peterf@kuling.UUCP (Peter Fagerberg) (05/24/87)
I am currently working on a project with lots of graphics and since
I'm not really a graphics expert, like most of you people, I was
wondering if you could help me with a few pointers in the right
direction.
Here are my two problems:
Problem #1 involves adjusting the values of a set of discrete points
generated by an industrial scanning machine. Maybe you've heard about
these machines; car designers often make a prototype of a new car
model in clay and that model is scanned so that you can work on it
with CAD-computers. The problem is that the scanning-machine uses a
little needle with a round point that gives a certain (known) offset
to the surface being measured. In order to adjust the values I want to
approximate how the surface looks in a ceratin point by looking at its
neighbours (2,4 or 8 of em'), construct the plane in that point and
find the normal vector to that plane. If I know the normal
vector, all I have to do is move the point 'offset' millimeters in
that direction.
Problem #2 is a little harder (I think :-)). I need an algorithm,
preferably fast, that measures the distance between a point in space
and a Bezier or B-spline surface.
Thanks in advance,
Please E-mail me directly and if anyone else is interested - send me a
little note (E-note? :-)) and I'll be glad to summarize.
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Peter Fagerberg UUCP: {seismo,enea,mcvax,decwrl,...}!kuling!peterf
Applied Computer Science ARPA: kuling!peterf@sismo.css.gov
Uppsala University Analog: +0046 18-128286 or 8-102927