Re: [osg-users] Adding Constraints to Draggers

2018-10-26 Thread tom spencer 


bam098 wrote:
> However, I don't quite understand it unfortunately. All constrain methods of 
> the class are set to true here and I don't get why this was done.
 I don't see anywhere in the entire osg project where the return from constrain 
is used. I don't think it serves any purpose at this point. Constraints 
manipulate the command to accomplish their task.

Code:
grep -IrnF -- ".constrain" *
include/osgManipulator/Command:61:virtual void accept(const Constraint& 
constraint) { constraint.constrain(*this); }
include/osgManipulator/Command:112:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
include/osgManipulator/Command:149:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
include/osgManipulator/Command:188:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
include/osgManipulator/Command:233:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
include/osgManipulator/Command:278:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
include/osgManipulator/Command:314:virtual void accept(const 
Constraint& constraint) {constraint.constrain(*this); }
 
grep -IrnF -- "->constrain" *
//returns nothing.








bam098 wrote:
> But how is the situation currently? Are osgmanipulator and especially the 
> dragger classes are still used today?
 I have been using osgmanipulator library and have been happy it is available. 
https://gitlab.com/blobfish/cadseer/tree/master/library[/url][/code]

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Re: [osg-users] Adding Constraints to Draggers

2018-10-25 Thread Garfield Pig 
Hi Max??
   Robert is right,add constraint to dragger.
   You can find the constraint work on command in dispatch method  of class 
Dragger.
   As for the example,you can see the class GridConstraint inherited from class 
Contraint.
   Just add breakpoint,and follow the code,you can know how it work clearly. 


-- Original --
From:  "Max Power";
Date:  Fri, Oct 26, 2018 00:14 AM
To:  "osg-users";

Subject:  Re: [osg-users] Adding Constraints to Draggers



Hi Robert,

ah okay, I understand. Thank you for your fast reply.

I saw OpenSceneGraph/examples/osgmanipulator/osgmanipulator.cpp and I noticed, 
that it also uses the Constraint class. However, I don't quite understand it 
unfortunately. All constrain methods of the class are set to true here and I 
don't get why this was done. Okay, but then I will try to take a deeper look 
into the code.

But how is the situation currently? Are osgmanipulator and especially the 
dragger classes are still used today? Or do most people rather write everything 
from scratch instead of using osgmanipulator?

Thank you for your help! :)

Cheers,
Max

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Re: [osg-users] Adding Constraints to Draggers

2018-10-25 Thread Robert Osfield 
Hi Max,

On Thu, 25 Oct 2018 at 17:20, Max Power 
wrote:

> But how is the situation currently? Are osgmanipulator and especially the
> dragger classes are still used today? Or do most people rather write
> everything from scratch instead of using osgmanipulator?
>

As far as I'm aware osgManipulator is used, it's extensible so it should be
able to extend.  I just can't personally guide your extension of it.

Robert.
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Re: [osg-users] Adding Constraints to Draggers

2018-10-25 Thread Max Power 
Hi Robert,

ah okay, I understand. Thank you for your fast reply.

I saw OpenSceneGraph/examples/osgmanipulator/osgmanipulator.cpp and I noticed, 
that it also uses the Constraint class. However, I don't quite understand it 
unfortunately. All constrain methods of the class are set to true here and I 
don't get why this was done. Okay, but then I will try to take a deeper look 
into the code.

But how is the situation currently? Are osgmanipulator and especially the 
dragger classes are still used today? Or do most people rather write everything 
from scratch instead of using osgmanipulator?

Thank you for your help! :)

Cheers,
Max

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Re: [osg-users] Adding Constraints to Draggers

2018-10-25 Thread Robert Osfield 
Hi Max,

I'm afraid the original author of osgManipulator has moved company, where
he developed it, over a decade ago so to know exactly how to use it we all
just have to look at the code an figure it out.  I haven't personally use
osgManipulator in the way you are wanting to use it so can't provide any
guidance myself.

The only public example I'm familiar with is
OpenSceneGraph/examples/osgmaipulator/osgmanipulator.cpp.

Cheers,
Robert.

On Thu, 25 Oct 2018 at 15:50, Max Power 
wrote:

> Hi,
>
> I'm quite new to OpenSceneGraph. I actually just finished to read the book
> "OpenSceneGraph 3.0 Beginner's Guide" and now I want to go a bit further.
>
> Currently, I try to move objects via the mouse. I already saw, that I can
> use the class osgManipulator::Dragger for this. Here I wrote my own
> CompositeDragger, which is basically a combination of a
> RotateCylinderDragger and a Translate1DDrager. This means I can move the
> object forwards and backwards and I can rotate it via mouse. I already got
> this working.
>
> However, I don't want to translate the object infinitely forwards or
> backwards. I just want to translate it e.g. 10 units back or 5 units
> forward at max. Or I want to translate it only within a certain area of the
> world coordinate system.
>
> How could I do this? I assume the osgManipulator::Contraint is helpful
> here. However, I haven't found any examples and I don't know how to apply
> it.
>
> I hope this wasn't asked before. At least I couldn't find anything
> similar. Are there any examples somewhere online, which you can recommend
> to look at?
>
> Thank you!
>
> Cheers,
> Max
>
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>
>
>
>
>
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