Two physics related questions

[tjheldna]

Hi All,

 

I just have a few questions about how to do a couple of things in the engine.

 

1. I have some collectable coins that shoot from a broken prop, thats all cool but I always want the body to be facing upright as they fly out and bounce. Is that possible?

 

2. How do I get the centre XYZ of a phyics body?

 

Many Thanks!!

[Mumbles]

1. Set the body's angle with the RotateEntity command before adding the "throwing" force. It will keep this orientation until it hits something.

 

2. Get the Entity's AABB. The mid point of each axis should either be the exact centre, or so close no one will know the difference

 

(C/C++)
TVec3 GetMidpoint(const TEntity &Entity)
{
TVec3 OutputVector;
TVec6 AABB = GetEntityAABB(Entity);
OutputVector.X = ((AABB.X1 - AABB.X0) / 2) + AABB.X0;
OutputVector.Y = ((AABB.Y1 - AABB.Y0) / 2) + AABB.Y0;
OutputVector.Z = ((AABB.Z1 - AABB.Z0) / 2) + AABB.Z0;
return OutputVector;
}

[tjheldna]

Thanks Mumbles. It doesn't have to be exact centre, just round about is fine.

 

can't wait to try it tonight!!

[DigitalHax]

You could always have a physics object that hits the ground, have a separate coin mesh that doesn't have the objects rotation. Only position.

[tjheldna]

You could always have a physics object that hits the ground, have a separate coin mesh that doesn't have the objects rotation. Only position.

 

Hey Thats not a bad idea, I never thought of doing it that way.

[tjheldna]

The solution of creating a physics body and positioning the coin to the body worked a treat! Thanks DigitalHex! The code for object centre is great to, I have a number of instances where I need that.

 

I must say as a new comer to this engine, it is so easy to code in compared to others. Really loving this engine.

 

Thanks again guys!

[DigitalHax]

Not a problem Always happy to help!

 

 

 

I use this technique quite a lot in my coding. Especially in player controllers.