Object Rotation - GameCreators Forum

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Ad87am

19

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Joined: 4th Aug 2005

Location: England / London

Posted: 8th Sep 2005 21:55

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I am trying to make an object rotate. Here is what i have already -

+ Code Snippet

`*********Movement Contorls******************
Set camera to follow Object position X(1),Object position Y(1),Object position Z(1),Object angle Y(1),500,100,5,0
If upkey()=1 then Xrotate object 1,Wrapvalue(Object angle X(1)+1)
If downkey()=1 then Xrotate object 1,Wrapvalue(Object angle X(1)-1)
if Upkey()=0
If Downkey()=0
NewX#=Curveangle(0,Object angle X(1),100)
Xrotate object 1,NewX#
endif
endif

`*******Auto Move**********
if keystate (17)=1 then move object 1,20
`**************************

If rightkey()=1 then Yrotate object 1,wrapvalue(Object Angle y(1)+2)
If rightkey()=1 then xrotate object 1,Wrapvalue(Object angle x(1)+1)

If leftkey()=1 then Yrotate object 1,wrapvalue(Object Angle y(1)-2)
If leftkey()=1 then Xrotate object 1,Wrapvalue(Object angle X(1)-2)



if Rightkey()=0
If Leftkey()=0
NewX#=Curveangle(0,Object angle X(1),100)
Xrotate object 1,NewX#

endif
endif

and what i am actually trying to do is when the right key is pressed, the object rotates >>>> and when the left key is pressed, it rotates <<<<. This is basic movement which i am happy with but what would make it even better is if it went <<<<< and and rotated down a bit, if you know what i mean. Like an Aircraft when it moves left, it pitches left and down. Anyone know how to do this? I think its something simple but cant figure out how to do it.
Thanks

http://www.Bevansfunbox.com

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Silent Knight

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Joined: 25th Jan 2005

Location: In Your Mind

Posted: 8th Sep 2005 22:09

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im not exaclty sure what you are saying but try rotating along the z axis

Version--DB Classic
900 mhz AMD Athlon, 128 MB RAM,
16 MB NVidia Vanta gfx card, Windows ME System software

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Antidote

19

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Joined: 18th Mar 2005

Location: San Francisco, CA

Posted: 8th Sep 2005 22:28

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zrotate object

That is the command use the same steps for yrotate and xrotate.

The help files would have helped. Haha get it.

Formerly known as SFLM.

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Ad87am

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Joined: 4th Aug 2005

Location: England / London

Posted: 8th Sep 2005 23:14 Edited at: 8th Sep 2005 23:14

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Hm, its hard to eplain. When the up key is pressed, the aircraft pitches down and when the down key is pressed, it pitches up. I have the left and right key working as the front of the aircraft moves out left or right and because its moving it follows the path. What i want to do is be able to do is tilt the object. Just like rotate object but it doesent work becasue it moves up also. I have drawn a picture to try and help.

When the left and right key is pressed, it respresents the red arrows, the front turns out and the foward motion drives thru that path which makes it change direction.

What i want is to make the object rotate as in (Twist) when it moves off to one direction. This is represented by the green arrows. So when the left key is pressed, it twists left and the right wing sticks up in the air, and when the right key is pressed it twists right and the left wing is sticking up in the air.

Do you understand?

http://www.Bevansfunbox.com

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Scorpyo

22

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Joined: 26th Aug 2002

Location: italy

Posted: 9th Sep 2005 01:05

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Run this:

http://xoomer.virgilio.it/tiscap1/DBP/FlyTest_lite.zip

and let me know what you need more if it doesn't help

use arrow keys

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Ad87am

19

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Joined: 4th Aug 2005

Location: England / London

Posted: 9th Sep 2005 19:10

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All i need to do is make it twist around left or right. There is too much to go through there and im sure its just a smiple command.

http://www.Bevansfunbox.com

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Scorpyo

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Joined: 26th Aug 2002

Location: italy

Posted: 10th Sep 2005 11:24

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Lazy uh?

