Question - How do you change the UserTime in the middle of a game

Rus

I want to change the pace of the animation during the middle of a animation.

I've been fiddling around with the setUserTimeMSec and updateUserTimeMSec functions.
I had no problems with setting the pace of the animation once. But when I need to set it during the middle of a animation, then the animation breaks, ie the Live2d character disappears off the screen.

So my question is: Can you actually change the pace of the animation during the middle of a animation? If yes, how do you do it properly?

This is what I am doing.

var multiplier = 1;

PERIODIC UPDATE FUNCTION:
if(condition){multiplier = 2;}
UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec() * multiplier );

Rus

If you can't understand my question, I will explain my problem like this:

Something like this works fine:

PERIODIC UPDATE FUNCTION:
UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec() * 2); // ie: a constant, and the animation goes twice as fast.

But something like this don't work:

PERIODIC UPDATE FUNCTION:
UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec() * Math.random() ); 

Rus

I am stuck with this trouble. Can someone please help me? Thank you in advance )

Rus

The purpose I ask this is that I want to make an animation that moves faster and faster. (if this makes my question more understand-able)

naotaro

I have tried in Unity.
Motion speed for each model has been changed .

left model(speed:1), right model(speed:5)


However , this function can't be changed dynamically .
I will try to the request to the development team to be additional functions .

Rus

Thank you. I wish I could dynamically slow-down and speed-up animations.

After some trying, I managed to do this (speeding up animation dynamically) :

var Simple = function() {
        ...
	ha.addEventListener("mousedown", function(){
                speed_up_flag1 = false; 
                speed_up_flag = true;
        });
	ha.addEventListener("mouseup", function(){
                speed_up_flag1 = true; 
                speed_up_flag = false;
        });
        ...
};

Simple.draw = function(gl){
        ...
	if(speed_up_flag){
		UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec()*2 );
	}
	if(speed_up_flag1){
		UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec()*3 );	
	}
	
        live2DModel.update(); 
        live2DModel.draw();	
}

HOWEVER, I can't slow down the animation, for example, like this (i.e. setting it to a faster pace, and then setting it to a slower pace) :

	if(speed_up_flag){
		UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec()*3 );
	}
	if(speed_up_flag1){
		UtSystem.setUserTimeMSec( UtSystem.updateUserTimeMSec()*2 );	
	}

If I can dynamically speed up the animation, why can't I dynamically slow it down?

naotaro

I was also able to change the speed by increasing the value .
　1. UtSystem.updateUserTimeMSec() * 2 → OK
　2. UtSystem.updateUserTimeMSec() * 4 → OK
　3. UtSystem.updateUserTimeMSec() * 6 → OK

However , the reverse is impossible .
　1. UtSystem.updateUserTimeMSec() * 6 → OK
　2. UtSystem.updateUserTimeMSec() * 4 → NG
　3. UtSystem.updateUserTimeMSec() * 2 → NG

When you debug the value of updateUserTimeMSec(), time increases .


It can't possibly return the time .
I think that it is not a dynamically changing function of the speed .

Rus

Ok. Thank you