0d14e5a379
Needs a lot of cleanup. Data has been de-duplicated, and where identical copies existed, one of them has been replaced with a symlink. Some files have been excluded, such as binaries, installers and debug dumps. Some of that may still be present.
100 lines
No EOL
3.7 KiB
JavaScript
100 lines
No EOL
3.7 KiB
JavaScript
//
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// A firefly which is animated by passerbys. It's physical, no gravity, periodic forces applied.
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// If a firefly is found to
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//
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(function () {
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var entityID,
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timeoutID = null,
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properties,
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shouldSimulate = false,
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ACTIVE_CHECK_INTERVAL = 100, // milliseconds
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INACTIVE_CHECK_INTERVAL = 1000, // milliseconds
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MAX_DISTANCE_TO_SIMULATE = 20, // meters
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LIGHT_LIFETIME = 1400, // milliseconds a firefly light will stay alive
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BUMP_SPEED = 1.5, // average velocity given by a bump
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BUMP_CHANCE = 0.33,
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MIN_SPEED = 0.125, // below this speed, firefly gets a new bump
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SPIN_SPEED = 3.5,
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BRIGHTNESS = 0.25,
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wantDebug = false
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function randomVector(size) {
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return { x: (Math.random() - 0.5) * size,
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y: (Math.random() - 0.5) * size,
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z: (Math.random() - 0.5) * size };
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}
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function printDebug(message) {
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if (wantDebug) {
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print(message);
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}
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}
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function maybe() {
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properties = Entities.getEntityProperties(entityID);
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var speed = Vec3.length(properties.velocity);
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var distance = Vec3.distance(MyAvatar.position, properties.position);
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printDebug("maybe: speed: " + speed + ", distance: " + distance);
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if (shouldSimulate) {
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// We are simulating this firefly, so do stuff:
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if (distance > MAX_DISTANCE_TO_SIMULATE) {
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shouldSimulate = false;
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} else if ((speed < MIN_SPEED) && (Math.random() < BUMP_CHANCE)) {
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bump();
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makeLight();
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}
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} else if (Vec3.length(properties.velocity) == 0.0) {
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// We've found a firefly that is not being simulated, so maybe take it over
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if (distance < MAX_DISTANCE_TO_SIMULATE) {
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shouldSimulate = true;
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}
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}
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timeoutID = Script.setTimeout(maybe, (shouldSimulate == true) ? ACTIVE_CHECK_INTERVAL : INACTIVE_CHECK_INTERVAL);
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}
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function bump() {
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// Give the firefly a little brownian hop
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printDebug("bump!");
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var velocity = randomVector(BUMP_SPEED);
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if (velocity.y < 0.0) { velocity.y *= -1.0 };
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Entities.editEntity(entityID, { velocity: velocity,
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angularVelocity: randomVector(SPIN_SPEED) });
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}
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function makeLight() {
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printDebug("make light!");
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// create a light attached to the firefly that lives for a while
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Entities.addEntity({
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type: "Light",
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name: "firefly light",
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intensity: 4.0 * BRIGHTNESS,
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falloffRadius: 8.0 * BRIGHTNESS,
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dimensions: {
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x: 30 * BRIGHTNESS,
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y: 30 * BRIGHTNESS,
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z: 30 * BRIGHTNESS
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},
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position: Vec3.sum(properties.position, { x: 0, y: 0.2, z: 0 }),
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parentID: entityID,
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color: {
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red: 150 + Math.random() * 100,
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green: 100 + Math.random() * 50,
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blue: 150 + Math.random() * 100
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},
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lifetime: LIGHT_LIFETIME / 1000
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});
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}
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this.preload = function (givenEntityID) {
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printDebug("preload firefly...");
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entityID = givenEntityID;
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timeoutID = Script.setTimeout(maybe, ACTIVE_CHECK_INTERVAL);
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};
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this.unload = function () {
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printDebug("unload firefly...");
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if (timeoutID !== undefined) {
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Script.clearTimeout(timeoutID);
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}
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};
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}) |