Subject:
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matrix calculation at part inlining
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 12 Dec 2007 21:46:30 GMT
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Viewed:
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2535 times
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Please I need help.
How to inline line type 2,3,4 and 5 is explained in the current
specification of the LDraw File Format like:
Formally, the transformed point (u', v', w') can be calculated from
point (u, v, w) as follows:
u' = a*u + b*v + c*w + x
v' = d*u + e*v + f*w + y
w' = g*u + h*v + i*w + z
But I do not know how to calculate line type 1 values.
The results that I get are near by correct, but not really.
I use the calculation like above for the x,y,z values, that works.
I use the calculation like above also for the matrix values except the
last addition of x,y,z.
The absolute values are correct that I get, but some values should be
minus where I calculated plus or plus where I calculated minus.
I think the problem is because of the coordinate system used, but I
found no solution.
Any help is welcome
cu
mikeheide
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Message has 1 Reply:
 | | Re: matrix calculation at part inlining
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| (...) Put a-i and xyz into matrix form for the parent and child type 1 lines, then multiply the two matrices together, then extract a-i and xyz from the resulting matrix. The matrices will look like either of the following: / a d g 0 \ / a b c x \ | (...) (17 years ago, 12-Dec-07, to lugnet.cad)
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