Re: [Plib-devel] Nested LOD selectors almost works...

[Steve B. <sjb...@ai...>]

"Vallevand, Mark K" wrote:
> 
> That's it!
> 
> Yes, all of my tiles share the same origin.

> However, the bounding sphere for each tile is in the
> correct location.
> 
> The solution is what?  Insert a transform branch above the
> LOD Selector?

Above the LOD selector - yes.

> A transform branch in place of the regular branch?

No.

It's a hard call.  Some API's use the center of the
bounding sphere as the point to measure LOD from - but
the problem with that is that SSG auto-computes your
bsphere's for you (sometimes on-the-fly) - and you have
no control of where it ends up.

I *could* (and perhaps in retrospect *should*) have
added a user-specified origin for the LOD - but that
would add an additional transform to the CULL - and
if you are going to do that, you might as well add
an ssgTransform...it's the same amount of math - and
in many cases, the user wants a transform there anyway.

So - well - it's a hard call...and it is the way it is.

You can always spin off a derived class of your own of
course.

-- 
Steve Baker                  http://web2.airmail.net/sjbaker1
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