Subject:
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Re: clockwork pov animation
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 7 Feb 2002 00:27:36 GMT
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Viewed:
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748 times
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Chris Daniel wrote...
> I have uploaded an executable zip file of my clockwork animation.
> Ahui pointed out to me that my last upload was broken so This time I used
> mpg format. http://www.brickshelf.com/cgi-bin/gallery.cgi?f=11382
Very nice animation!
> The most chalanging process with this animation was trying to figure out
> what direction each part would turn in my output.
>
> For example
>
> //this gear turns counter clockwise or left as I expected
> object {
> _3649_dot_dat
> rotate<0,0,clock*360>
> matrix <1-SW/105.98,0,0,0,1-SW/105.98,0,0,0,1-SW/20,0,0,0>
> matrix <-0.987688,0.156434,0,0.156434,0.987688,0,0,0,-1,-50,0,0>
> #if (version >= 3.1) material #else texture #end { Color1 }
> }
> //this gear turns clockwise the opposit of what I expected
> object {
> _3649_dot_dat
> rotate<0,0,clock*360>
> matrix <1-SW/105.98,0,0,0,1-SW/105.98,0,0,0,1-SW/20,0,0,0>
> matrix <0.996917,0.0784591,0,-0.0784591,0.996917,0,0,0,1,50,0,0>
> #if (version >= 3.1) material #else texture #end { Color26 }
> }
The two gear wheels rotate the same way in their own world,
but then you have rotated one of the wheels 180 degrees around
the y-axis, so the result is that they rotate in opposite directions
in your scene. Isn't that what you expected ;-)
See http://news.lugnet.com/cad/?n=7168
> If anyone can enlignten me on the matrix and how it effects x,y,z rotations
> It would save me allot of time in the future.
L3P simply converts
1 26 x y z a b c d e f g h i 3649.dat
into
object {
_3649_dot_dat
matrix <seam-transformation>
matrix <a,d,g,b,e,h,c,f,i,x,y,z>
#if (version >= 3.1) material #else texture #end { Color26 }
}
So, the matrix simply moves the gear wheel into place just like MLCad (et al) does.
POV applies transformations in the order they appear,
so you can add a rotate before the matrix to rotate the wheel in its own world
before it is put in the proper place in your scene by matrix.
The seam-transformation shrinks the wheel a bit. If it were a brick adjecent to
another brick, they would thus have a small seam between them.
/Lars
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Message is in Reply To:
 | | clockwork pov animation
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| I have uploaded an executable zip file of my clockwork animation. Ahui pointed out to me that my last upload was broken so This time I used mpg format. (URL) most chalanging process with this animation was trying to figure out what direction each (...) (23 years ago, 4-Feb-02, to lugnet.cad)
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