Intersection questions
Performer Mailing List (perflist++at++vr.mme.wsu.edu)
Fri, 8 Mar 1996 12:07:39 -0800
I have a question concerning intersections using performer. We are using
Performer in the development of a virtual reality system for design and
evaluation. The system loads parts and assemblies from Pro/E and enables
designers to evaluate and modify the designs for ergononmic considerations. We
use human models linked to tracking devices,etc and HMD's. We have to do
collision detection between the human model and the other models in the
environment. I am aware of the use of segment sets for intersection and the
use of masking and all of that. The problem I have is the fact that to use the
segments that are "attached to" dynamic objects is the fact that you need to
update the position of all of the segments. I have tried using pfNode bounding
boxes set to DYNAMIC but they seem to only give the bounding volume in a local
coordinate system. We have a very detailed scene graph that is composed of a
number of hierarchies of pfDCS's. I was wondering several things. First, what
is the common method of doing intersection testing? Secondly, am I totally off
with regards to the segment sets? And lastly, how can you get the global
position of a small piece of the scene graph, ie a pfGeode, that is very low in
the hierarchy of pfDCS's? Thank you very much for any help.
Scott Angster
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on Mon Aug 10 1998 - 17:52:32 PDT