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Question by varie-tea · Jun 22, 2014 at 01:44 AM · physicsvelocityplatformerfrictionspin

Problem - 2D Physics changed?

Problem - 2D Physics changed?

Hello,

I had made a 2D platformer in Unity free where you control a rolling/flying ball. When you flew up against a surface, the ball maintained it's velocity and changed it's spin! I just bought Unity Pro v4.5.1f3, and now when the ball collides/flies up against a surface the friction caused by the spin slows the ball down, thereby BREAKING MY GAME!

Here's an example: I'm rolling along a corridor from left to right, so the ball is spinning clockwise, now when I fly up against the roof the clockwise spin of the ball is creating friction which creates a counterclockwise spin and thereby is slowing the ball down! In Unity free, what would happen, is that the friction caused by the clockwise spin would still create a counterclockwise spin but NOT affect the momentum of the ball!

I need to release the game very soon and now it's broken!

Please help me, thanks!

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avatar image Kiwasi · Jun 22, 2014 at 03:09 AM 1
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You can turn friction off in your physics material.

avatar image varie-tea · Jun 23, 2014 at 08:58 AM 0
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Thanks for the answer, but turning off friction in the physics material would make the ball slide - not roll, so this is not an option for me. Is there any way of switching back to "Unity free physics"?

avatar image varie-tea · Jun 26, 2014 at 08:15 AM 0
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I fixed the problem now. I lowered the rigidbody2D.inertia.

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