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497 lines
14 KiB
JavaScript
497 lines
14 KiB
JavaScript
//
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// solarsystem.js
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// example
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//
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// Created by Bridget Went, 5/28/15.
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// Copyright 2015 High Fidelity, Inc.
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//
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// A project to build a virtual physics classroom to simulate the solar system, gravity, and orbital physics.
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//
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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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CreateSimulation = function() {
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Script.include("https://hifi-public.s3.amazonaws.com/eric/scripts/tween.js");
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Script.include('games/satellite.js');
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var trailsEnabled = this.trailsEnabled = true;
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var DAMPING = this.DAMPING = 0.0;
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var LIFETIME = this.LIFETIME = 6000;
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var BASE_URL = this.BASE_URL = "https://s3.amazonaws.com/hifi-public/marketplace/hificontent/Scripts/planets/planets/";
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// Save intiial avatar and camera position
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var startingPosition = this.startingPosition = {
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x: 8000,
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y: 8000,
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z: 8000
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};
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MyAvatar.position = startingPosition;
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var cameraStart = this.cameraStart = Camera.getOrientation();
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// Place the sun
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var MAX_RANGE = this.MAX_RANGE = 100.0;
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var center = this.center = Vec3.sum(startingPosition, Vec3.multiply(MAX_RANGE, Vec3.normalize(Quat.getFront(Camera.getOrientation()))));
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var SUN_SIZE = this.SUN_SIZE = 7.0;
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var theSun = this.theSun = Entities.addEntity({
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type: "Model",
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modelURL: BASE_URL + "sun.fbx",
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position: center,
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dimensions: {
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x: SUN_SIZE,
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y: SUN_SIZE,
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z: SUN_SIZE
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},
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angularVelocity: {
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x: 0.0,
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y: 0.1,
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z: 0.0
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},
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angularDamping: DAMPING,
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damping: DAMPING,
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ignoreCollisions: false,
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lifetime: LIFETIME,
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dynamic: false
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});
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// Reference values for physical constants
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var referenceRadius = this.referenceRadius = 15.0;
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var referenceDiameter = this.referenceDiameter = 0.6;
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var referencePeriod = this.referencePeriod = 3.0;
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var LARGE_BODY_MASS = this.LARGE_BODY_MASS = 250.0;
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var SMALL_BODY_MASS = this.SMALL_BODY_MASS = LARGE_BODY_MASS * 0.000000333;
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var GRAVITY = this.GRAVITY = (Math.pow(referenceRadius, 3.0) / Math.pow((referencePeriod / (2.0 * Math.PI)), 2.0)) / LARGE_BODY_MASS;
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var REFERENCE_GRAVITY = this.REFERENCE_GRAVITY = GRAVITY;
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var planets = this.planets = [];
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var MAX_POINTS_PER_LINE = this.MAX_POINTS_PER_LINE = 40;
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var LINE_DIM = this.LINE_DIM = 200;
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var LINE_WIDTH = this.LINE_WIDTH = 20;
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var VELOCITY_OFFSET_Y = this.VELOCITY_OFFSET_Y = -0.3;
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var VELOCITY_OFFSET_Z = this.VELOCITY_OFFSET_Z = 0.9;
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var index = this.index = 0;
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this.computeLocalPoint = function(linePos, worldPoint) {
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var localPoint = Vec3.subtract(worldPoint, linePos);
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return localPoint;
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}
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// Create a new line
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this.newLine = function(lineStack, point, period, color) {
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if (elapsed < period) {
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var line = Entities.addEntity({
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position: point,
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type: "Line",
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color: color,
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dimensions: {
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x: LINE_DIM,
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y: LINE_DIM,
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z: LINE_DIM
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},
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lifetime: LIFETIME,
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lineWidth: LINE_WIDTH
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});
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lineStack.push(line);
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} else {
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// Begin overwriting first lines after one full revolution (one period)
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var firstLine = lineStack.shift();
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Entities.editEntity(firstLine, {
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position: point,
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linePoints: [{
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x: 0.0,
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y: 0.0,
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z: 0.0
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}]
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});
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lineStack.push(firstLine);
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}
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var points = [];
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points.push(computeLocalPoint(point, point));
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return points;
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}
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this.pause = function() {
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if (paused) {
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return;
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}
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for (var i = 0; i < planets.length; ++i) {
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Entities.editEntity(planets[i].planet, {
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velocity: {
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x: 0.0,
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y: 0.0,
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z: 0.0
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}
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});
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planets[i].label = new PlanetLabel(planets[i].name, i);
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planets[i].label.show();
