ConvexHullModifier on collisions within a compound collision

[pHySiQuE]

If I have a compound collision made of two collision objects, can I use a ConvexHullModifier on one of the collision objects, and have the compound collision affected by that? For example, if I had a compound collision made of a car body and a car door, can I use a ConvexHullModifier to rotate the car door?

I would normally use a joint in this situation, but I am just using it as an example to describe my question.

[Julio Jerez]

yes you can, it will n collide in the same frame though, but that should be ok.

[pHySiQuE]

Let's say I do the following (psuedocode). Will both body0 and body1 be scaled (2,1,1) or will just body0 be affected?

Code: Select all

collision = NewtonCreateBox(1,1,1)

body0 = NewtonCreateBody(collision);
body1 = NewtonCreateBody(collision);

collision = NewtonBodyGetCollision(body0)
modifier = NewtonCreateConvexHullModifier(collision)

float mat[16];
mat[0]=2; mat[1]=0; mat[2]=0; mat[3]=0;
mat[4]=0; mat[5]=1; mat[6]=0; mat[7]=0;
mat[8]=0; mat[9]=0; mat[10]=1; mat[11]=0;
mat[12]=0; mat[13]=0; mat[14]=0; mat[15]=1;

NewtonConvexHullModifierSetMatrix(modifier,mat)

Or is this the correct way to do this?:

Code: Select all

collision = NewtonCreateBox(1,1,1)
modifier = NewtonCreateConvexHullModifier(collision)

body0 = NewtonCreateBody(modifier);
body1 = NewtonCreateBody(collision);

float mat[16];
mat[0]=2; mat[1]=0; mat[2]=0; mat[3]=0;
mat[4]=0; mat[5]=1; mat[6]=0; mat[7]=0;
mat[8]=0; mat[9]=0; mat[10]=1; mat[11]=0;
mat[12]=0; mat[13]=0; mat[14]=0; mat[15]=1;

NewtonConvexHullModifierSetMatrix(modifier,mat)

[pHySiQuE]

My second code is the correct usage. This is pretty cool, because you can just create a collision once and then create a collision modifier for each body you assign it to.

[dangelo.davide]

Hi all,
i used to use NewtonCreateConvexHullModifier, now in news sources I cannot find that. What happened to it?

[Sweenie]

The colliders now have their own local matrix so ConvexHullModifier won't be necessary anymore, or rather the collision instance has it's own matrix.
viewtopic.php?f=9&t=7135&p=49134

[dangelo.davide]

The colliders now have their own local matrix so ConvexHullModifier won't be necessary anymore, or rather the collision instance has it's own matrix.
http://www.newtondynamics.com/forum/vie ... 35&p=49134

Thx a lot my friend!!! I'm using ogrenewt to integrate last newton libs with Ogre3d.
The wrapper OgreNewt is really outdated and I had deleted and commented a lot of class in the wrapper sources...