From dc91443e8cfc3908c55c8ad0988564ae62820822 Mon Sep 17 00:00:00 2001
From: Michael Blix <mkeblx@gmail.com>
Date: Tue, 5 Jul 2016 17:27:56 -0700
Subject: [PATCH] Framerate independent animating for WebVR samples (#9292)

---
 examples/webvr_cubes.html         | 18 +++++++++++-------
 examples/webvr_rollercoaster.html |  8 ++++++--
 examples/webvr_vive.html          |  6 +++++-
 3 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/examples/webvr_cubes.html b/examples/webvr_cubes.html
index 2af86ae6c1..02c89070bc 100644
--- a/examples/webvr_cubes.html
+++ b/examples/webvr_cubes.html
@@ -35,6 +35,8 @@
 
 			//
 
+			var clock = new THREE.Clock();
+
 			var container;
 			var camera, scene, raycaster, renderer;
 			var effect, controls;
@@ -177,6 +179,8 @@
 
 			function render() {
 
+				var delta = clock.getDelta() * 60;
+
 				if ( isMouseDown === true ) {
 
 					var cube = room.children[ 0 ];
@@ -184,9 +188,9 @@
 
 					cube.position.set( 0, 0, - 0.75 );
 					cube.position.applyQuaternion( camera.quaternion );
-					cube.userData.velocity.x = ( Math.random() - 0.5 ) * 0.02;
-					cube.userData.velocity.y = ( Math.random() - 0.5 ) * 0.02;
-					cube.userData.velocity.z = ( Math.random() * 0.01 - 0.05 );
+					cube.userData.velocity.x = ( Math.random() - 0.5 ) * 0.02 * delta;
+					cube.userData.velocity.y = ( Math.random() - 0.5 ) * 0.02 * delta;
+					cube.userData.velocity.z = ( Math.random() * 0.01 - 0.05 ) * delta;
 					cube.userData.velocity.applyQuaternion( camera.quaternion );
 					room.add( cube );
 
@@ -224,7 +228,7 @@
 
 					var cube = room.children[ i ];
 
-					cube.userData.velocity.multiplyScalar( 0.999 );
+					cube.userData.velocity.multiplyScalar( 1 - ( 0.001 * delta ) );
 
 					cube.position.add( cube.userData.velocity );
 
@@ -249,9 +253,9 @@
 
 					}
 
-					cube.rotation.x += cube.userData.velocity.x * 2;
-					cube.rotation.y += cube.userData.velocity.y * 2;
-					cube.rotation.z += cube.userData.velocity.z * 2;
+					cube.rotation.x += cube.userData.velocity.x * 2 * delta;
+					cube.rotation.y += cube.userData.velocity.y * 2 * delta;
+					cube.rotation.z += cube.userData.velocity.z * 2 * delta;
 
 				}
 
diff --git a/examples/webvr_rollercoaster.html b/examples/webvr_rollercoaster.html
index b291f1600f..d7dfa0c13a 100644
--- a/examples/webvr_rollercoaster.html
+++ b/examples/webvr_rollercoaster.html
@@ -204,10 +204,14 @@
 			var velocity = 0;
 			var progress = 0;
 
+			var clock = new THREE.Clock();
+
 			function animate( time ) {
 
 				effect.requestAnimationFrame( animate );
 
+				var delta = clock.getDelta() * 60;
+
 				for ( var i = 0; i < funfairs.length; i ++ ) {
 
 					funfairs[ i ].rotation.y = time * 0.0002;
@@ -216,7 +220,7 @@
 
 				//
 
-				progress += velocity;
+				progress += velocity * delta;
 				progress = progress % 1;
 
 				position.copy( curve.getPointAt( progress ) );
@@ -226,7 +230,7 @@
 
 				tangent.copy( curve.getTangentAt( progress ) );
 
-				velocity -= tangent.y * 0.0000015;
+				velocity -= tangent.y * 0.0000015 * delta;
 				velocity = Math.max( velocity, 0.00004 );
 
 				train.lookAt( lookAt.copy( position ).sub( tangent ) );
diff --git a/examples/webvr_vive.html b/examples/webvr_vive.html
index c374852537..aa89b93235 100755
--- a/examples/webvr_vive.html
+++ b/examples/webvr_vive.html
@@ -38,6 +38,8 @@
 
 			//
 
+			var clock = new THREE.Clock();
+
 			var container;
 			var camera, scene, renderer;
 			var effect, controls;
@@ -226,6 +228,8 @@
 
 			function render() {
 
+				var delta = clock.getDelta() * 60;
+
 				controls.update();
 
 				for ( var i = 0; i < room.children.length; i ++ ) {
@@ -257,7 +261,7 @@
 
 					}
 
-					cube.rotation.x += 0.01;
+					cube.rotation.x += 0.01 * delta;
 
 				}
 
-- 
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