use the same model with this:

+ Code Snippet

set display mode 800,600,16
hide mouse
sync on
backdrop on
autocam off
set global collision off
gosub loadship
sync rate 30
set camera range 1,10000
position camera 0,80,-200
point camera 0,0,0
rem ********************MAIN LOOP******************
labelmainloop:
do
gosub control
sync
loop
rem **************** SUBROUTINES ********************
rem ****LOAD SHIP****
rem object 9998
loadship:
load object "testshipplain.x",9998
set object 9998,1,1,0,1,1,1,1
xrotate object 9998,90
fix object pivot 9998
position object 9998,0,0,0
return
control:
rem **TILT LEFT / RIGHT **
if leftkey()=1 then oaz#=wrapvalue(oaz#+0.5)
rotate limb 9998,1,0,0,oaz#
if rightkey()=1 then oaz#=wrapvalue(oaz#-0.5)
rotate limb 9998,1,0,0,oaz#
return

end

Limb 1 ( or limb 0 ) rotation is the only way to keep the object z rotation relative to its own axis (local rotation). zrotate object will use world angles, therefore when going East to West or viceversa, zrotate makes it pitch up or down.

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master programmer

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Joined: 30th May 2005

Location: 3D Space

Posted: 10th Sep 2005 11:40

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OK, I usually use turn object right and turn object left, but, you can use the rotate object thing, but, I really don't know what you want.

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Ad87am

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Joined: 4th Aug 2005

Location: England / London

Posted: 11th Sep 2005 23:28

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Im trying to make it roll left and right. You know like wen a plane wants to fly off left, it rolls left and shoots off in that direction.

http://www.Bevansfunbox.com

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SimSmall

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Joined: 7th Aug 2004

Location: United Kingdom

Posted: 14th Sep 2005 12:29 Edited at: 14th Sep 2005 12:31

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so you want to roll your aircraft left or right if either of those 2 keys are pressed? then as it's levelling itself out, you want it to gradually turn to face it's new direction, until it's flat?

If so:

+ Code Snippet

set object rotation zyx <object number>

check for left key

+ Code Snippet

if leftkey()=1
zrotate <object number>,wrapvalue(object angle z(<object number>) + 359)
dec AircraftAngleZ,10
endif

check for right key

+ Code Snippet

if rightkey()=1
zrotate <object number>,wrapvalue(object angle z(<object number>) + 1)
inc AircraftAngleZ,10
endif

level out the aircraft

+ Code Snippet

`left wing down
if AircraftAngleZ < 0
yrotate object <object number>,wrapvalue(object angle y(<object number>)+359.8)
zrotate object <object number>,wrapvalue(object angle z(<object number>)+0.2)
inc AircraftAngleZ,2
endif

`right wing down
if AircraftAngleZ > 0
yrotate object <object number>,wrapvalue(object angle y(<object number>)+0.2)
zrotate object <object number>,wrapvalue(object angle z(<object number>)+359.8)
dec AircraftAngleZ,2
endif

is this what you're after -- it's very difficult to actually determine what it is you're asking for

...maybe one day I'll finish a project

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TDK

Retired Moderator

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Joined: 19th Nov 2002

Location: UK

Posted: 14th Sep 2005 15:25

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Scorpyo is correct.

If you are doing a flight sim program, then the DB rotate, pitch and roll commands will only do what you want to do correctly when your plane is flying in a 'Northerly' direction.

Think of it like this:

Once you turn the plane to say East or West, the commands don't take the heading of the plane into account - they are still based on the terrain below which hasn't been rotated.

This can result in the the nose coming up or going down when you want to roll left or right.

TDK_Man

A New Alternative IDE For DB Classic!

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SimSmall

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Joined: 7th Aug 2004

Location: United Kingdom

Posted: 14th Sep 2005 20:28

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Actually trying the code I submitted, it doesn't work at all - sorry if you've tried to use it and had fun watching it all go wrong...

...maybe one day I'll finish a project

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