[ODE] Complex Body Creation

[Bram Stolk]

achaudhry wrote:
> Thanks for your reply, 
> It was really helpfull. I am nw able to create my composite body, comprising
> of various boxes. the problem is that somehow this body is not participating
> in simulation.
> 
>  Even after positioning the body in mid air, above ground plane, gravit forces
> are not acting on it. I have checked gravoty, and its ON. 
> 
> Also on applying force etc to this body doesnt cause any change to it. 

You do run a Step on the same world, that your body is created in?

Did you set the grav accel with WorldSetGravity() ?

Compare your code with test_boxstack, it should work.

   Bram


> 
> I am not sure if i am doing everything correctly or not. 
> Used the help from wiki . 
> 
> Any help would be gr8. 
> thanks, 
> amber
> 
> From: Bram Stolk <bram at sara.nl>
> To: achaudhry <achaudhry at ariworld.com>
> Cc: ode at q12.org
> Sent: Thu, 10 Aug 2006 11:50:04 +0200
> Subject: Re: [ODE] Complex Body Creation
> 
> achaudhry wrote:
>> hi, 
>> I am trying to create a single object which comprises of 4 boxes attached in a
>> fixed manner. 
>> to create this complex object, i am currently creating seperate boxes and then
>> attaching them using Fixed joints. Is there any other method of creating this
>> complex object? 
>>
>> Also after creation, for changing the orientation etc of the complez ogject, i
>> have to currently change orientation for all individual boxes, is there a way
>> to group these boxes together as one single object and then perform operations
>> on them as a single entity? 
> 
> yes... look at ode/test/test_boxstack.cpp
> 
> What you need to do, is attach multiple geoms to a single body.
> Each geom is transformed by a transformgeom.
> 
> So to make a you object, you would create:
> 
> - 1 body
> - 4 box geoms
> - 4 trf geoms
> 
> This is much better than fixed joints, computes much faster,
> less instability, more conventient to code, etc.
> 
>     Bram
> 
>> Regards, 
>> Amber
>> _______________________________________________
>> ODE mailing list
>> ODE at q12.org
>> http://q12.org/mailman/listinfo/ode
>