GOD JUMPING!!!!!! - GameCreators Forum

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Jonny_S

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Joined: 10th Oct 2002

Location: United Kingdom

Posted: 31st Oct 2002 18:01

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This jumping is getting to me HELP! im using DB V.1.08 CODE PLZ!

monkey by day, crime fighting sex god by night

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Stevil

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Joined: 31st Oct 2002

Location: Australia

Posted: 1st Nov 2002 04:40

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Bit more info would be appreicated. But for general jumping adivce I suggest you research gravity a little. Tis a basic concept of what goes up most come down pretty much.

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Puffy

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Joined: 4th Sep 2002

Location: United States

Posted: 1st Nov 2002 05:51

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but what if there is wind??? didnt think of that did ya stevil

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Shadow

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Joined: 17th Oct 2002

Location: In the shadows

Posted: 1st Nov 2002 22:34

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To make realistic jumping you want to be concerned with acceleration (due to gravity). For example:

ground# is the y position of the ground
pos_y# is the y position of your object
vel_y# is the downwards velocity of your object
grav# is the gravitational acceleration

+ Code Snippet

do

pos_y# = pos_y# + vel_y#

if pos_y# < ground# 
   vel_y# = vel_y# + grav#
else
   vel_y#=0
endif

loop

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Zenders

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Joined: 4th Oct 2002

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Posted: 2nd Nov 2002 21:37

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`at the start of the jump:pos_y#=270 (or thereabouts) and tags(1)=1

`to make the jump curve shorter, make jumplen# greater
`to make the jump last longer, make change# shorter

`OK, pos_y#=newyvalue(posy#,ang#,jumplen#)

if tags(1)=1

if ang#>180
ang#=ang#+change#
endif

`and if you want the jump to propel you towards the ground

if ang#<90
ang#=ang#+change#
endif

endif

`and of course

if position#(1)<get ground height... etc
position#(1)=get grou...
tags(1)=0
endif

`lol thats short and confusing... but hopefully it might `help (though not be v. realistic - but it's still a `parabola)

PS Shadow Spirit - nice one i've never thought of doing it like that before...

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Shadow

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Joined: 17th Oct 2002

Location: In the shadows

Posted: 5th Nov 2002 21:06

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You can do realistic motion easily using velocities and acceleration.

Here's a pretty good program:

rem Activate manual sync
sync on
hide mouse

make matrix 1,10000,10000,25,25
load image "stoney01.bmp",1
prepare matrix texture 1,1,2,2
set matrix 1,1,1,0,1,1,1,1

dim hiLoad#(25,25)

load array "save.matrix", hiLoad#(0)

for x=0 to 25
for z=0 to 25

set matrix height 1,x,z, hiLoad#(x,z)*10

next z
next x

update matrix 1

undim hiLoad#(25,25)

make object sphere 1,100

rem Set variables for character position
x#=1000
z#=600

acc#=5

fog color rgb(128,128,128)
fog distance 9000
fog on

color backdrop rgb(128,128,128)

ink rgb(255,32,32),0

load cdmusic 2,1

set camera range 1,10000

rem Begin loop
do

`if music playing(1) = 0 then play music 1

rem Control camera with arrow keys
a#=wrapvalue(a#+10*(rightkey()-leftkey()))

push=upkey()-downkey()

pushX#=acc#*push*sin(a#)
pushZ#=acc#*push*cos(a#)

`fav=friction affected value
favX# = abs(slopeX())
favZ# = abs(slopeZ())

velX#=velX# + pushX# - slopeX() * favX#
velZ#=velZ# + pushZ# - slopeZ() * favZ#

if velX# > 80 then velX#=80
if velX# < -80 then velX#=-80
if velZ# > 80 then velZ#=80
if velZ# < -80 then velZ#=-80

x#=x#+velX#
z#=z#+velZ#

velX#=velX#*0.95
velZ#=velZ#*0.95

rem Update character
y#=get ground height(1,x#,z#)+50
position object 1,x#,y#,z#
yrotate object 1,a#

