When moving an object via actor.force/impulse/torque etc
I get some regular "stuttering" when running the project.
It looks like the mesh and the actor matrix get out of sync or something
but I don't know if that's really the problem and how to fix this.
I can remember I had this problem in some other engine some time ago too,
but I have no clue how to approach this problem.
Basically, a ball moves smoothly for a second or two, then it has a short "hickup" and
starts to stutter for maybe not even half a second, then smooth movement again, etc.
Any idea what that might be?
Thanks,
tL.
The rough code looks something like this, maybe I did something wrong here?:
Code:
void RBall::create(Object &obj)
{
scale = obj.scale3();
mesh = obj.mesh();
phys = obj.phys();
_matrix = obj.matrixFinal().normalize();
_scaledMatrix = _matrix;
_scaledMatrix.scaleOrnL(scale);
if(phys)
{
actor.create(*phys, 1, true).matrix(_matrix);
actor.obj(this);
}
}
Bool Ball::update()
{
if(Kb.b(KB_W)) actor.addTorque(Vec(-speed, 0, 0));
if(Kb.b(KB_S)) actor.addTorque(Vec(speed, 0, 0));
if(Kb.b(KB_A)) actor.addTorque(Vec(0, 0, speed));
if(Kb.b(KB_D)) actor.addTorque(Vec(0, 0, -speed));
T.pos(actor.matrix().pos);
return 1;
// T.pos --> virtual void pos (C Vec &pos) {_matrix.pos = pos; _scaledMatrix.pos = pos;} //
}
UInt Ball::drawPrepare()
{
actor.draw();
if(mesh) mesh->draw(actor.matrix());
return 1;
}
void RBall::drawShadow()
{
if(mesh) mesh->drawShadow(actor.matrix());
}
EDIT:
Ok, just tested some more things.
The stutter jitter happens when Physics.stepTime / Physics.updatedTime
change from 0.017 to 0.016 on PHYS_TIMESTEP_ROUND which otherwise has a constant value of 0.017 when logged.
The problem gets much better when I use PHYS_TIMESTEP_VARIABLE,
which constantly changes between 0.017 and 0.016 but I still get these stutters.
But by far not so often/regularly.
Is there anything else I could try?
