Re: [osg-users] LineOfSight intersection returning geometry

[Robert Osfield]

HI Tony,

On 16 February 2016 at 05:00, Tony Vasile  wrote:
> By the way does OpenSceneGraph have a separate mask for intersection as well 
> as rendering? I have some geometry that I don't want to intersect but do want 
> to be rendered.

The NodeVisitor base class has a setTraversalMask() method for
controlling which mask to && against node mask's with.  This means the
osgUtil::IntersectionVisitor class inherits this setTraversalMask().
The View::computrIntersection(..) convenience methods all take a
traversalMask that they pass on to the IntersectionVisitor.

i.e.
View:bool computeIntersections(float x,float y,
osgUtil::LineSegmentIntersector::Intersections&
intersections,osg::Node::NodeMask traversalMask = 0x);

Robert.
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Re: [osg-users] LineOfSight intersection returning geometry

[Tony Vasile]

Thanks for the info. 

By the way does OpenSceneGraph have a separate mask for intersection as well as 
rendering? I have some geometry that I don't want to intersect but do want to 
be rendered.


Tony V

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Re: [osg-users] LineOfSight intersection returning geometry

[Robert Osfield]

Hi Tony,

You only need to set the mask on node at the top of the subgraph for
the whole subgraph to be culled from a traversal.

Robert.

On 4 February 2016 at 00:43, Tony Vasile  wrote:
> So if you have a large piece of geometry like terrain or ocean is simply a 
> case of setting the right mask on the root node of this large geometry to 
> avoid or allow intersections? Or do you have set the mask on all the pieces 
> of said large geometry?
>
> 
> Tony V
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=66187#66187
>
>
>
>
>
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Re: [osg-users] LineOfSight intersection returning geometry

[Tony Vasile]

So if you have a large piece of geometry like terrain or ocean is simply a case 
of setting the right mask on the root node of this large geometry to avoid or 
allow intersections? Or do you have set the mask on all the pieces of said 
large geometry?


Tony V

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Re: [osg-users] LineOfSight intersection returning geometry

[Robert Osfield]

Hi Tony,

On 22 January 2016 at 02:31, Tony Vasile  wrote:
> By the way what are the following fields in 
> osgUtil::LineSegmentIntersector::Intersection :
>
> double  ratio;
> osg::NodePath   nodePath;
> osg::ref_ptr drawable;
> osg::ref_ptrmatrix;
> osg::Vec3d  localIntersectionPoint;
> osg::Vec3   localIntersectionNormal;
> IndexList   indexList;
> RatioList   ratioList;
> unsigned intprimitiveIndex;
>
> Things like the nodePath, drawable, localIntersectionPoint, and  the 
> localIntersectionNormal, I can work out what the are. But what are the ratio, 
> ratioList, primitiveIndex, and the matrix? Is the matrix a transformation 
> matrix?

The IndexList contains the list of vertex indices of the primitive
that has been intersected, and the RatioList contains the weighting of
those vertices which when added together with their ratios gives the
intersection point.  This allows you to compute things like texture
coordinates, colours etc.  The primitiveIndex is the primitive number
into the geometry that the intersected primitive lies.  The matrix is
the accumulated transformation matrix that takes the local coordinate
point into coordinate frame of the root of the intersection traversal.
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Re: [osg-users] LineOfSight intersection returning geometry

[Robert Osfield]

Hi Tony,

The TraversalMask is part of the osg::NodeVisitor base class, so simply do:

   intersectionVisitor.setTraversalMask(0x01);

Cheers,
Robert.

On 21 January 2016 at 07:57, Tony Vasile  wrote:
> Okay so I found this code:
>
>
> Code:
>
> osg::ref_ptr intersectorGroup = new 
> osgUtil::IntersectorGroup();
>
> for(unsigned int r=0; r {
> for(unsigned int c=0; c {
> osg::Vec3d s = start + deltaColumn * double(c) + deltaRow * 
> double(r);
> osg::Vec3d e = end + deltaColumn * double(c) + deltaRow * 
> double(r);
> osg::ref_ptr intersector = 
> new osgUtil::LineSegmentIntersector(s, e);
> intersectorGroup->addIntersector( intersector.get() );
> }
> }
>
>
> osgUtil::IntersectionVisitor intersectVisitor( 
> intersectorGroup.get(), new MyReadCallback );
> scene->accept(intersectVisitor);
>
>
>  in the osgintersections.cpp example. One thing that I can't find is how do I 
> set a traversal mask?
>
> Tony
>
> 
> Tony V
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=66069#66069
>
>
>
>
>
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Re: [osg-users] LineOfSight intersection returning geometry

[Tony Vasile]

Thanks for that. I found my answer about an hour after posting this one.

By the way what are the following fields in 
osgUtil::LineSegmentIntersector::Intersection :

double  ratio;
osg::NodePath   nodePath;
osg::ref_ptr drawable;
osg::ref_ptrmatrix;
osg::Vec3d  localIntersectionPoint;
osg::Vec3   localIntersectionNormal;
IndexList   indexList;
RatioList   ratioList;
unsigned intprimitiveIndex;

Things like the nodePath, drawable, localIntersectionPoint, and  the 
localIntersectionNormal, I can work out what the are. But what are the ratio, 
ratioList, primitiveIndex, and the matrix? Is the matrix a transformation 
matrix?


Tony V

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Re: [osg-users] LineOfSight intersection returning geometry

[Tony Vasile]

Okay so I found this code:


Code:

osg::ref_ptr intersectorGroup = new 
osgUtil::IntersectorGroup();

for(unsigned int r=0; raddIntersector( intersector.get() );
}
}


osgUtil::IntersectionVisitor intersectVisitor( intersectorGroup.get(), 
new MyReadCallback );
scene->accept(intersectVisitor);


 in the osgintersections.cpp example. One thing that I can't find is how do I 
set a traversal mask?

Tony


Tony V

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