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Can't stop character sliding down slope — Gideros Forum
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    Can't stop character sliding down slope

    Tom2012Tom2012 Guru
    edited December 2012 in General questions
    Hi all,

    I'm using Box2D for my platform game. Everything works well except for when the character is on a slope. I can't seem to stop the body from sliding down the slope when the character is stationary on a slope.

    Has anyone had any luck with this? I've been mining google with no luck yet.

    Dislikes: MauMau

    Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
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    Comments

    • twisttaptwisttap Member
      Maybe you can apply a force like, character Mass * -gravity
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    • twisttaptwisttap Member
      edited December 2012
      Or better idea, reset the gravityScale to zero when on a slope.
      From guiders ref I -> gravityScale: (number) Scale the gravity applied to this body.
      b2.Body:setGravityScale(scale)
      might work for you :)
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    • Tom2012Tom2012 Guru
      Thanks Twisttap

      The problem with the gravity scale is that if you then touch say left and the character begins to run down hill, he sort of hovers in the air until enough gravity has built up to push him back down to the slope.

      Unless I've got something wrong.

      The next thing I'll try is applying my own gravity each frame, which can then be turned off by setting the y factor in the setLinearVelocity
      Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
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    • ar2rsawseenar2rsawseen Maintainer
      How about friction of character or slope, can you increase it?
      http://appcodingeasy.com/Gideros-Mobile
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    • twisttaptwisttap Member
      edited December 2012
      Cant you check if the char is moving right or left then apply a if statement :/
      Found something like that, not lua but its very easy to adopt.
      -(void) onSlope
{
    b2Vec2 current = body->GetLinearVelocity();
 
    if (moving && direction == kDirectionLeft) {
        body->SetGravityScale(1.0f);
        body->SetLinearVelocity(b2Vec2(-HORIZONTAL_SPEED, current.y));
 
    } else if (moving && direction == kDirectionRight) {
        body->SetGravityScale(1.0f);
        body->SetLinearVelocity(b2Vec2(HORIZONTAL_SPEED, current.y));
 
    } else {
        body->SetGravityScale(0.0f);
        body->SetLinearVelocity(b2Vec2(0, current.y));
    }
}
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    • Tom2012Tom2012 Guru
      edited December 2012
      Thanks guys, I've found something that works. Whatever I tried gravity is being applied to the body and is forcing it down the slope.

      The solution is a bit ugly but it seems to work...
      	if(self.scene.hero.onSlope and #self.scene.leftButtonTouches==0 and #self.scene.rightButtonTouches==0) then
 
		-- make this adjustment to stop hero sliding down slopes
		self.yVel = -.5
 
	end
      ... then set the y component in the setLinearVelocity
      Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
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    • hgvyas123hgvyas123 Guru
      Accepted Answer
      @Tom2012

      can you try setLinearDamping with very high value when you want to freeze the character and reset it when you want to move

      :)

      Likes: Tom2012

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    • Tom2012Tom2012 Guru
      Ah thanks hgvyas123

      That solved the problem.

      It's so funny when you find the solution and it's so straight forward. I must have spent hours fiddling around with code.

      Much appreciated. :-)
      Lost Caverns - my little game on Play Store - https://play.google.com/store/apps/details?id=com.firecroc.lostcaverns
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    • hgvyas123hgvyas123 Guru
      welcome


      :)
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