What's the best way to handle slopes for a platfomer game using Box2D

Question

I would like to know if there is any known solution for handling the player's movement on slopes using Box2D engine.

I tried to do it using a circle as the player. Everything was fine until I tried to walk on slopes, the main problem is that due to gravity, the circle does not stop on the slope.

Please if somebody has tried this before I'll appreciate it. If you have a better solution without the physics engine would be fine for me too.

Thank you.

Try reducing the friction or rotational velocity of the player to zero. — tesselode, Oct 16 '12 at 23:18
possible duplicate of Make player to always move along the terrain — House, Oct 17 '12 at 00:32
@Byte56 The question you linked to is to prevent a hop at the top of the ramp. There isn't any overlap. — ClassicThunder, Oct 17 '12 at 02:06
@ClassicThunder OK. They seemed pretty similar to me. It is only a possible duplicate after all :) — House, Oct 17 '12 at 03:02
I'll try this too and will let you know the results, thanks. — songokuhd, Oct 17 '12 at 14:09

score 2 · Answer 1 · answered Oct 17 '12 at 04:04

Behind boxboy by Robert Dodd describes a very sensible method for making a character in box2d that plays like a more traditional platformer character.

The main components is the anglejoint as well as a fixed speed motor joint. With enough friction your character will not slide down slopes, and as long as the motor is active it would keep it from rolling downhill. I'm uncertain exactly how, but you should be able to keep the motor engaged even when its not rotating, to prevent the circle from rolling freely.

Thank you!, I'll try this and post my results back here for you to know. — songokuhd, Oct 17 '12 at 14:05

score -1 · Answer 2 · edited Sep 01 '15 at 14:48

-1

You could raycast to judge whether the character is standing on a slope and modify their velocity accordingly.

edited Sep 01 '15 at 14:48

Anko

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answered Sep 01 '15 at 05:12

FengYi Ya

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Could you go into a little more detail on how and why this would work? – Anko Sep 01 '15 at 14:49
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@Anko he would have to modify this one as well. :P – Vaillancourt Sep 01 '15 at 14:54

What's the best way to handle slopes for a platfomer game using Box2D

2 Answers2