Hi Marcus,
Marcus Lindblom wrote:
> Hi,
>
> We're using VisitSubTree to reduce the amount of nodes needed, as we
> have one largish component (~200 nodes) in two places, and looking at
> the debug output (my graph generator in the utils dir on the wiki) is a
> bit horrible with many nodes.
>
> So, VisitSubTree works fine, but IntersectAction probably needs some
> work in order to show the correct path.
>
> (Yes, I know, I'm going down a multiple-parents-per-node path here,
> which OpenSG tries to avoid)
Yup. Bad boy! ;)
> Nevertheless, what I mostly need is the actual to-world transform of the
> intersected node, not necessarily the entire path from root to node.
> (Although it might be handy to have as well...)
IMHO that's the only way to do multi-parent right (and Inventor is the only one
that does it). It's just much more expensive than dealing with a single
pointer,
which is why I would like to avoid it, and it's why OpenSG doesn't do
multi-parent.
But given that we introduced multi-parent through the backdoor with
VisitSubTree
anyway we might as well get that one right and keep track of the path where
it's
needed.
> Does it seem a reasonable thing to fix?
Yup.
> If so, how should I go about patching that? Either just grab the
> transform and add get-function for it (similar to Point/Object/Normal)
> or is there some better way?
I would propose to add an optional feature to keep track of the path to the
base
Action. So whenever a node is pushed/popped the Action keeps track of it, if
the
application wants it, and just exposes it as a const std::vector<Node*>&. If
the
tracking is active the IntersectAction would have to copy it on intersect.
Then we would need some helper functions that do useful things on lists of
Nodes, like calculate the accumulated matrix, but it would cover more general
cases than just storing the transform.
Just my $.02
Dirk
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