Jumping/Falling Velocity Physics

[Sarkilas]

I'm horrible at physics, so I'm failing on this part. I want my object to start moving upwards on the Y-axis starting at the maximum peak rate, then gradually decreasing in velocity before it starts going back down in a natural curve as it would be in real life you wanted to jump. I just want the formula. The maximum fall velocity should be at 9.8, and the velocity will always be a float value.

First the variables that I use now:

float Velocity;

float Gravity;

The velocity value is the actual movement on the sprite that is subtracted on the Y-axis for the object. The gravity is set to a negative 9.8. The velocity starts at 9.

The handling of the velocity as soon as the jump occurs is like this right now (but it does not generate a smooth curve and does not compute as intended because I suck at physics):

if(!Jump){ Velocity = 9f; Jump = true; }

else if(Velocity <= Gravity){ Velocity = Gravity; }

else{ Velocity += (Velocity - Gravity) }

It creates a really weird curve on the jump. I want a smoother curve.

Is there any formula that would allow this to be done a lot simpler and smoother than I am currently doing it with my lack of physics skills?

For reference, this is XNA 4.0 in C#.

Thanks in advance!

 

[Gubid]

Are you using a vector or horizontal and vertical velocity?


Pretty simple but this should work.

 

Y_Velocity -= Gravity/Graphics.framerate

if (Y_Velopcity > GravityMax)

  Y_Velocity = GravityMax

 

 

[Sarkilas]

That creates a much better curve, yeah. I think that should do it. Could adjust it accordingly to my needs.

Thanks!

 

[Gubid]

Cool, glad I could help.