Delta Time Issue

Questions
#1

Hello,

I am new around here, I started working with Defold a few days ago and impressed with my experience so far. I have decided to work through the tutorial to get a better feel for the elements involved with putting a game together.

Everything was well until the end of section 5 when I came to test my parallax scrolling background and my character running animation.

Firstly I was to set the background scrolling speed to 6, then setting my characters jump take off speed to 900 and a gravity value of -20. The background scrolls that fast it is a blur and my character won’t leave the ground when jumping unless I increase the jump speed to some value greater than 5000.

I thought I would try the plat-former game which was provided, that too also ran extremely quick, which got me looking into the delta time of the update function. I noticed in Defold Editor 2 the Dt variable is not set by default for this project and after ticking it, it resolved my issues with the plat-former demo.

After rushing back to my project I was only disappointed to find out that was not the issue I was experiencing there.

If anyone should shed some light on the issue or let me know what information they require to assist me that would be great.

Thanks.

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#2

There’s a known issue with the engine on Windows (only?) where certain gfx drivers misbehave and run faster than specified. I believe we started looking into this a while back (@Johan_Beck-Noren?) but I can’t remember what we came up with.

But just to be clear: You’re moving things in update() and you use the dt to adjust the distance you move things?

#3

Apologies for the delayed response. I am actually using Linux but I believe the issue was with the tutorial itself. It does not actually implement dt within any update function of the ground script.

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#4

Ah, yes, you’re right, the tutorial doesn’t make use of delta time. @sicher, surely that’s something we could improve on?

So, the solution would be to increase self.speed and then do:

pos.x = pos.x - self.speed * dt
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