smooting for jumping

Blitz3D Forums/Blitz3D Beginners Area/smooting for jumping

Rubiks14

(Posted 2005) [#1]

ok yes i know i've posted about jumping before but this is different because i have the jumping done it's just once the camera gets to a certain point it comes back down like it hit a barrier and i no y it does that i just want it to be smoot like a real jump you know, here is my code

; press spacebar to jump
If KeyHit(57) And falling = False
	jumped = True
EndIf
If jumped = True
yvel# = yvel# + .6
; if the player is at highest point, start moving down
If yvel# >= 6
jumped = False
EndIf
EndIf
; start the falling process
yvel# = yvel# - .3
If yvel# <= 0
	yvel# = 0
	falling = False
EndIf

Rob Farley

(Posted 2005) [#2]

If you follow my example from your other post where you posted the same problem it'll work fine.

http://www.blitzbasic.com/Community/posts.php?topic=42453

Ross C

(Posted 2005) [#3]

Use Cos for you jumping :o) Basically, when the jump is rising upwards, have a variable and add one to it. When the jump is falling, suntract a value from it. Then, plug this into something like:

moveentity player,0,cos(jump_value),0

Since Cos is a mathimatical wave, it will form a smooth jumping motion. Here's some code for it:

Graphics3D 800,600
SetBuffer BackBuffer()


Global camera = CreateCamera()
PositionEntity camera,0,0,-10

Global light = CreateLight()

Global cube = CreateCube()

Global jump_value = 0
Global jump_flag = 0

While Not KeyHit(1)


	If KeyHit(200) And jump_flag = 0 Then
		jump_flag = 1
	End If

	If jump_flag = 1 Then
		MoveEntity cube,0,Cos(jump_value)/10,0
		jump_value = jump_value + 2
		If jump_value >60 Then
			jump_flag = 2
		End If
	ElseIf jump_flag = 2 Then
		MoveEntity cube,0,-Cos(jump_value)/10,0
		jump_value = jump_value - 2
		If jump_value < 0 Then
			jump_flag = 0
			jump_value = 0
		End If
	End If


	UpdateWorld
	RenderWorld
	Flip
Wend
End

Rubiks14

(Posted 2005) [#4]

ok Rob i tried yours but it doesn't round off like it does in yours but that might be because it is different in 2d
and Ross yours is just doin what mine already does which is falling as soon as it reaches the point and i want it to jump like halo you know when you jump and it gets to the highest point it kinda rounds off insead of just instantly going down

Ross C

(Posted 2005) [#5]

Well, change the value at which the jump flag is changed... this line...

If jump_value >60 Then

change it to 70 80 or even 90.

Rob Farley

(Posted 2005) [#6]

2d or 3d makes bugger all difference.

Ross' example will fail if you're jumping from a high point to a low point.

Ross C

(Posted 2005) [#7]

Yeah, i realise that :o) Just to demonstrate the use of Cos for jumping :o)

Sledge

(Posted 2005) [#8]

The example I posted in your other thread gave smooth jumping without cos/sin for exactly the reason given by Rob.

Ross C

(Posted 2005) [#9]

Well, you cap the angle applied into Cos, say at 70, the point where he no longer accelerates downwards. It was just a quick example.