rem Position camera to the back of the character
cx#=newxvalue(x#,wrapvalue(a#+180),300)
cz#=newzvalue(z#,wrapvalue(a#+180),300)
cy#=get ground height(1,cx#,cz#)+100
position camera cx#,cy#,cz#

rem Point camera at object
point camera x#,y#,z#

text 1,1,str$(slopeX())
text 1,20,str$(slopeZ())
text 1,50,str$(velX#)
text 1,70,str$(velZ#)

rem Syncronise
sync

rem End loop
loop

function slopeX()

aY#=object angle y(1)
	oX#=object position x(1)
	oZ#=object position z(1)

oY# = get ground height(1,oX#,oZ#)
	nY# = get ground height(1,oX#+4,oZ#)

slope# = nY#-oY#

endfunction slope#

function slopeZ()

aY#=object angle y(1)
	oX#=object position x(1)
	oZ#=object position z(1)

oY# = get ground height(1,oX#,oZ#)
	nY# = get ground height(1,oX#,oZ#+4)

slope# = nY#-oY#

endfunction slope#

+ Code Snippet

rem Activate manual sync
sync on
hide mouse

make matrix 1,10000,10000,25,25
load image "stoney01.bmp",1
prepare matrix texture 1,1,2,2
set matrix 1,1,1,0,1,1,1,1

dim hiLoad#(25,25)

load array "save.matrix", hiLoad#(0)

for x=0 to 25
for z=0 to 25

	set matrix height 1,x,z, hiLoad#(x,z)*10

next z
next x

update matrix 1

undim hiLoad#(25,25)

make object sphere 1,100

rem Set variables for character position
x#=1000
z#=600

acc#=5

fog color rgb(128,128,128)
fog distance 9000
fog on

color backdrop rgb(128,128,128)

ink rgb(255,32,32),0

load cdmusic 2,1

set camera range 1,10000

rem Begin loop
do

`if music playing(1) = 0 then play music 1

rem Control camera with arrow keys
a#=wrapvalue(a#+10*(rightkey()-leftkey()))

push=upkey()-downkey()

pushX#=acc#*push*sin(a#)
pushZ#=acc#*push*cos(a#)

`fav=friction affected value
favX# = abs(slopeX())
favZ# = abs(slopeZ())

velX#=velX# + pushX# - slopeX() * favX#
velZ#=velZ# + pushZ# - slopeZ() * favZ#

if velX# > 80 then velX#=80
if velX# < -80 then velX#=-80
if velZ# > 80 then velZ#=80
if velZ# < -80 then velZ#=-80

x#=x#+velX#
z#=z#+velZ#

velX#=velX#*0.95
velZ#=velZ#*0.95


rem Update character
y#=get ground height(1,x#,z#)+50
position object 1,x#,y#,z#
yrotate object 1,a#

rem Position camera to the back of the character
cx#=newxvalue(x#,wrapvalue(a#+180),300)
cz#=newzvalue(z#,wrapvalue(a#+180),300)
cy#=get ground height(1,cx#,cz#)+100
position camera cx#,cy#,cz#

rem Point camera at object
point camera x#,y#,z#

text 1,1,str$(slopeX())
text 1,20,str$(slopeZ())
text 1,50,str$(velX#)
text 1,70,str$(velZ#)


rem Syncronise
sync

rem End loop
loop





function slopeX()

	aY#=object angle y(1)
	oX#=object position x(1)
	oZ#=object position z(1)

	oY# = get ground height(1,oX#,oZ#)
	nY# = get ground height(1,oX#+4,oZ#)

	slope# = nY#-oY#

endfunction slope#

function slopeZ()

	aY#=object angle y(1)
	oX#=object position x(1)
	oZ#=object position z(1)

	oY# = get ground height(1,oX#,oZ#)
	nY# = get ground height(1,oX#,oZ#+4)

	slope# = nY#-oY#

endfunction slope#

(Hope next bit works)
You'll need this file too ('save.matrix'):

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