. I've sometimes noticed counter-intuitive movements in things like snowflakes. Like any art, if you animate exactly what you see, it can end up looking unreal...

Jaqui ( ) posted Wed, 20 November 2002 at 11:03 AM

it was the vortex of the wind, created by the box shape pushing the air aside. it's not an aereodynamic design at all. if you have ever watched the exhaust of a jet during take off you have seen the swirl in it, that is the same thing as what caused this.

ockham ( ) posted Wed, 20 November 2002 at 1:45 PM

Attached Link: http://ockhamsbungalow.com/rain.mpg

This is a job for Python! See the linked MPG for a quick result. Shows only the effect of raindrops sliding down a window with a side-wind. I skipped transparency; that takes WAY too long to render for this demo purpose.

My python page
My ShareCG freebies

Jaqui ( ) posted Wed, 20 November 2002 at 6:55 PM

~chuckle~ ockham, looks good, though the transparency and a backround moving in same direction as the drops would help create the full impact.

bikermouse ( ) posted Sat, 23 November 2002 at 8:45 AM

Jaqui, I was going to say vortex, elactrostatic charge of the droplets, vibration of the 'transit' or the will of God. ockham, couldn't link for some reason. - TJ

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