[SOLVED] Ammo timesteps?

Yohami_Zerpa · March 15, 2020, 1:10pm

How can I change the precision of the physics engine? trying to improve collisions for a billiards game

Leonidas · March 15, 2020, 1:20pm

The timestep for updating the physics simulation is set in the RigidBodyComponentSystem class, not exposed for editing in the docs but I think you can change it simple by doing:

this.app.systems.rigidbody.fixedTimeStep = 1/90;

// you can also experiment increasing the number of sub steps
this.app.systems.rigidbody.maxSubSteps = 13;

github.com

playcanvas/engine/blob/14a873d5ca58b582fb0ac547bc611145a11ef819/src/framework/components/rigid-body/system.js#L164


    this.ComponentType = pc.RigidBodyComponent;
    this.DataType = pc.RigidBodyComponentData;


    this.contactPointPool = new pc.AllocatePool(ContactPoint, 1);
    this.contactResultPool = new pc.AllocatePool(ContactResult, 1);
    this.singleContactResultPool = new pc.AllocatePool(SingleContactResult, 1);


    this.schema = _schema;


    this.maxSubSteps = 10;
    this.fixedTimeStep = 1 / 60;
    this.gravity = new pc.Vec3(0, -9.81, 0);


    this.on('remove', this.onRemove, this);
};
RigidBodyComponentSystem.prototype = Object.create(pc.ComponentSystem.prototype);
RigidBodyComponentSystem.prototype.constructor = RigidBodyComponentSystem;


pc.Component._buildAccessors(pc.RigidBodyComponent.prototype, _schema);


Object.assign(RigidBodyComponentSystem.prototype, {

Yohami_Zerpa · March 15, 2020, 1:28pm

Thank you. This plus CCD solves all the physics issues

Yohami_Zerpa · March 15, 2020, 11:10pm