Skip to content

Frame rate independent damping #27

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
tigrouind wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Frame rate independent damping #27

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
31 changes: 12 additions & 19 deletions wipeout.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ var Wipeout = function(containerId, width, height){
this.width = width;
this.height = height;

this.previousTime = 0;
this.activeCameraMode = 'fly';

window.addEventListener('resize', this.resize.bind(this), true);
Expand Down Expand Up @@ -39,8 +40,7 @@ Wipeout.prototype.clear = function() {
this.trackMaterial = null;
this.weaponTileMaterial = null;

this.startTime = Date.now();
this.ticks = 0;

};

Wipeout.prototype.resize = function() {
Expand All @@ -56,9 +56,8 @@ Wipeout.prototype.resize = function() {
this.renderer.setSize( window.innerWidth, window.innerHeight );
}

Wipeout.prototype.animate = function() {
Wipeout.prototype.animate = function(time) {
requestAnimationFrame( this.animate.bind(this) );
var time = Date.now();

// Update weapon tile color
if(this.weaponTileMaterial) {
Expand All @@ -68,16 +67,11 @@ Wipeout.prototype.animate = function() {
// Camera is in fly mode and we have a spline to follow?
if( this.activeCameraMode === 'fly' && this.cameraSpline ) {

var elapsedTime = time - this.startTime;
var elapsedTicks = elapsedTime / 1000 * 60;
var deltaTime = time - this.previousTime;
this.previousTime = time;

// Fixed time step loop (60hz)
while(this.ticks < elapsedTicks) {

this.updateSplineCamera();
this.ticks++;
}

this.updateSplineCamera(time, deltaTime);

this.rotateSpritesToCamera(this.splineCamera);
this.renderer.render(this.scene, this.splineCamera);
}
Expand All @@ -90,10 +84,9 @@ Wipeout.prototype.animate = function() {
}
};

Wipeout.prototype.updateSplineCamera = function() {
var damping = 0.90;
var time = this.ticks * 1000 / 60;

Wipeout.prototype.updateSplineCamera = function(time, deltaTime) {
// Framerate independent damping
var damping = Math.pow(0.90, deltaTime * 60 / 1000);
var loopTime = this.cameraSpline.points.length * 100;

// Camera position along the spline
Expand All @@ -119,14 +112,14 @@ Wipeout.prototype.updateSplineCamera = function() {
? -Math.PI*2
: (roll < -Math.PI) ? Math.PI * 2 : 0;

this.splineCamera.roll = this.splineCamera.roll * 0.95 + (roll)*0.1;
damping = Math.pow(0.95, deltaTime * 60 / 1000);
this.splineCamera.roll = this.splineCamera.roll * damping + (roll)*(1-damping);
this.splineCamera.up = (new THREE.Vector3(0,1,0)).applyAxisAngle(
this.splineCamera.position.clone().sub(this.splineCamera.currentLookAt).normalize(),
this.splineCamera.roll * 0.25
);
}


Wipeout.prototype.rotateSpritesToCamera = function(camera) {
for( var i = 0; i < this.sprites.length; i++ ) {
this.sprites[i].rotation.y = camera.rotation.y;
Expand Down