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Fix velocity math error, add random color changes

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Philip Rosedale 2015-05-07 21:05:13 -07:00
parent 5fb79df4c9
commit d3a977d3f8
1 changed files with 20 additions and 12 deletions
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32
examples/harmonicOscillator.js
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@ -16,8 +16,7 @@
var ball, disc;
var time = 0.0;
var range = 1.0;
var speed = 0.5;
var omega = 2.0 * Math.PI / 32.0;
var basePosition = Vec3.sum(Camera.getPosition(), Quat.getFront(Camera.getOrientation()));
@ -25,35 +24,44 @@ ball = Entities.addEntity(
{ type: "Box",
position: basePosition,
dimensions: { x: 0.1, y: 0.1, z: 0.1 },
color: { red: 255, green: 0, blue: 255 }
color: { red: 255, green: 0, blue: 255 },
collisionsWillMove: false,
ignoreForCollisions: true
});
disc = Entities.addEntity(
{ type: "Sphere",
position: basePosition,
dimensions: { x: range, y: range / 20.0, z: range },
dimensions: { x: range * 0.8, y: range / 20.0, z: range * 0.8},
color: { red: 128, green: 128, blue: 128 }
});
function randomColor() {
return { red: Math.random() * 255, green: Math.random() * 255, blue: Math.random() * 255 };
}
function update(deltaTime) {
time += deltaTime * speed;
time += deltaTime;
if (!ball.isKnownID) {
ball = Entities.identifyEntity(ball);
}
rotation = Quat.angleAxis(time/Math.PI * 180.0, { x: 0, y: 1, z: 0 });
rotation = Quat.angleAxis(time * omega /Math.PI * 180.0, { x: 0, y: 1, z: 0 });
Entities.editEntity(ball,
{
color: { red: 255 * (Math.sin(time)/2.0 + 0.5),
green: 255 - 255 * (Math.sin(time)/2.0 + 0.5),
color: { red: 255 * (Math.sin(time * omega)/2.0 + 0.5),
green: 255 - 255 * (Math.sin(time * omega)/2.0 + 0.5),
blue: 0 },
position: { x: basePosition.x + Math.sin(time) / 2.0 * range,
position: { x: basePosition.x + Math.sin(time * omega) / 2.0 * range,
y: basePosition.y,
z: basePosition.z + Math.cos(time) / 2.0 * range },
velocity: { x: Math.cos(time)/2.0 * range,
z: basePosition.z + Math.cos(time * omega) / 2.0 * range },
velocity: { x: Math.cos(time * omega)/2.0 * range * omega,
y: 0.0,
z: -Math.sin(time)/2.0 * range },
z: -Math.sin(time * omega)/2.0 * range * omega},
rotation: rotation
});
if (Math.random() < 0.007) {
Entities.editEntity(disc, { color: randomColor() });
}
}
function scriptEnding() {