problems with jumping, and no I dont need to have the whole thing done for me

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GOD

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Posted: 17th Jun 2004 02:27

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Hey, im having some problems with my jumping code. I have searched through the form, and unfortunatly none of the things I found seemed to help. Right, this is my problem. I have gravity code and it works perfectly.

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  if object position y(1)>get ground height(1,object position x(1),object position z(1))+object size y(1)
    move object down 1,1
    endif

This works fine and is in its own function (I changed it so it would make more sence, but the function uses (Pull,object,matrix).)
Now i then went on to make jumping code which is this:

+ Code Snippet

    if spacekey()=1 then up=1
      if up=1
         for jumping = 1 to 20
              move object up id,.1
         next jumping
      endif

Now the problem with this is it is very jery, and the acceleration of the jump doesnt slow down when it nears the peak of the jump, it just changes direction instantly. How would you all sugest I fix this problem? Thanks for the help

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SandraD

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Posted: 17th Jun 2004 02:40

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Hi...

If you have the basics gravity implemented in your code you do the same thing as would happen in any falling objects, namely that gravity starts to reduce a jumping object's speed by it's gravity factor the moment it leaves the ground. This models the exact thing that happens in nature, ie, first year physics and all that.

Once gravity has applied its "drag" to the speed of the upward movemnt, the character will sloow, change direction, then accelerate to the ground.

S.

Any truly great code should be indisguishable from magic.

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GOD

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Posted: 17th Jun 2004 04:00

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unfortunatly, thats not what is happening in my program. I have them in diferent functions, the jumping and gravity, so i will try combined them to see if that helps.

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GOD

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Posted: 17th Jun 2004 05:58

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ok i got things working, sort of. I now have it so the character will jump up, and smoothly come back down. The only problem is that it will do one jump exactly as I want it to, but then the next jump will be very small and sketchy, and then it will have a regualr jump, then a bad one. It repeates this over and over and i dont know why. I went over the code many times and cant see whats doing it. Im probobly doin somthin obviously wronge and im just missing it, but I would appreciate the help. Heres the new code, I rewrote it completly because the other way just wasnt working.

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ch=object position y(1)+height#

if spacekey()=1 and jumpb=0
   height#=height#+10
   jumpb=1
endif

if jumpb=1
   position object 1, object position x(1),object position y(1)+height#,object position z(1)
endif

if ch>get ground height(1,object position x(1),object position z(1))
   height#=height#-.5
endif

if object position y(1)<=get ground height(1,object position x(1),object position z(1))
   jumpb=0
   position object 1,object position x(1),get ground height(1,object position x(1),object position z(1))+object size y(1),object position z(1)
endif

Thanks

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SandraD

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Posted: 17th Jun 2004 07:51 Edited at: 17th Jun 2004 07:56

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Hmmm...

Well I would have implemented it as something like this;

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` (following your code as close as possible)

ch=get ground height(1, object position x(1), object position z(1))

if spacekey and jump=0
   jump = 1
   height = 10
   high = 0
endif
if jump = 1
   dec height : rem this assumes a gravity constant of 1
   high = high + height
   if height = 0 then jump = 2
   position object 1, object position x(1), ch+high, object position z(1)
endif
if jump = 2
   inc height : rem assumes a gravity constant of 1
   high = high - height
  if height = 10 then jump = 0
  position object 1, object position x(1), ch+high, object position z(1)
endif

In this code, height is your present acceleration vertically and high is how far off the ground you are at any moment.

S.

Any truly great code should be indisguishable from magic.

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Mentor

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Posted: 18th Jun 2004 00:14

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I don`t see you reset the height# value when the object reaches the ground again, or is that bit of code left out?, try printing the values at the top of the screen and see what is happening that way.

Mentor.

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GOD

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Posted: 18th Jun 2004 06:29

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That was it menter, thanks a lot. I knew i was just missing somthing minor. Thanks for the help everyone.

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Hop a long

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Posted: 19th Jun 2004 00:15

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Oops! Looks like I've arrived after the fire is out. Any way here's my two cents worth.http://www.geocities.com/hifin2003/matrix_jump.html

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