Hi Julien-Charles,
Julien-Charles Lévesque schrieb:
Hi Peter,
What do you mean by a degenerated polytope of volume 0 ? That polytope
definitely doesn't have a null volume since I've been using it to select
objects in my application and it works.
The four planes all have the same starting point because I want the
polytope to be a pyramid coming out from a user's hand, so the planes
-should- all intersect at the summit, no ?
You are right. I did not look closely enough and assumed
you where trying to build a parallel polytope.
The polytope looks to be alright.
Julien-Charles
On Thu, Feb 4, 2010 at 8:35 AM, Peter Hrenka
<[email protected] <mailto:[email protected]>>
wrote:
Hi Julien-Charles,
Julien-Charles Lévesque schrieb:
[...]
Here is my code... stripped down to a minimum. I assume that you
have a 4x4 matrix containing orientation of your selector
(lOrientation) and a vec3 containing it's position (lPosition).
I built the polytope to point in the direction of positive
y-axis. Sorry for the french variable names and comments here
and there... I don't think they hurt readability much at this
level :P
However, I wasn't able to extract a reliable 3x3 rotation matrix
from mouse coordinates. I can only say that this code works well
with the raw 3x3 orientation and position provided by my
tracker. Do you have any idea for a desktop variation ? I can
implement it. I could also integrate all this in the
examplekeyboardmouse, once I've figured out how to do it with a
mouse :P
I would suggest to control the rotation and position
using the keyboard. This should be enough for the
purpose of an osg-example. I think it would be nice
if the polytope would be visualized as a wireframe
model.
I also would suggest of creating a new osgpolytopeintersector-
example because nobody really looks into osgkeyboardmouse
when looking for polytope-intersection functionality...
Cheers,
Peter
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