Pointing HUD arrow - GameCreators Forum

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lucifer 1101

15

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Joined: 26th Jan 2009

Location: Melbourne, Australia

Posted: 7th Mar 2009 03:40

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hi all i am trying to make an arrow draw on the bottom center of the screen with

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position object 11,camera position x(),camera position y()-2,camera position z()+5

but what i need of it is to stay in that position relative to the camera so that when i move about it seems to be glued there, the problem i am having is that when i turn my camera around it doesnt move with it and when i move the camera back it takes some time for the object to catch up....

any help with this would be very appreciated!

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HowDo

21

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Joined: 28th Nov 2002

Location: United Kingdom

Posted: 7th Mar 2009 10:52

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try lock object on objectnumber, this will lock the object to the screen will have to set the z value to about 20 to start untill you find what look right.

Dark Physics makes any hot drink go cold.

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lucifer 1101

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Joined: 26th Jan 2009

Location: Melbourne, Australia

Posted: 7th Mar 2009 12:26

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thanks that worked..

i am now tring to get the object to point to another object but it wont work i even tried using the command before i locked the object.

could it be that i need to ulock it every frame so that it can update the point at command...

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if RadarOpen=1 or Msel>0
	Show Object 11
	position object 11,0,-2,5
	point object 11,0,0,0
	lock object on 11
Else
	Hide Object 11
Endif

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HowDo

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Joined: 28th Nov 2002

Location: United Kingdom

Posted: 7th Mar 2009 17:49

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should only need to lock the object once.

try

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point object 11, object position x(id),object position y(id),object position z(id)

where id in the number you are hoping it will point at.

Dark Physics makes any hot drink go cold.

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lucifer 1101

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Joined: 26th Jan 2009

Location: Melbourne, Australia

Posted: 7th Mar 2009 23:58

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i actually tried pointing it to 0,0,0 and that didnt make it do anything and when i put in the variable that has the objects id it did not do anything either?

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Kira Vakaan

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Joined: 1st Dec 2008

Location: MI, United States

Posted: 9th Mar 2009 07:14 Edited at: 9th Mar 2009 07:17

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I never liked using the lock object on command because it really just keeps the object at the origin of the world and displays it on the screen anyway, and as you pointed out, any pointing or positioning that needs to be relative to the camera is a little screwy. To fix all this, I wrote this function a while back to keep an object in the camera's view at all times. It's purpose is to completely replace lock object on.

Here's the function:

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function OrbitCamera(Camera,Object,XDist#,YDist#,ZDist#,XAng#,YAng#,ZAng#,ZDepthFlag)
   position object Object,camera position x(Camera),camera position y(Camera),camera position z(Camera)
   rotate object Object,camera angle x(Camera),camera angle y(Camera),camera angle z(Camera)
   move object right Object,XDist#
   move object up Object,YDist#
   move object Object,ZDist#
   pitch object down Object,XAng#
   turn object right Object,YAng#
   roll object left Object,ZAng#
   if not ZDepthFlag then disable object zdepth Object
endfunction

The distances and angles passed into the function are all relative to the camera.

After calling this function to position the object, you can point it wherever you want to.

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set display mode 1024,768,32,1
sync on

hide mouse

make object box 1,1,1,3
make object sphere 2,2

do
   control camera using arrowkeys 0,1,1
   `Place the box 20 units ahead of the camera in the middle of the screen
   OrbitCamera(0,1,0,0,20,0,0,0,1)
   `Point the box at the sphere
   point object 1,0,0,0
   sync
loop
end

function OrbitCamera(Camera,Object,XDist#,YDist#,ZDist#,XAng#,YAng#,ZAng#,ZDepthFlag)
   position object Object,camera position x(Camera),camera position y(Camera),camera position z(Camera)
   rotate object Object,camera angle x(Camera),camera angle y(Camera),camera angle z(Camera)
   move object right Object,XDist#
   move object up Object,YDist#
   move object Object,ZDist#
   pitch object down Object,XAng#
   turn object right Object,YAng#
   roll object left Object,ZAng#
   if not ZDepthFlag then disable object zdepth Object
endfunction

Hope this is what you were looking for.

Edit: Just a thought, you might want to set ZDepthFlag to zero so the arrow you're trying to draw always appears over other objects...

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lucifer 1101

15

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Joined: 26th Jan 2009

Location: Melbourne, Australia

Posted: 9th Mar 2009 08:07 Edited at: 9th Mar 2009 08:55

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thanks heaps for this i will go over it and integrate it..

ill let you know how i go.

And thanks for the tip on the ZDepthFlag...

EDIT1: i have got it completely working except for the part when i move the camera back and forward, it does not stay with the camera but lags a bit and needs me to stop to catch up. Is there any way to fix this or is my computer just too slow

here is all the pointer code...

+ Code Snippet

Rem ***** Included Source File *****

HandlePointer:
if RadarOpen=1 or Msel>0
	Show Object 11
	OrbitCamera(0,11,0,2,5,0,0,0,1)
	if rselect=3 then PointId=3
	if rselect=4 then PointId=4
	if rselect=5 then PointId=5
	if rselect=6 then PointId=6
	if rselect=0
	else
	point object 11,object position x(PointId),object position y(PointId),object position z(PointId)
	endif
Else
	Hide Object 11
Endif
return

function OrbitCamera(Camera,Object,XDist#,YDist#,ZDist#,XAng#,YAng#,ZAng#,ZDepthFlag)
   position object Object,camera position x(Camera),camera position y(Camera),camera position z(Camera)
   rotate object Object,camera angle x(Camera),camera angle y(Camera),camera angle z(Camera)
   move object right Object,XDist#
   move object up Object,YDist#
   move object Object,ZDist#
   pitch object down Object,XAng#
   turn object right Object,YAng#
   roll object left Object,ZAng#
   if not ZDepthFlag then disable object zdepth Object
endfunction

thanks

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Kira Vakaan

15

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Joined: 1st Dec 2008

Location: MI, United States

Posted: 9th Mar 2009 21:39 Edited at: 9th Mar 2009 22:08

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Hm, does it? That doesn't make too much sense as the function will always position the object (XDist#,YDist#,ZDist#) units away from the camera. Have you made sure you handle camera movements before updating the pointer position?

Edit: I just did some testing, and using a movement style similar to the one I know you're using, I got the arrow to both keep up with the camera and lag behind it depending on which update I did first. Moving the camera before the arrow is what you want.

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lucifer 1101

15

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Joined: 26th Jan 2009

Location: Melbourne, Australia

Posted: 10th Mar 2009 00:52

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thanks heaps that worked perfectly, its just a little shaky...

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