3-D sidescroller jumping - GameCreators Forum

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Mew151

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Joined: 1st Jun 2008

Location: Glitch city

Posted: 9th Nov 2008 23:38 Edited at: 9th Nov 2008 23:39

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Hey, I'm going making a 3D sidescroller, and I'm sort of stuck on the jumping part.
Here's the code I have so far:
(This only contains the jumping code. All of the other code is not included...)

+ Code Snippet

bool max_jump = false;
float jumpheight = 0;
bool jumping = true;
(A lot of code right here)
		if(dbShiftKey() == 1)
		{
			jumping = false;
		}
		if(jumping == false)
		{
			if(max_jump == false)
			{
				dbPositionObject(1, dbObjectPositionX(1), dbObjectPositionY(1) + jumpheight, dbObjectPositionZ(1));
				jumpheight += .5;
			}
			if(jumpheight > 2)
			{
				max_jump = true;
				jumping = true;
			}
		}
		if(jumping == true)
		{
			if(!dbObjectCollision(1, 0))
			{
				if(max_jump == true)
				{
					jumpheight = 0.2f;
					dbPositionObject(1, dbObjectPositionX(1), dbObjectPositionY(1) - jumpheight, dbObjectPositionZ(1));
					jumpheight += .5;
				}
				if(jumpheight == 0 && max_jump == true)
				{
					max_jump = false;
					jumping = false;
				}
			}
		}

ow! that hurt!

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Mew151

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Location: Glitch city

Posted: 9th Nov 2008 23:41

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Bump... (Sorry for the bump, I just forgot to click the mailback checkbox...)

ow! that hurt!

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SunDawg

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Joined: 21st Dec 2004

Location: Massachusetts

Posted: 10th Nov 2008 00:00

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Not how I would have approached it. Do you intend to have quadratic or linear jump paths? That is to say, do you want to have the character accelerate as they fall or fall at a constant rate?

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Mew151

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Posted: 10th Nov 2008 00:02

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I just want them to fall at a constant rate.

ow! that hurt!

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SunDawg

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Posted: 10th Nov 2008 00:13

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That's fairly simple, then. It would be best, I think, to use a boolean variable to tell whether the character is on the ground. Like playerIsGrounded or something. When you start your jump, give the player a certain velocity in the y direction, like playeryYVelocity=5.0. Position the player at their current location, plus their current velocity. (playerYPos+playerYVelocity) Then just subtract from the Y velocity until the player is touching the ground again, at which point playerIsGrounded would be made true again.

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Mew151

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Posted: 10th Nov 2008 00:36

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Like this?

+ Code Snippet

		if(dbShiftKey() == 1)
		{
			playerisgrounded = false;
		}
		if(playerisgrounded == false)
		{
			if(jumptimes > 5)
			{
				dbPositionObject(1, dbObjectPositionX(1), dbObjectPositionY(1) + jumpheight, dbObjectPositionZ(1));
				jumptimes += 1;
			}
			else
			{
				jumptimes = 0;
				dbPositionObject(1, dbObjectPositionX(1), dbObjectPositionY(1) - jumpheight, dbObjectPositionZ(1));
			}
		}
		if(dbObjectCollision(1, 2))
		{
			playerisgrounded = true;
		}

ow! that hurt!

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SunDawg

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Posted: 10th Nov 2008 00:51 Edited at: 10th Nov 2008 00:52

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I was thinking more along the lines of this:

+ Code Snippet

if((dbShiftKey()==1)&&(playerIsGrounded)){
     playerIsGrounded=false;
     playerYVelocity+=15;
}

if(!playerIsGrounded){
     dbPositionObject(1,dbObjectPositionX(1),dbObjectPositionY(1)+playerYVelocity,dbObjectPositionZ(1));
     playerYVelocity-=1;
}
if(dbObjectCollision(1,2)==1){
     playerIsGrounded=true;
     playerYVelocity=0;
}

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Mew151

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Posted: 10th Nov 2008 01:00

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Hmmm.... the jump is a little bit... fast, but, the falling is quite smooth.

ow! that hurt!

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SunDawg

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Posted: 10th Nov 2008 02:36

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You can slow it down by decreasing the initial velocity, and the rate of acceleration.

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FIGHTEX

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Posted: 25th Dec 2008 17:40

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before loop

+ Code Snippet

bool onWayUp=true;
    bool jumping=false;
    fHeight = dbGetTerrainGroundHeight ( 1, dbCameraPositionX ( ), dbCameraPositionZ ( ) );

in loop

+ Code Snippet

 fHeight = dbGetTerrainGroundHeight ( 1, dbCameraPositionX ( ), dbCameraPositionZ ( ) );
		 if (!jumping) dbPositionCamera ( dbCameraPositionX ( ), fHeight +3.0f, dbCameraPositionZ ( ) );	

        float j_CameraPositionY = dbCameraPositionY();

        if (dbSpaceKey()==1) jumping=true;
		if (jumping)
        {
		       if (onWayUp)
               {
	            dbMoveCameraUp(0, 0.3);
               }
			   else 
			   {
				dbMoveCameraDown(0, 0.6);             
			   }

               if ( j_CameraPositionY > fHeight+7.0f)  onWayUp=false;
	           if ( j_CameraPositionY < fHeight+3.0f)  
		       {
    
                j_CameraPositionY = fHeight+3.0f;
				dbPositionCamera(dbCameraPositionX(),j_CameraPositionY,dbCameraPositionZ());
			    onWayUp=true; 
			    jumping=false;
		       }
		}

this is a bounce that works for me

Game.Love

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