JavaScript navigation mesh construction, path-finding, and spatial reasoning toolkit. WebAssembly port of Recast Navigation.
db2aa1b: feat(Crowd): improve 'update' method, add support for fixed time stepping with interpolation
The previous update method did a form of variable time stepping with a target time step.
This has been replaced with a method that supports fixed time stepping, variable time stepping, and fixed time stepping with interpolation.
The new method signature is:
update(dt: number, timeSinceLastCalled?: number, maxSubSteps?: number): void;
To perform a variable sized time step update, call update with the time since the last call.
crowd.update(deltaTime);
Similarly, to perform fixed time stepping, call update with the dt parameter.
crowd.update(1 / 60);
To perform fixed time stepping with interpolation, call update with the dt, timeSinceLastCalled, and maxSubSteps parameters.
const dt = 1 / 60;
const timeSinceLastCalled = /* get this from your game loop */;
const maxSubSteps = 10; // optional, default is 10
crowd.update(dt, timeSinceLastCalled, maxSubSteps);
The interpolated position of the agents can be retrieved from agent.interpolatedPosition.
If the old behavior is desired, the following can be done:
const crowd = new Crowd(navMesh);
const targetStepSize = 1 / 60;
const maxSubSteps = 10;
const episilon = 0.001;
const update = (deltaTime: number) => {
if (deltaTime <= Epsilon) {
return;
}
if (targetStepSize <= episilon) {
crowd.update(deltaTime);
} else {
let iterationCount = Math.floor(deltaTime / targetStepSize);
if (iterationCount > maxSubSteps) {
iterationCount = maxSubSteps;
}
if (iterationCount < 1) {
iterationCount = 1;
}
const step = deltaTime / iterationCount;
for (let i = 0; i < iterationCount; i++) {
crowd.update(step);
}
}
};
As part of this change, the maximumSubStepCount, timeStep, and timeFactor Crowd properties have been removed.
89b2d29: feat(CrowdAgent): add desiredVelocity, desiredVelocityObstacleAdjusted
db2aa1b: feat(Crowd): improve 'update' method, add support for fixed time stepping with interpolation
The previous update method did a form of variable time stepping with a target time step.
This has been replaced with a method that supports fixed time stepping, variable time stepping, and fixed time stepping with interpolation.
The new method signature is:
update(dt: number, timeSinceLastCalled?: number, maxSubSteps?: number): void;
To perform a variable sized time step update, call update with the time since the last call.
crowd.update(deltaTime);
Similarly, to perform fixed time stepping, call update with the dt parameter.
crowd.update(1 / 60);
To perform fixed time stepping with interpolation, call update with the dt, timeSinceLastCalled, and maxSubSteps parameters.
const dt = 1 / 60;
const timeSinceLastCalled = /* get this from your game loop */;
const maxSubSteps = 10; // optional, default is 10
crowd.update(dt, timeSinceLastCalled, maxSubSteps);
The interpolated position of the agents can be retrieved from agent.interpolatedPosition.
If the old behavior is desired, the following can be done:
const crowd = new Crowd(navMesh);
const targetStepSize = 1 / 60;
const maxSubSteps = 10;
const episilon = 0.001;
const update = (deltaTime: number) => {
if (deltaTime <= Epsilon) {
return;
}
if (targetStepSize <= episilon) {
crowd.update(deltaTime);
} else {
let iterationCount = Math.floor(deltaTime / targetStepSize);
if (iterationCount > maxSubSteps) {
iterationCount = maxSubSteps;
}
if (iterationCount < 1) {
iterationCount = 1;
}
const step = deltaTime / iterationCount;
for (let i = 0; i < iterationCount; i++) {
crowd.update(step);
}
}
};
As part of this change, the maximumSubStepCount, timeStep, and timeFactor Crowd properties have been removed.
89b2d29: feat(CrowdAgent): add desiredVelocity, desiredVelocityObstacleAdjusted