[ODE] "static" Geom problem

[Matthew Harmon]

Hey thanks... I was going to do something similar except I wasn't sure how
the system would act with two quadtree spaces colliding together (I'd need
to have a quadtree for both.)

I'd still love to know why my geoms are all potential collides when not
assigned to a body.  I hate to move forward before I understand the problem.

-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org] On Behalf Of LR
Sent: Thursday, April 13, 2006 5:51 PM
To: ode at q12.org
Subject: Re: [ODE] "static" Geom problem

Hi,
 
I can give you the way i use: 
 
i have 3 spaces : one contains the static geoms (space 1), another the
dynamic geoms (space2)  and the third contains space 1 and space 2
if space is the static space (witch contains statics geoms) i do not try to
collide:
 
 
if (dGeomIsSpace (o1) || dGeomIsSpace (o2)) 
  {
  dSpaceCollide2 (o1,o2,data,&nearCallback);
  if (dGeomIsSpace (o1)) 
    {
    if((dSpaceID)o1!=StaticSpaceID) dSpaceCollide
((dSpaceID)o1,data,&nearCallback);
    }

  if (dGeomIsSpace (o2)) 
    {
    if((dSpaceID)o2!=StaticSpaceID) dSpaceCollide
((dSpaceID)o2,data,&nearCallback);
    }
  }
else 
  {
  ...
  int n = dCollide (o1,o2,N,(dContactGeom *)
&contacts[0].geom,sizeof(dContact));
  ...
  }
Laurent.

________________________________

Objet : [ODE] "static" Geom problem

I'm having some troubles with "static" geoms. those that are not assigned to
a body. 

I'm counting the number of potential collision pairs I get from
dSpaceCollide(), and it seems that if a geom is not assigned to a body it
always generates potential contacts with other similar geoms.  However, if I
assign them to a body, they don't (unless they get very close, of course.) 

I'm using a quadtree space, but the same happens for even a simple space.
These are almost all simple box geoms.

 

I tried calling dGeomMove(), just in case these static geoms were all being
put in the root of the quadtree, but that didn't seem to help.

 

Any thoughts here?




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