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Couple of World.step() proposals #392

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Couple of World.step() proposals #392

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f641483
Fixed timestepping happens on timeSinceLastCalled = -1 instead of 0
swift502 Aug 4, 2018
34b2bab
Reset world time accumulator when simulation is limited by maxSubSteps
swift502 Aug 4, 2018
a8c8847
updated builds
swift502 Oct 14, 2018
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30 changes: 24 additions & 6 deletions build/cannon.demo.js
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@ CANNON.Demo = function(options){
shadows: false,
aabbs: false,
profiling: false,
maxSubSteps:3
maxSubSteps: 20
};

// Extend settings with options
Expand Down Expand Up @@ -262,10 +262,20 @@ CANNON.Demo = function(options){

// Read position data into visuals
for(var i=0; i<N; i++){
var b = bodies[i], visual = visuals[i];
visual.position.copy(b.position);
var b = bodies[i],
visual = visuals[i];

// Interpolated or not?
var bodyPos = b.interpolatedPosition;
var bodyQuat = b.interpolatedQuaternion;
if(settings.paused){
bodyPos = b.position;
bodyQuat = b.quaternion;
}

visual.position.copy(bodyPos);
if(b.quaternion){
visual.quaternion.copy(b.quaternion);
visual.quaternion.copy(bodyQuat);
}
}

Expand Down Expand Up @@ -626,8 +636,10 @@ CANNON.Demo = function(options){
} else {
smoothie.start();
}*/
resetCallTime = true;
});
wf.add(settings, 'stepFrequency',60,60*10).step(60);
wf.add(settings, 'stepFrequency',10,60*10).step(10);
wf.add(settings, 'maxSubSteps',1,50).step(1);
var maxg = 100;
wf.add(settings, 'gx',-maxg,maxg).onChange(function(gx){
if(!isNaN(gx)){
Expand Down Expand Up @@ -701,11 +713,12 @@ CANNON.Demo = function(options){
}

var lastCallTime = 0;
var resetCallTime = false;
function updatePhysics(){
// Step world
var timeStep = 1 / settings.stepFrequency;

var now = Date.now() / 1000;
var now = performance.now() / 1000;

if(!lastCallTime){
// last call time not saved, cant guess elapsed time. Take a simple step.
Expand All @@ -715,6 +728,10 @@ CANNON.Demo = function(options){
}

var timeSinceLastCall = now - lastCallTime;
if(resetCallTime){
timeSinceLastCall = 0;
resetCallTime = false;
}

world.step(timeStep, timeSinceLastCall, settings.maxSubSteps);

Expand Down Expand Up @@ -777,6 +794,7 @@ CANNON.Demo = function(options){

case 112: // p
settings.paused = !settings.paused;
resetCallTime = true;
updategui();
break;

Expand Down
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