Re: pfBillBoard picking

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Allan Schaffer (allan++at++southpark.engr.sgi.com)
Wed, 25 Aug 1999 22:55:11 -0700 (PDT)

Next message: Javier Abadia: "Not so difficult, is it? (was dynamic texture)"
Previous message: Angus Dorbie: "Re: pfBillBoard picking"
In reply to: Neil Witcomb: "pfBillBoard picking"

Neil Witcomb wrote:
>
> ** High Priority **
>
> I am trying to pick a pfBillboard but for some reason the pick
> routine picks the object behind the bill board if there is one, else
> picks null. The mode is set to pick the nearest so that is not the
> problem.
>
> Is there a problem picking pfBillboard?
>
> The billboard is a single square polygon.

Sorry, just read this, or I would have responded earlier.

Angus describes quite well the reason why calculating an intersection
with a pfBillboard would be so difficult. And as it turns out, we
only test for intersections with the billboard's bounding volume, not
the individual geosets within the billboard node.

It seems to me that the pick should have been able to find the
bounding volume, check in the QueryHit for it, and you should also
verify that the volume is what you'd expect..

Allan

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

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