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Question by Razputin · Apr 09, 2021 at 02:11 AM · physicsrigidbodyaddforceslope

Prevent Rigidbody from Shooting Off Slopes

I've seen a couple posts about this but I don't think I can implement them into my movement system.

Does anyone have a good solution for this?

Here is how I'm moving currently, it keeps the character on the ground when walking up/down slopes, but sometimes I still shoot off at the crest of slopes, since I'm adding force to the X-Axis.

Code (CSharp):

         bool downHill = (straffe >= 0 && slopeHit.normal.x >= 0 || straffe <= 0 && slopeHit.normal.x <= 0); //Checking the ground to see if we're going uphill or downhill.
         float f = straffe;
 
          f = downHill ? f : f / 1.5f;
 
         Vector3 targetVel = new Vector3(f, 0, 0);
         Vector3 slopeMove = Vector3.ProjectOnPlane(targetVel, slopeHit.normal);
         Vector3 velChange = slopeMove - rB.velocity;
 
         rB.AddForce(velChange, ForceMode.VelocityChange);
 

If there are no good physics solutions to this problem than I think clamping the player to the ground would be good as well... not quite sure how to do that though.

Any thoughts? Thanks!

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avatar image Razputin · Apr 09, 2021 at 01:14 PM 0
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bumpppppppp

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Answer by Kaldrin · Apr 09, 2021 at 01:28 PM

Hey! I am not quite sure what you mean by shooting off slopes? Could you provide with an example of what is happening?

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avatar image Razputin · Apr 09, 2021 at 02:04 PM 0
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This image explains well.

http://i.imgur.com/p9pqOUb.png?1

avatar image Kaldrin Razputin · Apr 09, 2021 at 02:13 PM 0
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Okay I understand better It's weird that it's behaving this way even though you tell it to stick to the ground (If I understand correctly your code)

I am not familiar with the ForceMode and ProjectOnPlane things so I'm not sure if I can suggest a better solution but clamping it with a raycast is probably the best idea. Is it 2D or 3D ?

avatar image Razputin Kaldrin · Apr 09, 2021 at 02:19 PM 0
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2.5D so I'm just using the X/Y axis with 3D tools.

I think the issue is that I'm projecting straight down so I cannot predict upco$$anonymous$$g changes to the grounds terrain.

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avatar image HellsHand · Apr 09, 2021 at 02:25 PM 0
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I've accomplished this with a spider I made by adding an empty game object a bit forward of my character as something like a counter-weight. Unfortunately I don't have access to the code and setup till I'm out of work but it might be an idea.

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