[osg-users] about node mask

[Gianluca Natale]

Hi All.

I’m setting node masks so that I can use different node visitors with different traversal masks
to exclude some node from traversal.

But I’m a bit confusing for the description of the tutorial NodeMaskDemo
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/NodeMaskDemo

and the real implementation.

 

I mean that in the tutorial I read this:

“During the pre-render traversal of the scene graph a logical OR comparison of the current node mask and camera's node mask is made.

If the comparison is non-zero, the traversal will continue and if there is geometry associated with the node it will be sent to the render graph for rendering.

If the logical OR is zero, traversal will not continue further down the scene. Any associated geometry will not be rendered.”

 

While in the implementation of the nodeVisitor I see:

 

inline bool validNodeMask(const osg::Node& node) const

{

    return (getTraversalMask() & (getNodeMaskOverride() | node.getNodeMask()))!=0;

}

 

So, I guess that the tutorial meant AND comparison and not OR comparison.

Am I wrong?

 

Thanks in advance

Gianluca

 

[Jason Daly]

Gianluca Natale wrote:

So, I guess that the tutorial meant AND comparison and not OR comparison.

Am I wrong?

No, you're correct� :-)

It's actually doubly wrong, it should say "bitwise AND", not "logical OR"

--"J"