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added ability to follow/fly with the birds

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Philip Rosedale 2015-07-21 12:18:52 -07:00
parent 45a229494b
commit 6c51c9e950
1 changed files with 63 additions and 4 deletions
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67
examples/FlockOfbirds.js
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@ -10,8 +10,7 @@
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
// The area over which the birds will fly
// The rectangular area in the domain where the flock will fly
var lowerCorner = { x: 0, y: 0, z: 0 };
var upperCorner = { x: 10, y: 10, z: 10 };
var STARTING_FRACTION = 0.25;
@ -37,6 +36,10 @@ var ALIGNMENT_FORCE = 1.5;
var COHESION_FORCE = 1.0;
var MAX_COHESION_VELOCITY = 0.5;
var followBirds = true;
var AVATAR_FOLLOW_RATE = 0.001;
var AVATAR_FOLLOW_VELOCITY_TIMESCALE = 2.0;
var AVATAR_FOLLOW_ORIENTATION_RATE = 0.005;
var floor = false;
var MAKE_FLOOR = false;
@ -45,6 +48,9 @@ var averagePosition = { x: 0, y: 0, z: 0 };
var birdsLoaded = false;
var oldAvatarOrientation;
var oldAvatarPosition;
var birds = [];
var playing = [];
@ -52,6 +58,42 @@ function randomVector(scale) {
return { x: Math.random() * scale - scale / 2.0, y: Math.random() * scale - scale / 2.0, z: Math.random() * scale - scale / 2.0 };
}
vecToPolar = function(direction) {
var epsilon = 0.001;
var DEGREES_TO_RADIANS = Math.PI / 180.0;
var RADIANS_TO_DEGREES = 180.0 / Math.PI;
var x = direction.x;
var y = direction.y;
var z = direction.z;
var pitch, yaw;
pitch = -Math.asin(y);
var c = Math.cos(-pitch);
if (Math.abs(pitch) > (Math.PI / 2.0 - epsilon)) {
//handle gymbal lock
if (pitch > 0) {
pitch = Math.PI / 2.0;
} else {
pitch = -Math.PI / 2.0;
}
yaw = 0.0;
} else {
if (z < 0) {
if(x > 0 && x < 1) {
yaw = Math.PI - Math.asin(x / c);
} else {
yaw = -Math.asin(x / c) - Math.PI;
}
} else {
yaw = Math.asin(x / c);
}
}
return {
x: pitch * RADIANS_TO_DEGREES,
y: yaw * RADIANS_TO_DEGREES,
z: 0.0 //discard roll component
};
};
function updateBirds(deltaTime) {
if (!Entities.serversExist() || !Entities.canRez()) {
return;
@ -169,10 +211,24 @@ function updateBirds(deltaTime) {
if (birdVelocitiesCounted > 0) {
averageVelocity = Vec3.multiply(1.0 / birdVelocitiesCounted, sumVelocity);
//print(Vec3.length(averageVelocity));
if (followBirds) {
MyAvatar.motorVelocity = averageVelocity;
MyAvatar.motorTimescale = AVATAR_FOLLOW_VELOCITY_TIMESCALE;
var polarAngles = vecToPolar(Vec3.normalize(averageVelocity));
if (!isNaN(polarAngles.x) && !isNaN(polarAngles.y)) {
var birdDirection = Quat.fromPitchYawRollDegrees(polarAngles.x, polarAngles.y + 180, polarAngles.z);
MyAvatar.orientation = Quat.mix(MyAvatar.orientation, birdDirection, AVATAR_FOLLOW_ORIENTATION_RATE);
}
}
}
if (birdPositionsCounted > 0) {
averagePosition = Vec3.multiply(1.0 / birdPositionsCounted, sumPosition);
// If Following birds, update position
if (followBirds) {
MyAvatar.position = Vec3.sum(Vec3.multiply(AVATAR_FOLLOW_RATE, MyAvatar.position), Vec3.multiply(1.0 - AVATAR_FOLLOW_RATE, averagePosition));
}
}
}
// Connect a call back that happens every frame
@ -186,11 +242,14 @@ Script.scriptEnding.connect(function() {
if (floor) {
Entities.deleteEntity(floor);
}
MyAvatar.orientation = oldAvatarOrientation;
MyAvatar.position = oldAvatarPosition;
});
function loadBirds(howMany) {
while (!Entities.serversExist() || !Entities.canRez()) {
}
oldAvatarOrientation = MyAvatar.orientation;
oldAvatarPosition = MyAvatar.position;
var sound_filenames = ["bushtit_1.raw", "bushtit_2.raw", "bushtit_3.raw"];
/* Here are more sounds/species you can use
, "mexicanWhipoorwill.raw",