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    Stuff is falling way too slow

    Hi,

    I am having a problem with physics.
    There is a platform in my map, that is moving up and down. There are things standing on that platform.
    Unfortunately, when that platform moves down, the objects fall very slow. Obviously I want them to fall faster.

    Simulate physics and Enable gravity are both active.
    I've played around with MassInKg and Mass Scale, none of them had any effect.

    When the pawn is standing on the platform, that works fine.

    Can anyone give me a hint, where to change the physical behaviour?

    Regards
    Christian
    Attached Files
    Last edited by chricken; 10-31-2016, 02:18 PM.

    #2
    Mass actually does not come into play when we are talking about just falling objects. All objects fall at the same speed until they approach terminal velocity due to air resistance (which is why all objects fall the same in a vacuum). That value is the standard acceleration due to gravity and is around 9.8meters per second squared. So after 1 second, the object will be falling at exactly 9.8 meters per second. After two seconds it will be falling at 19.6m/s. Thats around 43mph. Obviously some objects will reach terminal velocity due to air resistance at MUCH lower speeds (such as parachutes) but for most solid objects you can disregard it for simple game physics.

    Is it possible your lift is accelerating faster than that? At what point does the object detatch? This happens in real life as well which is why objects that are not secured on those fast dropping roller coasters just fly away from you. I remember as a kid all my friends would place loose change on their laps (in retrospect a stupid idea .

    The only way to make objects fall faster is to change the world gravity. Note that by default it is set to -980 which is in cm. If you convert it to meters you get the 9.8m/s ^2 figure I listed above which hopefully clarifies where that comes from.

    I have experienced the feeling that objects are falling slowly in physics engines before (and seen the complaint many times) but I think a lot of it comes from the fact we don't have much first hand experience seeing heavy falling objects other than in movies where they apply lots of FX like camera shakes that make everything more intense feeling. Or there are lots of shots showing mostly the relative vs absolute speed.
    Last edited by RyanB; 10-31-2016, 03:27 PM.
    Ryan Brucks
    Principal Technical Artist, Epic Games

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      #3
      Sorry for necroposting, but problem remains. I personally think it doesn't matter how physics work in real world. What maters is developers intention. And if that intention is to bend laws of physics, it must be possible as it's possible in movies and such.
      For my case I need to change per object terminal velocity to much lower than default in some situations and revert it back in other. And I have very limited options for that if any.
      By the way, in reality every object has very different terminal velocity due to different cross section area on which air resistance apply as well as different air pressure on different altitudes that contribute to that and so on. And as there is such entity as "terminal velocity" in the engine and, let assume, we agree to sentence that physics must work realistically, where all this?

      Though, for now I guess, I get off by set GravityScale to 0 when character reaches needed velocity. It's pretty much mimic terminal velocity for my purpose.
      Last edited by Demnus; 06-03-2018, 06:27 PM.
      Check out my works here: Youtube channel. Project: CityBattle | Virtual Earth

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