1. #1

    Is Trials Fusion really physics-based?

    Hello,

    I thought that the physics of Trials Fusion is quite accurate in many aspects, however I do not understand if it is fully.
    My concern is albout the possibility to spin the bike backwards - for example - while flying, and then return to a rotational steady state, and spin it forwards (or vice-versa).

    Mathematically speaking, while in the air, there is no external torque applied to the bike/rider system, and so there cannot be any change in total angular momentum. So if the rider is spinning backwards at a certain time, it will never be able to invert this motion and spin forwards, without touching another object.

    The only thing I can think of, is that the air offers some drag, that can contribute to change the angular momentum. This seems unrealistic, though.

    Has anyone experience/comments on this? Can somebody who has experience in real trials or motocross tell me if it is possible to invert the direction of spinning while in the air? Is it a real simulation, or this aspect breaks the law of physics for the sake of playability?

    Cheers,

    maTTeo
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  2. #2
    Tully__'s Avatar Global Moderator
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    I've not played Fusion, only Evolution but I believe the "physics" is similar. If that is indeed the case, it's a game and can't be directly correlated with real life.

    It is possible in real life to make some apparent changes in bike rotation while airborne by juggling the rotation of the wheels - rev the engine should lift the front as the wheel rotation increases in the other direction. Braking should achieve the opposite if the wheels are already spinning forward fast. For some idea of what other manipulations are possible, browse through some of these: https://www.youtube.com/results?sear...demons+of+dirt
    If it can be done, those guys are among the few you can be sure have managed it.
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  3. #3
    Hi,

    Originally Posted by Tully__ Go to original post
    It is possible in real life to make some apparent changes in bike rotation while airborne by juggling the rotation of the wheels - rev the engine should lift the front as the wheel rotation increases in the other direction. Braking should achieve the opposite if the wheels are already spinning forward fast.
    Thanks for the insight. You are right, it is indeed possible to accelerate the rear wheel or brake it (if it was rotating) to obtain a slight change in the bike/rider rotational speed, and this is indeed implemented (I think) in Trials. However still does not explain why by just "leaning the rider" back and forth can change the rotation of the bike... It seems just not real.

    Cheers

    maTTeo
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  4. #4
    yes the game is physics based while exagerated

    the leaning in air isn't realistic though but thats for gameplay reasons unless the rider farts like crazy and can make windstroms with breathing out

    you can change your rotation momentum in real life by braking while in air, if you change the rotational speed of your backwheel your angular momentum will change
    i have never driven a motorcycle though

    edit:some ninja's here
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  5. #5
    Blackbird56695's Avatar Member
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    I have no real life motocoss or trials experience..
    In regards to the change in direction when flipping id say that is possibly exaggerated for the sake of playability, (but i don't know for sure).

    Think of a trials rider in a 0G vacuum. if he was already slowly moving forward & slowly forward flipping as he did. he would continue to do so forever, until another force acted upon them (bike or rider).
    The rider/Humans are full of chemical potential energy so he can exert force to a area of the bike, change his position ect. that may lead to changes in rotation.
    Obliviously gets a tad more complicated when you pop the bike & rider back under normal conditions, but that's an interesting thought experiment that maybe could answer some things...

    p.s. the emission from the exhaust in that environment would be a source of snail like propulsion...
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  6. #6
    dasraizer's Avatar Senior Member
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    the game definitely uses helpers, but i have to say its still very good. it would be interesting to try the game without any helpers at all, although nearly all the tracks wouldn't be playable, those that would be, would be extremely difficult to pass without good throttle and balance control.
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  7. #7

    re:

    The game is physics-based in the way that some movies are based on a true story. There's always some degree of creative license, which often makes for a better and more memorable viewing experience (tells a more interesting story or creates more dramatic conflict etc).

    Part of the reason we play video games is to escape reality, although the physics in Trials is consistent enough to not completely disconnect us from it. I'd say the physics are more reliable than realistic. The experience is closer to Burnout than Forza which really fits with the series.
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