Re: [Ardev-users] Picking with openGL and ARDev

[David O. <raz...@gm...>]

Hi Christine, fancy seeing you here! I didn't realize you were doing
robotics work too.

I know there are some issues with the way ardev does it's camera
transforms, which is on my list of things to fix, but as long as you
are using the same transform in select mode as in render mode, that
shouldn't be an issue. The way it only works in the center of the
screen makes it sound like some kind of projection problem. It would
also be worth checking that the mouse coordinates are what you expect
them to be. I'm afraid I can't assist much without more detail.

I can't think of any reason why opengl picking wouldn't work with
ARDev. One thing to be aware of is that ARDev objects are drawn in
random order, and translucent objects are not written into the depth
buffer. This could mean that you end up picking something behind the
object you intended.

If you do get it working, it would be nice if you could submit a
patch. ARDev does have some sort picking built in, but it is broken
too and as far as I know just selects objects in the general area, not
on a per pixel basis.

Thanks,
David

2010/1/28 cbar141 cbar141 <cb...@au...>:
> Hey,
>
> I am currently trying to implement picking using OpenGL with ARDev. I
> got your code to implement picking from
> http://gpwiki.org/index.php/OpenGL:Tutorials:Picking but I am having
> some issues. What my program does is it renders a cube on top of a
> fiducial marker on a robot. I use picking to select each face on the
> cube individually. The program is able to correctly use picking to
> select the faces of the cube while the robot is in the centre of the
> screen. But when the robot is moved to either side of the screen the
> faces of the cube cannot be selected when they are clicked on. Instead
> if the mouse is clicked a little bit away from a face, the face is
> then selected. It seems as though when the robot is not in the middle
> of the screen the program thinks the cube has been rendered to the
> side of where it is being displayed.
> Is picking compatible with ARDev? and if so do you have any
> suggestions as to how I could fix the problem?
>
> Kind regards,
> Christine Barber.
>
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