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Change Drag to Quadratic Drag Force

Discussion in 'Physics' started by mentalgear, Aug 1, 2019.

  1. mentalgear

    mentalgear

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    Jul 19, 2019
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    I just finished watching the following video from GDC about a talk on how to make physics more realitic in unity.
    The speaker recommends using a quadratic function for drag force in unity instead of the normal linear one.
    However, I don/t seem to find how to change the default drag function in unity. Anyone can give me a hint ?

    Video:
    Forward to more or less 18:00 for the comment on drag:
    https://www.gdcvault.com/play/1021921/Designing-with-Physics-Bend-the
     
    mentalgear, Aug 1, 2019
    #1

  2. MelvMay

    MelvMay

    Unity Technologies

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    There isn't a stock option for that but all drag does is manipulate the velocity, something which you are free to do using whatever function you like.
     
    MelvMay, Aug 1, 2019
    #2

  3. MelvMay

    MelvMay

    Unity Technologies

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    MelvMay, Aug 1, 2019
    #3
    mentalgear likes this.

  4. mentalgear

    mentalgear

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    Wow, great thank you Melv so much !
    In case I want quad. drag for all my objects in the scene, would I need iterate over all the game objects and attach a script called quad. drag to them, or is there a more elegant solution ?

    Since you seem to work with Unity, and since Unity seems to explore other phX engines and also wants to become a player for (robot) simulations (that's actually what I explore unity for), wouldn't it make sense to add quadratic/realistic drag as a chosable default ?
     
    mentalgear, Aug 1, 2019
    #4

  5. MelvMay

    MelvMay

    Unity Technologies

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    May 24, 2013
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    It could be added but would require changing the respective physics engines (Box2D and PhysX source) and there's not been a huge call for it. Things tend to get implemented prioritised on that.
     
    MelvMay, Aug 1, 2019
    #5