ball physics help?

[GoGoTauren]

so, im working on a minigame that has a ball, and im just looking for a way to make it rebound off walls. The ball movement is 2D, it doesnt use the Z axis at all.

 

[M0RT]

And walls are just cliffs, or do you also have angled walls?

If it's just cliffs, really simple, for X-walls (all points have same X coordinate), revert X coordinte of the ball movement, for Y-walls revert y movement (by reverting I mean switching from - to +, or otherwise)

 

[uberfoop]

Also, if the walls aren't all perpendicular to each other, there's still a fairly easy way to determine some rebound angle "C" given the angle of the wall "A" and the angle of the ball's motion "B".

C = 2A - B

It works fine whether the angle is measured in degrees or radians, positive or negative, and in any range (ie -630 instead of 90 degrees). However, it's also possible and easy for it to return values outside of the normal ranges (such as -630 instead of 90), so you could always do something like Mod(Angle,360) if you want to keep it within the normal range.

 

[GoGoTauren]

im using a cliff, but polar projections so I'll do what uberfoop mentioned. just wondering, what do you guys think is the best thing to use as an event? and to detect the angle of the wall...

 

[Crazed_seal2]

IDK but this might work. But idk if it is true...

Theorie ONLY

Made in MSPaint

 

[GoGoTauren]

yeah that's basically uberfoop's theory '

offtopic: in paint i can make the Mona Lisa look like Dumbledore

 

[MortAr]

im using a cliff, but polar projections so I'll do what uberfoop mentioned. just wondering, what do you guys think is the best thing to use as an event? and to detect the angle of the wall...

Detect when the specified 'ball' unit takes damage, also I keep an old bouncing system on my PC, if you would like to see it, I can share it with you.

 

[GoGoTauren]

hmm i'll do that for when it's being attacked... can i see the bouncing system please?

 

[MortAr]

It's not done by me, but there's a readme.

PS: I was playing around with it sometime ago and the results was perfect.

 

[GoGoTauren]

its awesome, thanks