[osg-users] Is it possible to cull/visit based on the negative result instead of the positive one?

[Robert Osfield]

HI Michael,

The OSG doesn't support changing the node mask test as it's a inline method
in NodeVisitor.

        /** Method to called by Node and its subclass' Node::accept()
method, if the result is true
          * it is used to cull operations of nodes and their subgraphs.
          * Return true if the result of a bit wise and of the
NodeVisitor::_traversalMask
          * with the bit or between NodeVistor::_nodeMaskOverride and the
Node::_nodeMask.
          * default values for _traversalMask is 0xffffffff,
_nodeMaskOverride is 0x0,
          * and osg::Node::_nodeMask is 0xffffffff. */
        inline bool validNodeMask(const osg::Node& node) const
        {
            return (getTraversalMask() & (getNodeMaskOverride() |
node.getNodeMask()))!=0;
        }

Robert.


On 15 June 2015 at 11:24, michael kapelko <kornerr at gmail.com> wrote:

> Hi.
> I'm implementing node picking.
>
> As I understood, the usual approach is:
> 1) go through all nodes and set their node masks to some custom value like
> 0x1
> 2) set pickable/selectable node masks to some custom value like 0x2
> 3) set osgUtil::IntersectionVisitor's traversal mask to 0x2
> 4) IntersectionVisitor visits only those nodes that have 0x2 mask
>
> I think the following approach is easier:
> 1) set pickable/selectable node masks to some custom value like
> current_node_mask MINUS 0x2
> 2) set IntersectionVisitor's traversal mask to default_node_mask MINUS 0x2
> 3) IntersectionVisitor visits only those nodes that have 0x2 mask EXCLUDED
>
> Am I correct with my assumption? Can OSG do that? Or why doesn't it do
> that?
> Thanks.
>
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