95 lines
2.7 KiB
JavaScript
95 lines
2.7 KiB
JavaScript
//
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// flickeringLight.js
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// examples
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//
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// Created by Brad Hefta-Gaub on 2015/09/29.
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// Copyright 2015 High Fidelity, Inc.
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//
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// Creates an ephemeral flickering light that will randomly flicker as long as the script is running.
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// After the script stops running, the light will eventually disappear (~10 seconds later). This script
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// can run in the interface or in an assignment client and it will work equally well.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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function randFloat(low, high) {
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return low + Math.random() * (high - low);
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}
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var LIGHT_NAME = "flickering fire";
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var LIGHT_POSITION = {
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x: 1101.7900390625,
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y: 460.2709045410156,
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z: -78.48441314697266
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};
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var LIGHT_COLOR = {
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red: 194,
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green: 50 ,
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blue: 194
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};
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var ZERO_VEC = {
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x: 0,
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y: 0,
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z: 0
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};
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var totalTime = 0;
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var lastUpdate = 0;
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var UPDATE_INTERVAL = 1 / 30; // 30fps
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var MINIMUM_LIGHT_INTENSITY = 1;
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var MAXIMUM_LIGHT_INTENSITY = 3;
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var LIGHT_FALLOFF_RADIUS = 10;
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var LIGHT_INTENSITY_RANDOMNESS = 0.1;
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var EPHEMERAL_LIFETIME = 60; // ephemeral entities will live for 60 seconds after script stops running
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var LightMaker = {
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light: null,
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spawnLight: function() {
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print('CREATING LIGHT')
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var _this = this;
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_this.light = Entities.addEntity({
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type: "Light",
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name: LIGHT_NAME,
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position: LIGHT_POSITION,
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lifetime: EPHEMERAL_LIFETIME,
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color: LIGHT_COLOR,
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dimensions: { x: 21, y: 21, z: 21 },
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falloffRadius: 10
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});
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}
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}
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var hasSpawned = false;
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function update(deltaTime) {
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if (!Entities.serversExist() || !Entities.canRez()) {
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return;
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}
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if (hasSpawned === false) {
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hasSpawned = true;
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LightMaker.spawnLight();
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} else {
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totalTime += deltaTime;
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// We don't want to edit the entity EVERY update cycle, because that's just a lot
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// of wasted bandwidth and extra effort on the server for very little visual gain
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if (totalTime - lastUpdate > UPDATE_INTERVAL) {
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var intensity = (MINIMUM_LIGHT_INTENSITY + (MAXIMUM_LIGHT_INTENSITY + (Math.sin(totalTime) * MAXIMUM_LIGHT_INTENSITY)));
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intensity += randFloat(-LIGHT_INTENSITY_RANDOMNESS, LIGHT_INTENSITY_RANDOMNESS);
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var properties = Entities.getEntityProperties(LightMaker.light, "age");
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var newLifetime = properties.age + EPHEMERAL_LIFETIME;
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Entities.editEntity(LightMaker.light, { type: "Light", intensity: intensity, lifetime: newLifetime });
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lastUpdate = totalTime;
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}
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}
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}
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Script.update.connect(update);
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