Re: [Fwd: LOD's in Inventor objects]

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Allan Schaffer (allan++at++southpark.engr.sgi.com)
Wed, 23 Sep 1998 12:32:23 -0700 (PDT)

On Sep 23, 4:21pm, Wilfred Janssen wrote:
> I'm loading an Inventor file into perfly that contains a lot of SoLOD
> nodes. The LOD's are scattered thoughout the scene and have all the same
> ranges set. In perfly I observed that all the LOD-nodes switch on and
> off at the same time (I only have two levels of detail object on and
> off) regardless of the distance to the individual objects. All the LOD's
> seem to be coupled.
> Is there a way to decouple the LODs or am I misunderstanding the
> behaviour.
> Any advice will be appriciated

I don't know the true solution to this problem but it certainly
doesn't sound like the intended behavior. LOD nodes are individually
evaluated in the CULL process and only effect their own children.

I wonder if you have some sort of top-level LOD node as a parent to
-everything- else that is switching to the 'off' level, so the rest
of the graph (the "on" subgraph of that LOD) isn't being traversed.

Perhaps a good way to see what's happening is to view the scene graph
structure in perfly via the "Show Tree" button and verify that the
LODs are laid out as you expect. Or, print the scene graph.

Allan

-- 
Allan Schaffer                                                allan++at++sgi.com
Silicon Graphics                               http://reality.sgi.com/allan

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