UpdatePhysics()

[SpiderPig]

After looking through the Newton SDK I saw a couple of hooks; PreUpdate() and PostUpdate() and I was wondering at what point is the UpdatePhysics() hook called?  Is it before or after physics has been calculated / applied?

[SpiderPig]

So once again I am attempting to break things - @Josh I have question for you... I am using Newton functions to add a PreUpdate callback to the newton world but the callbacks are not being called unless I call NewtonUpdate myself, is World::Update() not calling NewtonUpdate?

[Josh]

World::Update only calls NewtonUpdate when enough time has passed for a physics update to be needed.

[SpiderPig]

Thank you!  That answer led me to finding the problem.  This is how I was getting the NewtonWorld;

NewtonWorld* GetNewtonWorld()
{
	return ((NewtonDynamicsPhysicsDriver*)NewtonDynamicsPhysicsDriver::GetCurrent())->collisionWorld;
}

Which worked for a lot of things but it didn't match when I got the world like this;

Model* bn = Model::Box();
mdl->SetShape(Shape::Box());
auto body = ((NewtonDynamicsBody*)mdl->body)->body;

MainFrame::newtonWorld = NewtonBodyGetWorld(body);

With the later the callbacks worked!

 

Quote

After looking through the Newton SDK I saw a couple of hooks; PreUpdate() and PostUpdate() and I was wondering at what point is the UpdatePhysics() hook called?  Is it before or after physics has been calculated / applied?

I take it then this is a callback in UpdateWorld()?  Updating the physics when the timing is correct?

[Josh]

• PreUpdate()
• NewtonUpdate()
• PostUpdate()

The collision world is an extra world for storing collision objects in. The World class has a Simulation object that can be cast to a NewtonDynamicsSimulation object, which contains a member for the Newton world.

[SpiderPig]

Thanks!  Worked perfectly.