Re: Intersections with lines and points under Performer?

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Michael Jones (mtj++at++babar)
Fri, 27 Oct 1995 09:20:09 -0700

On Oct 27, 10:46am, Nicolas Gauvin wrote:
> Subject: Intersections with lines and points under Performer?
:
:Here is a quick question for the Performer development team:
:
:When intersections, and thus picking, with lines and points is planned
:to be implemented?

It's not in Performer 2.0, and is not scheduled for 3.0 but we
could look at that. I have a question about the feature. Such
intersections require the construction of a volume (cylinder or
cone, parallelpiped or frustum) about the intersection ray that
database objects are then classified against. The cylinder and
cone (for ortho and perspective, resp.) style provides an "is
there a point within an n-pixel circle" type of picking result,
while the squarish volume gives picking within an NxN screen
aligned square. Is one of these shapes more appropriate to your
application than the other?

Votes and/or discussion appreciated,
Michael Jones

-- 


Be seeing you,      Phone:415.933.1455  Fax:415.965.2658 M/S:8U-590
Michael T. Jones    Silicon Graphics, Advanced Systems Division
mtj++at++sgi.com         2011 N. Shoreline Blvd., Mtn. View, CA 94039-7311
                    "Du musst Amboss oder Hammer sein" -- Goethe

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