Keeping an object with the camera

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Disrupter52

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Posted: 26th Jul 2011 20:27

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Hey everyone

So i made 2 weapons that i want to pick up and have stay on-screen in my game. I got the picking up part working, but i cant quite get the staying part.

I want my weapons to stay on the right side of the screen a little in front of the player, like they were holding it. I cant get the object to stay when the camera rotates though, im not sure how to go about doing that.

thanks

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chafari

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Posted: 26th Jul 2011 21:20

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Have a look to command lock object on

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I'm not a grumpy grandpa

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Disrupter52

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Posted: 29th Jul 2011 04:54

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Yea, ive tried that and the object moves around nonsensically. Idk how to work it properly to have it do what i want.

right now when i try it, the object is only where it should be at the origin and as i move, the coordinates are where they should be (i have my coords and the objects print) and it says its always at the same z and +5 on the x (which is how i coded it) but the farther i move from 0,0 (i dont move on the y ignore it.) the more it like scales out of view til it disappears.

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chafari

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Posted: 29th Jul 2011 12:26 Edited at: 29th Jul 2011 12:27

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Try this piece of code. You can change the gun for yours.

autocam off:hide mouse
create bitmap 1,50,50:for i= 1 to 1550:ink rgb(30,255,55),0:line rnd(60),i,i,rnd(130)
next i:blur bitmap 1,6:get image 1,10,10,50,50:delete bitmap 1

sync on
arma=20  //gun
bala=21  //bullet
make object box 1,3000,1,3000
texture object 1,1
scale object texture 1,3,3

make object box arma,1,1,10
make mesh from object 1,arma
make object cylinder 100,18
make mesh from object 2,100
delete object 100

add limb arma,1,1:offset limb arma,1,0,0,-8:scale limb arma,1,150,150,60
add limb arma,2,2:scale limb arma,2,12,50,7:rotate limb arma,2,90,0,0:offset limb arma,2,0,0,-10
color object arma,rgb(10,10,10)
make object box bala,1,1,20:color object bala,rgb(200,0,0):hide object bala
make object sphere 3,30
position object 3,600,20,600

do
gosub _controla_camara
gosub bala
if object collision(bala,3)=1 then position object 3,300+rnd(1000),10,300+rnd(1000)
sync
loop

_controla_camara:
`player controls (camera)
if upkey()=1 then x#=newxvalue(x#,a#,1) : z#=newzvalue(z#,a#,1)
if downkey()=1 then x#=newxvalue(x#,a#,-1) : z#=newzvalue(z#,a#,-1)
if leftkey()=1 THEN x#=NEWXVALUE(x#,a#-90,1)
if leftkey()=1 then z#=NEWZVALUE(z#,a#-90,1)
if rightkey()=1 THEN x#=NEWXVALUE(x#,a#-90,-1)
if rightkey()=1 then z#=NEWZVALUE(z#,a#-90,-1)

`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
`controlamos la vista de camara
`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   yrotate camera camera angle y()+(mousemovex()/10.0)
   xrotate camera camera angle x()+(mousemovey()/10.0)
a#=camera angle y()

`limitacion de la camara
if camera angle x() >60 then xrotate camera 60
if camera angle x() <-45 then xrotate camera -45
`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

`updating camera, gun and bullets positions
position camera x#,145,z#
position object arma,x#,145,z#
position object bala,x#,145,z#

set object to camera orientation arma

`moving slightly the gun to its correct position (aprox.)
move object arma,15
move object right arma,3
move object down arma,3

move object bala,15
move object right bala,3
move object down bala,3

return

bala:
set cursor 310,235:ink rgb(255,0,0),0
print " +"
`-------------------------------------------------------------
`making bullet shoot where the gun ends
if dispara=0
set object to object orientation bala,arma
endif
if mouseclick() and dispara=0
dispara=1
show object bala
endif

if dispara=1
la=la+10
run=run+1
move object bala,la
endif

if run>200

run=0
la=0
dispara=0
hide object bala
endif
return
`--------------------------------------------------------

+ Code Snippet

autocam off:hide mouse
create bitmap 1,50,50:for i= 1 to 1550:ink rgb(30,255,55),0:line rnd(60),i,i,rnd(130)
next i:blur bitmap 1,6:get image 1,10,10,50,50:delete bitmap 1

sync on
arma=20  //gun
bala=21  //bullet
make object box 1,3000,1,3000
texture object 1,1
scale object texture 1,3,3

make object box arma,1,1,10
make mesh from object 1,arma
make object cylinder 100,18
make mesh from object 2,100
delete object 100

add limb arma,1,1:offset limb arma,1,0,0,-8:scale limb arma,1,150,150,60
add limb arma,2,2:scale limb arma,2,12,50,7:rotate limb arma,2,90,0,0:offset limb arma,2,0,0,-10
color object arma,rgb(10,10,10)
make object box bala,1,1,20:color object bala,rgb(200,0,0):hide object bala
make object sphere 3,30
position object 3,600,20,600

do
gosub _controla_camara
gosub bala
if object collision(bala,3)=1 then position object 3,300+rnd(1000),10,300+rnd(1000)
sync
loop

_controla_camara:
`player controls (camera)
if upkey()=1 then x#=newxvalue(x#,a#,1) : z#=newzvalue(z#,a#,1)
if downkey()=1 then x#=newxvalue(x#,a#,-1) : z#=newzvalue(z#,a#,-1)
if leftkey()=1 THEN x#=NEWXVALUE(x#,a#-90,1)
if leftkey()=1 then z#=NEWZVALUE(z#,a#-90,1)
if rightkey()=1 THEN x#=NEWXVALUE(x#,a#-90,-1)
if rightkey()=1 then z#=NEWZVALUE(z#,a#-90,-1)

