Realistic Jump?

Blitz3D Forums/Blitz3D Programming/Realistic Jump?

Guy Fawkes

(Posted 2009) [#1]

How can I make a jump code that looks as real as playstation2?

Like I need my model to jump then animate, then show a landing animation.

Adam Novagen

(Posted 2009) [#2]

Well, you're looking for two concepts combined here. First off, the actual jump. This is pretty simple; if your program has gravity, then you just have to create a "Jump#" variable which acts almost like reverse gravity, and decreases over time while in the air.

As far as animating you model, investigate the LoadAnimMesh(), LoadAnimSeq() and Animate() commands. there's a demo in the "mak" folder of the B3D samples which shows animation of meshes; check it out. And remember, of course, you have to create the actual animation in your 3D modeler.

Guy Fawkes

(Posted 2009) [#3]

Well, I need to see a code in order to learn. doesnt matter how small it is. I know how to decrease. BUT I dont know how to use a timer to do this.

Adam Novagen

(Posted 2009) [#4]

Right, that's why I suggested looking at mak's animation demo; it's a complete working program, albeit small. It should give you enough to go on, if you combine it with the Blitz HelpDocs.

As far as using a timer goes, what kind of timer are we talking here? A value timer?

While Not KeyHit(1)
...
Timer = Timer + 1
...
Wend

A Millisecond timer?

While Not KeyHit(1)
...
If MilliSecs() => LastTick + Timer
...
EndIf
...
Wend

Or a timer timer?

Timer = CreateTimer(60)
While Not KeyHit(1)
...
WaitTimer Timer
...
Wend

Ross C

(Posted 2009) [#5]

To be honest, I don't recommend actually making the character jump in an animation sequence. If you doing it, have an animation sequence of the character lifting off, jumping up, falling, and hitting the ground. That way you have much more control over the jump.

As for physics and gravity. I used a cos loop to generate the increasing speed.

I'm not quite sure what a Playstation 2 jump is though.

Adam Novagen

(Posted 2009) [#6]

OH, wait wait wait, you mean a timer for your jumping! Oh, okay, well here's a jumping snippet from my current project, with comments & spacing added for ease of understanding:

;REMEMBER TO DEFINE THESE AT STARTUP
Global Gravity#,Jump#

;...

;Now we have the actual gravity & jumping code.

;Now we have the gravity code.
;This checks to see if the player's entity has collided with the ground's EntityType.
If EntityCollided( PlayerEntity, Ground_Coll );Player is on the ground, so reset gravity.

    Gravity = 0

    ;Remember, it's no good letting the player jump in midair - they have to be able to jump
    ;only when they're on the ground.
    If KeyHit(57);Spacebar

        Jump = 2;Makes the player jump by moving upwards 2 units per update.

    EndIf

Else;Player is in the air, so start the fall.

    ;2 units is a nice top speed for gravity. Remember, you can change .04 as needed to change the
    ;speed of acceleration. Also remember, gravity moves you DOWN, so it has to be a negative
    ;number.
    If Gravity > -2 Then Gravity = Gravity - .04

EndIf


;This decreases the power of the jump, allowing the player to fall back down.
;You can change .04 to other values to make the jumps longer or shorter.
If Jump > 0 Then Jump = Jump - .04


;Finally, we move the player up and down according to the power of the jump and the power of gravity.
TranslateEntity PlayerEntity, 0, Jump + Gravity, 0

That's from memory, so it may need some tweaking, but it should work. It's also really simple math & coding, no complex geometry or anything. Hope it helps!

Ginger Tea

(Posted 2009) [#7]

ive never seen a playstation2 jump, ive seen a few 'fall' and get smashed to pieces on youtube though ;)

remember that EA ps3 tech demo where they said the player could only have 8 directions of movement on a ps2 yet the power of the ps3 allowed them to have fluid 360 smoth spinning and animation
aka utter hog wash as it was lazy animation/programming by EA that gave players 16bit console style movement

Adam Novagen

(Posted 2009) [#8]

Yeah, and that's ludicrous anyway, since I've seen many PS2 games, like the Sly Cooper series, where movement was most definitely not restricted to eight directions, even with a moving camera. Console power has nothing to do with program quality. :P