Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Spinning Wheels
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Fri, 21 Sep 2001 09:13:25 GMT
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Viewed:
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1881 times
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In my work for animation, I need a standard for wheels location and
rotation.
I also want information on radius for each assembly (1 wheel + 1 tyre)
to be able to calculate rotation angle based on the movement of parent
vehicle object.
As a car has a front, it would be natural if front view means to look at
the front, and wheels are either not rotated along the y axis or rotated
180 deg's. Is it ok if I make shortcuts of 1 wheel + 1 tyre with this
one standard and add "0 RADIUS r" information in each shortcut?
I have made the following shortcuts:
0 Wheel Spoked Large with Tyre Black
0 RADIUS 53
1 16 10 0 0 0 0 -1 0 1 0 1 0 0 35.dat
1 0 12 0 0 0 0 -1 0 1 0 1 0 0 36.dat
0 Wheel Old with 12 Studs and Tyre
0 RADIUS 53
1 4 10 0 0 0 0 -1 0 1 0 1 0 0 715.dat
1 16 12 0 0 0 0 -1 0 1 0 1 0 0 36.dat
0 Wheel Old with 4 Studs and Smooth Tyre
0 RADIUS 30
1 4 10 0 0 0 0 -1 0 1 0 1 0 0 7039.dat
1 16 12 0 0 1 0 0 0 1 0 0 0 1 132-old.dat
0 Wheel Old with 4 Studs and Tyre Black
0 RADIUS 31
1 16 10 0 0 0 0 -1 0 1 0 1 0 0 7039.dat
1 0 12 0 0 0 0 -1 0 1 0 1 0 0 3483.dat
0 Wheel Centre Small with Tyre Black
0 RADIUS 18
1 16 8 0 0 0 0 -1 0 1 0 1 0 0 4624.dat
1 0 8 0 0 0 0 -1 0 1 0 1 0 0 3641.dat
2 1 0 -80 0 0 80 0
2 2 -40 0 0 40 0 0
If the movement of parent vehicle object relative to its parent [scene]
object is z LDU, the wheel rotation matrix should be:
1 0 0 0 cos(z/r) sin(z/r) 0 sin(z/r)*(-1) cos(z/r)
times its own rotation matrix relative to its parent (vehicle again)
object.
(r is radius of wheel, and angles are in radians)
Is that correct in all cases?
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