`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
`controlamos la vista de camara
`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   yrotate camera camera angle y()+(mousemovex()/10.0)
   xrotate camera camera angle x()+(mousemovey()/10.0)
a#=camera angle y()

`limitacion de la camara
if camera angle x() >60 then xrotate camera 60
if camera angle x() <-45 then xrotate camera -45
`xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


`updating camera, gun and bullets positions
position camera x#,145,z#
position object arma,x#,145,z#
position object bala,x#,145,z#


set object to camera orientation arma

`moving slightly the gun to its correct position (aprox.)
move object arma,15
move object right arma,3
move object down arma,3

move object bala,15
move object right bala,3
move object down bala,3

return

bala:
set cursor 310,235:ink rgb(255,0,0),0
print " +"
`-------------------------------------------------------------
`making bullet shoot where the gun ends
if dispara=0
set object to object orientation bala,arma
endif
if mouseclick() and dispara=0
dispara=1
show object bala
endif

if dispara=1
la=la+10
run=run+1
move object bala,la
endif

if run>200

run=0
la=0
dispara=0
hide object bala
endif
return
`--------------------------------------------------------

Cheers.

I'm not a grumpy grandpa

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Disrupter52

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Posted: 2nd Aug 2011 07:29

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Ok after much struggling, it doesnt help.

Im trying to make an axe basically sit right in front of the right side of the screen. Period. No matter where im looking.

set object to camera doesnt help, neither does locking it.

i also need it to work at a key press.

I can envision the camera being a point in space. The axe is based on another point that needs to revolve around the camera in a sphere essentially, but never moving closer or further from the camera.

Ultimately, ill have a model holding the axe and i guess that would be easier then what im doing, but i wanted to experiment with picking up objects and having them float around but apparently thats really complicated.

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WLGfx

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Location: NW United Kingdom

Posted: 2nd Aug 2011 16:06

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Have you tried something like this: (only pseudo code)

+ Code Snippet

Position Object my_axe,Camera Position X(),Camera Position Y(),Camera Position Z()
Rotate Object my_axe,Camera Angle X(),Camera Angle Y(),Camera Angle Z()
Move Object my_axe,5 `(or how far forward is needed away from camera)
Move Object Right my_axe,5 `(again how far is needed)
Move Object Down my_axe,1 `(same here too)

Is this is done after each camera update then your object will be in the same position.

Warning! May contain Nuts!

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Disrupter52

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Posted: 3rd Aug 2011 04:20

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I tried fiddling around with some of that code, it doesnt work the way i need it too. The rotate object based on the camera rotates the object, but it doest rotate it around the fixed point of the camera, it rotates it around the object according to the camera's angles.

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WLGfx

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Location: NW United Kingdom

Posted: 3rd Aug 2011 05:25

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I kinda understand what you mean. You can set the rotation something like this:

Rotate Object my_axe, Object Angle X( main_obj ), Camera Angle Y(), Object Angle Z( main_obj )

That way you're using the X and Z from the object but the cameras Y angle.

You might need to mix and match some of these for other objects.

Hope this helps...

Warning! May contain Nuts!

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Dar13

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Location: Microsoft VisualStudio 2010 Professional

Posted: 3rd Aug 2011 05:28 Edited at: 3rd Aug 2011 05:33

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Here's some code I ripped straight from my current project.
What it does is that it creates a player object(a .1 radius sphere at [0,0,0] at [0,0,0] rotation). Then it adds a limb(tiny triangle) at a position [1,0,4] offset from the player(just in front of and to the right) and rotates it 180 degrees(you may/may not need this). That's all in the first snippet.

In the second snippet, simply shows how you 'attach' a weapon(in your case an axe instead of a gun) by using the 'glue object to limb' command.

The third snippet shows how you update the original player object in order to keep limb your weapon is glued to in the view of the camera.

I realize that this is a bit complicated for what you might see as a simple task, but I had the same problem and this is my solution.

Note: The first and second snippet only need to called once(unless you use multiple weapons, in that case use the second snippet as needed). The third snippet needs to be called every loop or every time the camera changes position.

+ Code Snippet

gPlayer.b_oID=wtld_makeObjectSphere(.1,VECTOR_ZERO,VECTOR_ZERO,EWS_NONE)
	gPlayer.l_ID=find free object()
	
	make object triangle gPlayer.l_ID,0,0,0,0,0,0,0,0,0
	make mesh from object 1,gPlayer.l_ID
	delete object gPlayer.l_ID
	
	perform checklist for object limbs gPlayer.b_oID
	local limb : limb=checklist quantity()
	add limb gPlayer.b_oID,limb,1
	offset limb gPlayer.b_oID,limb,1,0,-4
	rotate limb gPlayer.b_oID,limb,0,180,0
	hide limb gPlayer.b_oID,limb
	hide object gPlayer.b_oID
	gPlayer.l_ID=limb

+ Code Snippet

glue object to limb gun.oID,gPlayer.b_oID,gPlayer.l_ID

+ Code Snippet

position object gPlayer.b_oID,gCam.pos.x,gCam.pos.y,gCam.pos.z
rotate object gPlayer.b_oID,gCam.rot.x,gCam.rot.y,gCam.rot.z

Note about the snippets: These are literally ripped straight from my game. They will not work by just copying and pasting, you will have to adapt them to your program. If I can find the original snippet I got this idea from I'll link it here.

EDIT: Here's a more generic snippet:http://forum.thegamecreators.com/?m=forum_view&t=150776&b=1&msg=1758398#m1758398

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