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}
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paused = true;
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}
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this.resume = function() {
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if (!paused) {
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return;
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}
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for (var i = 0; i < planets.length; ++i) {
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planets[i].label.hide();
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}
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paused = false;
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}
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var Planet = function(name, trailColor, radiusScale, sizeScale) {
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this.name = name;
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this.trailColor = trailColor;
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this.trail = [];
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this.lineStack = [];
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this.radius = radiusScale * referenceRadius;
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this.position = Vec3.sum(center, {
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x: this.radius,
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y: 0.0,
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z: 0.0
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});
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this.startPosition = this.position;
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this.period = (2.0 * Math.PI) * Math.sqrt(Math.pow(this.radius, 3.0) / (GRAVITY * LARGE_BODY_MASS));
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this.initialVelocity = Math.sqrt((GRAVITY * LARGE_BODY_MASS) / this.radius);
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this.velocity = Vec3.multiply(this.initialVelocity, Vec3.normalize({
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x: 0,
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y: VELOCITY_OFFSET_Y,
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z: VELOCITY_OFFSET_Z
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}));
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this.dimensions = sizeScale * referenceDiameter;
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this.sizeScale = sizeScale;
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this.planet = Entities.addEntity({
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type: "Model",
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modelURL: BASE_URL + name + ".fbx",
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position: this.position,
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dimensions: {
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x: this.dimensions,
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y: this.dimensions,
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z: this.dimensions
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},
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velocity: this.velocity,
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angularDamping: DAMPING,
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damping: DAMPING,
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ignoreCollisions: false,
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lifetime: LIFETIME,
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dynamic: false,
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});
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this.computeAcceleration = function() {
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var acc = -(GRAVITY * LARGE_BODY_MASS) * Math.pow(this.radius, (-2.0));
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return acc;
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};
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this.update = function(deltaTime) {
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var between = Vec3.subtract(this.position, center);
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var speed = this.computeAcceleration(this.radius) * deltaTime;
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var vel = Vec3.multiply(speed, Vec3.normalize(between));
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// Update velocity and position
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this.velocity = Vec3.sum(this.velocity, vel);
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this.position = Vec3.sum(this.position, Vec3.multiply(deltaTime, this.velocity));
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Entities.editEntity(this.planet, {
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velocity: this.velocity,
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position: this.position
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});
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if (trailsEnabled) {
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this.updateTrail();
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}
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};
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this.clearTrails = function() {
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elapsed = 0.0;
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for (var j = 0; j < this.lineStack.length; ++j) {
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Entities.editEntity(this.lineStack[j], {
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visible: false
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});
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}
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}
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this.resetTrails = function() {
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elapsed = 0.0;
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this.trail = [];
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this.lineStack = [];
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//add the first line to both the line entity stack and the trail
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this.trail.push(newLine(this.lineStack, this.position, this.period, this.trailColor));
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};
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this.updateTrail = function() {
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var point = this.position;
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var linePos = Entities.getEntityProperties(this.lineStack[this.lineStack.length - 1]).position;
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this.trail.push(computeLocalPoint(linePos, point));
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Entities.editEntity(this.lineStack[this.lineStack.length - 1], {
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linePoints: this.trail
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});
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if (this.trail.length == MAX_POINTS_PER_LINE) {
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this.trail = newLine(this.lineStack, point, this.period, this.trailColor);
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}
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};
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this.zoom = function() {
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if (!paused) {
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pause();
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}
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this.tweening = true;
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var tweenTime = 1000;
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var startingPosition = MyAvatar.position;
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var endingPosition = Vec3.sum({
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x: 0,
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y: 0,
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z: this.sizeScale
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}, this.position);
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var currentProps = {
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x: startingPosition.x,
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y: startingPosition.y,
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z: startingPosition.z,
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};
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var endProps = {
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x: endingPosition.x,
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y: endingPosition.y,
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z: endingPosition.z,
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};
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var moveTween = new TWEEN.Tween(currentProps).
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to(endProps, tweenTime).
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easing(TWEEN.Easing.Cubic.InOut).
