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 Post subject: Re: Physics (Gravity)
PostPosted: Wed Sep 30, 2009 3:00 pm 
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Joined: Sun Feb 12, 2006 8:56 pm
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If your player is at an angle, you would break the force into x and y components using sin and cos.
What?
EDIT: You mean xVel = cos(acceleration) and yVel = sin(acceleration)?

Also, what does fps stand for? Feet per second?
I understood pretty much everything else of that. :)

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 Post subject: Re: Physics (Gravity)
PostPosted: Wed Sep 30, 2009 3:18 pm 
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Should be calculating and/or accelerating every frame, no?

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 Post subject: Re: Physics (Gravity)
PostPosted: Wed Sep 30, 2009 9:26 pm 
 

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FPS stands for frames per second. This is how fast your game runs. Usually to convert acceleration into velocity you need to multiply acceleration * time (since accel is m/s^2 and vel is just m/s). So we have frames/s, but we need s. So 1/fps is s/frame, which is perfect since all these calculations have just taken place in 1 frame. So therefore, 1/fps is just s, so doing accel/fps gives you velocity.

And yes, xaccel = accel*cos(angle) and yaccel = accel*sin(angle).

And yes, you are doing this calculation every frame, which is why you use the fps in converting accel to vel and vel to pos.

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