[X3D-Public] What is the behavior of Touch/Drag sensors when occluded?

Zlatomir Zarkov zzarkov at vrinternal.com
Sat May 12 02:35:37 PDT 2012

Hello Dave,

There is a Selection node in Contact for that purpose, it is
similar to Collision.


> Let's say you have an object that has a TouchSensor on it. It happens to
> be behind a (let's say) semi-transparent object. Maybe that material has
> a texture that looks like chain-link fence or maybe it's a window.
> Should I be able to touch it?
> I don't see anything in the spec that really addresses this.
> What I would hope for in a knee-jerk way is, it would let me pick
> 'through' transparent textures. But I realize this is a dicey
> proposition to make a blanket rule.
> So my next thought is that it would let me pick through anything that
> doesn't also have a sensor like that on it. But again, easy to find
> examples of why that's not good.
> So ultimately, what I expect, is some sort of boolean or node or
> something that says 'ignore for picking' or something to that effect.
> Anyone know if Contact has such an option?
> Dave A
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Zlatomir Zarkov
e-mail: zzarkov at vrinternal.com

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