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onUpdate(function() {
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MyAvatar.position = {
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x: currentProps.x,
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y: currentProps.y,
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z: currentProps.z
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};
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}).start();
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moveTween.onComplete(function() {
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Camera.lookAt(endingPosition);
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this.tweening = false;
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});
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}
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index++;
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this.resetTrails();
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}
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var MERCURY_LINE_COLOR = {
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red: 255,
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green: 255,
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blue: 255
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};
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var VENUS_LINE_COLOR = {
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red: 255,
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green: 160,
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blue: 110
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};
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var EARTH_LINE_COLOR = {
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red: 10,
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green: 150,
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blue: 160
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};
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var MARS_LINE_COLOR = {
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red: 180,
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green: 70,
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blue: 10
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};
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var JUPITER_LINE_COLOR = {
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red: 250,
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green: 140,
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blue: 0
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};
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var SATURN_LINE_COLOR = {
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red: 235,
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green: 215,
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blue: 0
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};
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var URANUS_LINE_COLOR = {
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red: 135,
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green: 205,
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blue: 240
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};
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var NEPTUNE_LINE_COLOR = {
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red: 30,
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green: 140,
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blue: 255
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};
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var PLUTO_LINE_COLOR = {
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red: 255,
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green: 255,
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blue: 255
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};
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this.initPlanets = function() {
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planets.push(new Planet("mercury", MERCURY_LINE_COLOR, 0.387, 0.383));
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planets.push(new Planet("venus", VENUS_LINE_COLOR, 0.723, 0.949));
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planets.push(new Planet("earth", EARTH_LINE_COLOR, 1.0, 1.0));
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planets.push(new Planet("mars", MARS_LINE_COLOR, 1.52, 0.532));
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planets.push(new Planet("jupiter", JUPITER_LINE_COLOR, 5.20, 11.21));
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planets.push(new Planet("saturn", SATURN_LINE_COLOR, 9.58, 9.45));
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planets.push(new Planet("uranus", URANUS_LINE_COLOR, 19.20, 4.01));
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planets.push(new Planet("neptune", NEPTUNE_LINE_COLOR, 30.05, 3.88));
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planets.push(new Planet("pluto", PLUTO_LINE_COLOR, 39.48, 0.186));
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}
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initPlanets();
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var LABEL_X = 8.0;
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var LABEL_Y = 3.0;
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var LABEL_Z = 1.0;
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var LABEL_DIST = 8.0;
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var TEXT_HEIGHT = 1.0;
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var PlanetLabel = function(name, index) {
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var text = name + " Speed: " + Vec3.length(planets[index].velocity).toFixed(2);
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this.labelPos = Vec3.sum(planets[index].position, {
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x: 0.0,
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y: LABEL_DIST,
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z: LABEL_DIST
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});
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this.linePos = planets[index].position;
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this.line = Entities.addEntity({
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type: "Line",
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position: this.linePos,
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dimensions: {
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x: 20,
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y: 20,
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z: 20
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},
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lineWidth: LINE_WIDTH,
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color: {
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red: 255,
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green: 255,
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blue: 255
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},
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linePoints: [{
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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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computeLocalPoint(this.linePos, this.labelPos)
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],
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visible: false
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});
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this.label = Entities.addEntity({
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type: "Text",
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text: text,
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lineHeight: TEXT_HEIGHT,
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dimensions: {
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x: LABEL_X,
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y: LABEL_Y,
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z: LABEL_Z
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},
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position: this.labelPos,
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backgroundColor: {
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red: 10,
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green: 10,
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blue: 10
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},
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faceCamera: true,
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visible: false
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});
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this.show = function() {
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this.showing = true;
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Entities.editEntity(this.line, {
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visible: true
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});
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Entities.editEntity(this.label, {
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visible: true
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});
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}
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this.hide = function() {
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this.showing = false;
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Entities.editEntity(this.line, {
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visible: false
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});
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Entities.editEntity(this.label, {
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visible: false
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});
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}
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}
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var planetLines = [];
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var trails = this.trails = [];
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var paused = this.paused = false;
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var time = 0;
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var elapsed;
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var TIME_STEP = 80;
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this.update = function(deltaTime) {
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for (var i = 0; i < planets.length; ++i) {
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if (paused) {
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return;
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}
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planets[i].update(deltaTime);
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}
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time++;
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if (time % TIME_STEP == 0) {
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elapsed++;
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}
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}
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Script.include('planets-ui.js');
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// Clean up models, UI panels, lines, and button overlays
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this.scriptEnding = function() {
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Entities.deleteEntity(theSun);
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for (var i = 0; i < planets.length; ++i) {
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Entities.deleteEntity(planets[i].planet);
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}
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var e = Entities.findEntities(MyAvatar.position, 10000);
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for (i = 0; i < e.length; i++) {
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var props = Entities.getEntityProperties(e[i]);
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if (props.type === "Line" || props.type === "Text") {
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Entities.deleteEntity(e[i]);
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}
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}
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};
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this.restart = function() {
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if (paused) {
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resume();
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}
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for (var i = 0; i < planets.length; ++i) {
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Entities.deleteEntity(planets[i].planet);
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planets[i].clearTrails();
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}
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time = 0.0;
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elapsed = 0.0;
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planets.length = 0;
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initPlanets();
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MyAvatar.position = startingPosition;
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Camera.setPosition(cameraStart);
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};
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}
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CreateSimulation();
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Script.update.connect(update);
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Script.scriptEnding.connect(scriptEnding);
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