Box2D Forums

Does anyone know of a quick hack for 2.1a to fix the wheel bounce at high speeds when driving over boxes of exactly the same elevation/dimensions? I don't know how to convert the Box2D 2.2 edge code to AS3.

That edge catching bug is a big problem. It makes it so you can't have high speed vehicles. I can't use chain shapes because everything in the game is built out of boxes and triangles.

Another thought... Maybe reduce the hit area of each box side to 99.5% so it doesn't occur. Any thoughts?

Unfortunately that's more than just a quick hack...
If the boxes are part of a larger (tiled?) terrain then maybe you could give them extra edges so that they slope more gradually upwards... this is gonna need a picture:

Although that wouldn't be so quick, I believe it fulfills the 'hack' requirement
But I'm guessing that if you could mess around with your shapes this easily, then you would be using larger ones instead of many small boxes in the first place?

Ohhh, genius... That should work. Good drawing, but the real implementation should only need like a 3 pixel slope and not as much length. Will test this hack and tune it in.

In my tiling engine I will put this in and try it out...
Psedocode:
if (this tile has a tile to the left and right of the same elevation){
use sloped edge box shape
} else {
use normal square box shape
}

And I probably should add right sloped and left sloped boxes too for platform ends... This fix is a piece of cake if it works.

Yep, worked like a charm... Thanks man!

However, in order to get it to work perfectly I had to extend the ramp section sideways 95% across each block on each side, and the ramp section seems optimal at 1.5 pixels height with 95pixels in length... Talk about a shallow ramp! LoL...

Cool! Actually I didn't think it would work too well but this is very similar to the 'ghost' segments that b2EdgeShapes have to prevent things from catching on them, so I thought it might be worth a try.