Subject:
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Re: A small (and my first) train animation done with MLCad
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Newsgroups:
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lugnet.trains
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Date:
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Tue, 5 Sep 2006 21:16:05 GMT
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Viewed:
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3722 times
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In lugnet.trains, Timothy Gould wrote:
> In lugnet.cad, Reinhard "Ben" Beneke wrote:
> > http://festum.de/1000steine/album/Brickfilme_by_ben/Film_Ben_001.wmv
>
> Hi Ben,
>
> Very neat and I imagine from my past povray animation experiments that it was
> very time consuming.
>
> The one problem I have with it is the sky. It distracts from the train in the
> first few seconds of the animation. Perhaps a smoother transition from floor to
> sky would improve that.
>
> Other than that one complaint though I have to say it's a great animation.
> Really looks like the train is running.
>
> Tim
Dear Tim,
take this as not more than a first test run.... I did several runs so far in
which I was playing around with anti alias (the POV-Ray manual tell NOT to use
it, while I found it looked way better with AA-settings).
I also tested coloured floors as well as transparent ones (with alpha channel
activated).
I tried several light settings and all that was really time consuming.
Getting the standard BR23 Pov-file into an improved one with lots of sin(clock)
and cos(clock) values was quite easy. I needed less than 5 hours from my first
test run to my finished pov file. My main mistakes were dealing with rearwards
rotation and the 90° phase shift of the connecting rods between left and right
side of the engine (actually this is set properly like in the real engine - even
the wheels in the tender are rotating and I even misaligned them smoothly for
some wobbling - still it remained invisible.).
The most complicated part in the whole moving is the piston rod. That one moves
with the driver wheels on the eye side while it is always leading through a
second point in the cylinder block. I had to calculate the differing angle of
the rod depending on the wheel angle.
Making the wheels spin in different speeds and make the thing move with correct
speed on the track is utterly easy: the Pov Ray help shows a ball running on a
surface as a rendering example: that tells you 99% of the code.
Leg Godt!
Ben
P.s.: the rendering takes of course some time: each single picture renders
between 2 minutes and 6 minutes 8depending on the angle and distance to the
"camera").
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