Disabling Randomization in Ammo.js for Determinism

To disable the randomization flags in Ammo.js and achieve deterministic physics simulation, you'll need to access the solver info and modify its solver mode. Here's how you can do it:

JAVASCRIPTCopied
// Get the physics world's solver info
const world = yourAmmoWorld; // Your existing Ammo.js world
const solver = world.getSolverInfo();

// Get current solver mode
const currentMode = solver.get_m_solverMode();

// Define the flags to clear
const SOLVER_RANDOMIZE_ORDER = 1;
const SOLVER_USE_WARMSTARTING = 2;

// Clear the flags using bitwise operations
const newMode = currentMode & ~(SOLVER_RANDOMIZE_ORDER | SOLVER_USE_WARMSTARTING);

// Set the new solver mode
solver.set_m_solverMode(newMode);

Additional Tips for Determinism in Ammo.js

1. Fixed Timestep: Always use a fixed timestep for physics simulation:

   JAVASCRIPTCopied
   const fixedTimeStep = 1.0 / 60.0; // 60 Hz
   world.stepSimulation(fixedTimeStep, 0, fixedTimeStep);

2. Disable Sleep: Consider disabling the automatic deactivation of objects:

   JAVASCRIPTCopied
   const body = yourRigidBody;
   body.setActivationState(4); // DISABLE_DEACTIVATION

3. Consistent Initial State: Always initialize your physics objects with exactly the same positions, rotations, and velocities.

4. Avoid Multithreading: If possible, disable multithreading features as they can introduce non-determinism.

5. Fixed Random Seeds: If your simulation uses any random values, make sure to use a fixed seed.

These changes should help you create a more deterministic version of the dice simulation for your virtual tabletop.