No, WakeupOnViewPlatformEntry triggers when "the center of a ViewPlatform
enters a specified region" (API Specification). It provides functionality
similar to the VRML ProximitySensor.
I can't believe the Java 3D team just forget this one. I would have thought
that visibility-triggered behavior would be important to many applications.
Mike Wiese
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Tachio
Terauchi
Sent: Tuesday, February 23, 1999 3:48 AM
To: Mike Wiese
Cc: [EMAIL PROTECTED]
Subject: Re: [java3d] How to implement a visibility sensor
Won't WakeupOnViewPlatformEntry do this?
-Tachio
On Tue, 23 Feb 1999, Mike Wiese wrote:
> Hi all,
>
> I'm trying to figure out how to implement something like the VRML
> VisibilitySensor node.
>
> This would be a WakeupCriterion which triggers when an object swings
> into/out of view i.e. when the scheduling region of the object is visible
> whilst the activation volume of the ViewPlatform intersects with the
> scheduling region of the object. The WakeupOnActivation class is no good,
> because it triggers on proximity to the ViewPlatform, even if the object
of
> interest is 180 degrees behind the ViewPlatform.
>
> Have I missed something (v. likely)? If not, why did Sun not include this
> with the other WakeupCriterions?
>
> Is it possible to hack this together by moving a (roughly) frustum-shaped
> object with the ViewPlatform and pick up the CollisionEntry/CollisionExit
> events (yuk!)?
>
>
> Mike Wiese
>
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