Martin Reddy (mxr++at++dcs.ed.ac.uk)
Thu, 6 Jun 1996 14:43:56 +0100 (BST)
This is something that I am interested in too. I have seen a few posts
asking this in the past, but never any answers. For myself I need to be
able to compute the size (e.g. projected bounding sphere diameter) and
position of objects in (2D) screen coordinates.
I gather that this is not possible in Performer? (but I'd love to be
proved wrong). As a result I am considering re-inventing the wheel and
manually performing perspective projections on each of my objects. In
order to ensure that I'm doing the same calculations that Performer is
doing to display the object, can anyone on the Performer Team direct me
towards a source (or better yet, source code) which Performer uses to
implement its perspective projection (is it just your standard algorithm
ala Foley & van Dam?).
As a future feature suggestion, I would think that being able to access or
compute the 2D projected coords for objects would be a fairly useful API
feature?? Just my opinion :-)
Cheers,
Martin.
+============================================================================+
| Martin Reddy Dept. of Computer Science |
| University of Edinburgh |
| e-mail : mxr++at++dcs.ed.ac.uk Mayfield Road, EH9 3JZ |
| http://www.dcs.ed.ac.uk/home/mxr/ Tel : (0131) 650 5164 |
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