Subject:
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Re: Math Help Needed PLEASE
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 19 Jun 2000 10:08:42 GMT
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Viewed:
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566 times
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In lugnet.cad.dev, Michael Lachmann writes:
> The user can move the move the part in x and y direction (which actual axes
> depend on the view-rotation-matrix). I need to know where is the nearest point
> on the grid for a given screen point 'PS' [x, y, z] (translated into model
> space already)
What do you mean by "translated into model space" ?
Back from World coordinates? By applying inv(VM)?
How can you find a z value for the screen point.
There are many possible values.
(How do you go from 2D to 3D?)
Assuming that you could find a 3D screen point, I think the
easiest way is to transform it back to unrotated grid and simply
round up/down to nearest grid value for, x y and z (independently).
/Lars
> I sum. everything now:
>
> Given is a vector 'GRID', a rotation matrix 'RM' (for part and grid), a view-
> rotation-matrix 'VM' and a screen point 'PS'.
>
> Searched the snapped screen point 'SPS' which is snapped to the nearest grid
> point.
>
> Please help me with that!!!!
>
> Thanks in advance,
> Michael
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Message is in Reply To:
 | | Math Help Needed PLEASE
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| Hy, I'm running into math problems again, after I recogniced whats the problem with the movements in MLCad. Now here is what I would like to do: There is a virtual grid which is bound to a part. The distance of the grid lines is given by a vector (...) (24 years ago, 19-Jun-00, to lugnet.cad.dev)
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