3d object question - GameCreators Forum

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SofaKing

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Posted: 5th Dec 2013 21:04

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New to DBP. Making a sports game. Created a PLAIN and textured it with a graphic of the field. Came out OK. Then wanted to use spheres to represent players, but when I create a sphere, it appears on a blue background with no field in view. Any ideas? Thanks.

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LBFN

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Posted: 6th Dec 2013 01:09

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My thought is that you have autocam on (I think that is the default). What this does is places the camera based upon the last object loaded / created. There are a couple of solutions I can suggest.
1. Leave AUTOCAM on, create the player spheres first and create the playing field last.
2. Use the command AUTOCAM OFF early in your code, place all of the objects and place and aim the camera.

I recommend #2. It can be done something like this:

+ Code Snippet

sync on: sync rate 60
autocam off
rem create spheres and playing field
rem
rem this assumes the playing field is object #1
x# = get object position x(1)
y# = get object position y(1)
z# = get object position z(1)
position camera x#,y# + 100.0,z# - 100.0
point camera x#,y# + 100.0,z#
repeat
   control camera using arrowkeys 0,3.0,2.0
   sync
until spacekey() = 1
end

You can use the arrowkeys to move around. You might have to adjust the values for the camera position some to get it right, as it depends upon how large your plane for the playing field is.

Hope this is helpful. If you still have issues, please post your code (click the CODE button, paste your code, making sure the cursor is at the end, and click the CODE button again) and I will take a look.

So many games to code.....so little time.

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SofaKing

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Posted: 6th Dec 2013 03:18

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Thanks for reply.

Using suggestion #1: field appears but no sphere.

Using #2: Won't compile.

Here's code (if I do it right):

+ Code Snippet


Rem ***** Main Source File *****
sync on
sync rate 60
autocam on

set display mode 1280,800,32
set window position 0,0

make object sphere 11,.05
position object 11,0,0,-700

make object plain 1,1232,640,1
load image "Field.png",1,0
texture object 1,1
position object 1,0,130,-775
rotate object 1,10,0,0

Do
sync
Loop

Thank you.

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SofaKing

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Posted: 6th Dec 2013 03:42

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Sorry...just messed with size of sphere and position on Z-axis and it did turn up. So, do I understand: the value of the Z for sphere position being more negative moves it closer (beyond field object)?

What I would like to do is place the plain flat (facing up at camera...difficult to describe, I think, with XYZ), so I must position camera to look down at field?

Then I want player spheres to just touch that plain, but not sure what value to give them to place them precisely.

I attempted to rotate and position plain...would it be better to move camera around until it looked down on field?

Thanks for your kind reply.

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LBFN

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Posted: 6th Dec 2013 14:26 Edited at: 6th Dec 2013 14:29

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The rotation of the playing field plane needs to be rotated on the X axis 90 degrees. I would suggest you simply place the playing field at 0,0,0 (which is the default) and work from there . Bear in mind that object locations are dead-center, so if your player sphere is 25 units, you would need to place it at 12.5 on the Y axis for it to be placed correctly.

To view it from overhead, move the camera up on the Y axis and point it downward. Take a look at this. You should see the entire playing field on the screen (I colored it green as I don't have your texture) and the sphere is colored red.

+ Code Snippet

sync on
sync rate 60
autocam off

set display mode 1280,800,32
set window position 0,0

make object sphere 11,25
position object 11,100,12.5,-100
color object 11,rgb(255,0,0) : // red
make object plain 1,1232,640,1
xrotate object 1,90.0
`load image "Field.png",1,0

`texture object 1,1
color object 1,rgb(0,255,0)
`position object 1,0,130,-775
`rotate object 1,10,0,0
position camera 0,650,0
point camera 0,0,0
Do
	sync
Loop
end

I'm sure you'll need to adjust things the way you want, but this shows how you can get setup.

So many games to code.....so little time.

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SofaKing

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Posted: 6th Dec 2013 18:40

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Thank you. That is perfect. Much to do for now but I'm sure I will be back with more questions. Thank you again.

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pcRaider

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Posted: 7th Dec 2013 00:06

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this is sample code

+ Code Snippet


Rem ***** Sample Code *****
set display mode 1024,768,32
set window on

sync on
sync rate 60
autocam off

make object sphere 11,10
color object 11,rgb(255,0,0)

make object plain 1,100,100
load image "Field.png",1,0
texture object 1,1
`position object 1,0,130,-775
rotate object 1,-90,0,0

position camera 0,100,-100
point camera 0,0,0

x#=0 : y#=0 : z#=0

Do
    if upkey()=1 then z#=z#+1
    if downkey()=1 then z#=z#-1
    if leftkey()=1 then x#=x#-1
    if rightkey()=1 then x#=x#+1
    if shiftkey()=1 then y#=y#+1
    if controlkey()=1 then y#=y#-1
    if spacekey()=1 then x#=0:y#=0:z#=0
    position object 11,x#,y#,z#

    gosub _debug
    sync
Loop
end

_debug:
  set text size 32
  set cursor 0,0
  print "use cursor-key, shift-key, ctrl-key "
  print "obj11  x",x#,"   y",y#,"   z",z#
return

windowsXp

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