Hi, when im moving ball actor on flat ground made of box actors ball often jump on edge of box actor.

Here edited code from tutorial Physics/actors to check what i mean.
(my edits in bold text)

Quote:/******************************************************************************/
Actor ground, ground2, ground3, ground4,
ground5, ground6, ground7, ground8,
box ,
ball ;
/******************************************************************************/
void InitPre()
{
EE_INIT();
App.flag=APP_MS_EXCLUSIVE;
}
bool Init()
{
Cam.dist=4;

// create physics
Physics.create(EE_PHYSX_DLL_PATH); // create physics by specifying the path to physx dll's

// create actors
ground.create(Box (5, 1, 5, Vec(0.0, -2, 0)), 0); // create ground actor from Box and density=0 (which means it's a static actor - will not move)
ground2.create(Box (5, 1, 5, Vec(0.0, -2, 5)), 0);
ground3.create(Box (5, 1, 5, Vec(0.0, -2, 10)), 0);
ground4.create(Box (5, 1, 5, Vec(0.0, -2, 15)), 0);
ground5.create(Box (5, 1, 5, Vec(5.0, -2, 0)), 0); // create ground actor from Box and density=0 (which means it's a static actor - will not move)
ground6.create(Box (5, 1, 5, Vec(5.0, -2, 5)), 0);
ground7.create(Box (5, 1, 5, Vec(5.0, -2, 10)), 0);
ground8.create(Box (5, 1, 5, Vec(5.0, -2, 15)), 0);
box .create(Box (0.3 , Vec(0.1, 1, 0)));
ball .create(Ball(0.3 , Vec(2.5, 0, 2.5)), 10);

return true;
}
/******************************************************************************/
void Shut()
{
}
/******************************************************************************/
bool Update()
{

if(Kb.bp(KB_ESC))return false;
CamHandle(0.1, 10, CAMH_ZOOM|CAMH_ROT);
// physics update
{
Physics.startSimulation(); // start frame simulation

// physics simulation takes some time, so you can do some calculations here
// important : you may not modify actors between Physics.startSimulation() and Physics.stopSimulation()

Physics.stopSimulation(); // get results of frame simulation
}


flt s=30;

// add forces to ball
if(Kb.b(KB_UP ))ball.addForce(Vec( 0, 0, 1)*s);
if(Kb.b(KB_DOWN ))ball.addForce(Vec( 0, 0, -1)*s);
if(Kb.b(KB_LEFT ))ball.addForce(Vec(-1, 0, 0)*s);
if(Kb.b(KB_RIGHT))ball.addForce(Vec( 1, 0, 0)*s);

// add forces to ball according to camera
if(Kb.b(KB_W))ball.addForce( !PointOnPlane(Cam.matrix.z, Vec(0, 1, 0))*s);
if(Kb.b(KB_S))ball.addForce(-!PointOnPlane(Cam.matrix.z, Vec(0, 1, 0))*s);
if(Kb.b(KB_A))ball.addForce(-!PointOnPlane(Cam.matrix.x, Vec(0, 1, 0))*s);
if(Kb.b(KB_D))ball.addForce( !PointOnPlane(Cam.matrix.x, Vec(0, 1, 0))*s);

// add velocity to ball
if(Kb.bp(KB_SPACE))ball.addVel(Vec(0, 3, 0));
return true;
}
/******************************************************************************/
void Draw()
{
D .clear();
Physics.draw (); // draw physical actors
}
/******************************************************************************/

Just move on the ground and You will see. any ideas how to fix that?

Hey! I'm sure it has something to do with the density of your ball.

Thanks for answer but what do You mean? I changed density from 10(i dont know why it was 10 ) to 1 and its all the same.

sorry! the ball actor mass. if it is a heavier mass (which takes more force to move) the less likely it will bounce when colliding with the corners of the ground box

The reason of ball being 10 density because of
ball .create(Ball(0.3 , Vec(2.5, 0, 2.5)), 10);

About jumpy, it could be due to being different actor.

Thank You all but what i need is perfectly flat ground.

I built your version of the physics tutorial (I'm still on 1.0) and it works fine. the ball runs smoothly across all ground actors. The only difference in my code from yours is the Physics.create function "../installation/PhysX"

Might not be much help but maybe there is a difference in our physics

When i was looking for that engine stuff in Physics i found this:
i dont fully understand it but setting skin to 0 solves the problem

Thank You everyone for help! Its very nice community i hope ill get good enough some day to help others.

@kasinova Now i believe ball wasnt jumpy when You tested because example code was quite bad. Check that if You want: