Dom

The real question is, does he deserve a pay cut? Any increase less than or equal to inflation is categorically not a raise.

Hi guys, could anyone point me to a place where I can disambiguate phone charging power standards via direct chat?

yeah I think I've got it figured out in my head, just need to get it accurately into code :)

I'll work on the correcting the velocity calculation anyway, thanks a tonne

That's confusing, what I'm trying to ask is where should I get the new values from to plug into the trajectory mapping function again?

@DMGregory after a collision I run it through the trajectory mapping function again using the new position, angle and velocity. What should the new velocity and angle be calculated from? The angle and position of collision and the remaining velocity we just covered, or from the new end position and an adjusted angle after the collision plus the starting velocity?

that's a working example, not mine

most of it works, but there are some ugly glitches

this is what I'm doing

that was my initial approach, but I dropped it ages ago because it appeared to be wrong, but it's now more likely my calculations were wrong

Thanks a lot, it's good to hear it

actually I have an example of what I'm trying to achieve

the frames occur at various points along the red line inside the boundaries

for example:

does that make sense?

The boundaries are at fixed coordinates (but are relative to the origin for the purposes of the quadratic calculations), and are only hit on the frame when the object will cross them

I'm only working on the axis that the collision occurs on. With the other, I use the standard kinematic equation to find it's next position (I'll probably need to work on that a bit for corners, but only focusing on the main collision for now).

Is this right?

When the collision occurs at 45.35 frames, I take the 0.35. I find the horizontal or vertical distance from the boundary it's heading towards, call it distance. I divide distance by 0.35 and then multiply it by the remainder of the frame (1 - 0.35 = 0.65). So I end up with the remaining portion of distance it should travel.

What I'm doing at the moment is:

@DMGregory yep still not sure about the calculations for the bounce

@DMGregory thanks, I was off to bed when I saw your message. I'm still working on it and would appreciate any help you can offer.

Hi guys, I wonder if anyone could help me work out how to calculate the decay rate for a bouncing ball?

I think I'll have to tweak the magnitudes of my calculations because it can fall as fast as half a screen in a frame

I'd rather it have some base in true physics than just something I make up

first off, does the diagram make sense?

only enough to not notice any problem

ms paints finest

I'll draw a diagram to try and make my misunderstanding clearer

can you shed some light on the direction change?

sorry I'm muddling terms quite a bit, I meant what percentage of the pre-bounce vertical displacement should the post-bounce opposite vertical displacement be x% through a frame, but it appears that you're saying I should be doing the operation on the direction instead?

would it be a third?

what's the relationship please?

@Jimmy so if it happens 75% of the way through the frame, what percentage of the entry velocity would the exit velocity be?

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Is it normal for low-rep users to see comment flags? I got a bunch of chat notifications a minute ago about offensive comments elsewhere and they've disappeared as quickly as they appeared

assuming it's travelling at an angle other than straight down or up

from what I understand, the projectile will be at the same vertical displacement after the bounce but a different horizontal displacement?

essentially, I only need the horizontal velocity at the time of the collision multiplied by two

@Jimmy I think that'll be something to implement at the next stage

Thanks a lot!

Does that sound right?

ahaaa! I think I see my problem. The exit velocity should be equal to the entry velocity, not the remainder of velocity left for the frame minus the entry velocity.

@Jimmy So would this be one frame of the projectile at the boundary and another at the reflected position?

@Jimmy yeah I have the exact time.

@Jimmy It's a browser canvas based animation and my rendering engine is extremely basic. Just a function that calls x times per second using setTimeout. Does that affect the possibility of using 2 timesteps?

@Jimmy The best assumption I can make at the moment is that I'm not reducing it's velocity at all based on the bounce when I should be