Re: [osg-users] Clarification with regard to Dragger

2009-12-11 Thread Robert Osfield 
Hi Neil,

I can't follow your email, so can't comment specifically.  I can say
that I did a refactor of osgManipulator a couple of months back that
is now available in the 2.9.6 dev release, and svn/trunk.  This
refactor makes it easier to use so I would recommend using this.

I'm not the original author of osgManipulator so prior to my refactor
the code base was a bit of uknown, but since the refactor it is a bit
more familiar, which means I have a better chance of understanding
issues/code so moving this the latest OSG would help with support as
well.

Robert.

On Fri, Dec 11, 2009 at 12:34 AM, Neil Clayton n...@shinywhitebox.com wrote:
 Hi,

 I'm fairly new to OSG, and am wondering if my understanding of Draggers is 
 correct.

 I've a scene with a graph like so:   ClearNode - Black box - Group ( { Pat 
 - Geode}, { Dragger} ). The real graph is a touch more complex, but it's 
 pretty simple. A few geometry objects only at the moment. I'm missing a 
 matrix transform for the dragger in the above - but it gives the idea.

 I'm manipulating planes of data. So while it's in perspective, everything 
 sits on the y=0 plane.
 When I click, sometimes the dragger is selected, sometimes not.

 Printing out the objects intersected within Dragger::handle, it seems like 
 it's either random or based (maybe?) on z order.  If the nodepath containing 
 the TranslatePaneDragger happens to be the first it works. Otherwise it 
 doesn't.

 Dragger seems to assume that the first intersection will always contain the 
 dragger node.  Which I'm not finding to be the case.  I modified dragger so 
 that it examines all intersections (and remembers the correct iterator, 
 passing that to ::handle() for ::DRAG and ::RELEASE events), and now it works 
 fine.

 Have I misunderstood how draggers work though?  I'm worried that I've 
 modified code because of my own lack of understanding of OSG.

 Cheers,
 Neil

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Re: [osg-users] Clarification with regard to Dragger

2009-12-11 Thread Jean-Sébastien Guay 

Hello Neil,


When I click, sometimes the dragger is selected, sometimes not.


If you want clicks to always select the dragger, then you can just use 
node masks. Use a given bit to indicate the dragger, then set the 
dragger to this node mask, and remove that bit from your other objects' 
node masks. Then when picking, use that bit as your intersection 
visitor's traversal mask.


Hope this helps,

J-S
--
__
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   http://www.cm-labs.com/
http://whitestar02.webhop.org/
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Re: [osg-users] Clarification with regard to Dragger

2009-12-11 Thread Neil Clayton 
Thank you. That does help. I will take a look at node masks and see what I come 
up with.

Cheers,
Neil

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