From: Gernot Goebbels <gernot@beuys.techinfo.rwth-aachen.de>
Subject: TECH: Force Feedback Systems
Date: Wed, 06 Aug 1997 12:28:42 +0200
Message-ID: <33E851DA.446B@beuys.techinfo.rwth-aachen.de>
Organization: Aachen University of Technology / Rechnerbetrieb Informatik


Hi out there,

I'm new in this list and want to say Hello.
It is also the first time that I post 
something because I've got a problem and need 
some suggestions.

Actually I'm working in the field of virtual reality based 
prototyping with Force Feedback Systems. With this system I 
want to manipulate any kind of virtual environment directly. 
That means for example that I don't use any representation 
of my finger to dial a number on my virtually created mobile 
phone but manipulate the digits directly. So what I need is 
a collision detection between my finger (represented by the 
force feedback system) and the virtual digits on my virtual 
mobile phone.

Now the problem that I have is that I don't know how to transfrom 
the coordinate system of my Force Feedback device into the 
coordinate system of my virtual environment because this has another 
scaling behaviour than the coordinate system of the feedback device 
(to create my environment I use the WordToolKit and for viewing I use 
shutter glasses and a monitor working in stereo mode). 
It is evident that the scaling of my environment depends on the 
distance the user looks at the monitor through his glasses further on 
my monitor resolution and many more features. But how to combine these 
features to a scaling factor with regard to the transformation I don't 
know. So if anyone has got advices or recommdendations it would be
great.

Thanks a lot 
		Gernot

P.S. You can also reach me under these email addresses directly

1.gernot@beuys.techinfo.rwth-aachen.de
2.gernot@physiology.rwth-aachen.de