Help with 3D cube code

[emook]

Hello chaps

I've mangled this together, but when the balls are near the camera, the ones far away appear in front and so on. I need help getting the ordering correct.

If you press space it will change to a 2d cube, how would I go about joining the square with lines?

Code: [Select]

InitMouse():InitKeyboard() : InitSprite() : InitSound() : UsePNGImageDecoder()
OpenWindow(0,0,0,800,600,"Window",#PB_Window_ScreenCentered)
OpenWindowedScreen(WindowID(0),0,0,800,600)
ExamineMouse()

image=CatchImage(#PB_Any,?img1,?img1e-img1)
ball_spr=CreateSprite(#PB_Any,260,260)
ball=CreateSprite(#PB_Any,260,260)

StartDrawing(SpriteOutput(ball_spr)) : DrawingMode(#PB_2DDrawing_Transparent) : DrawImage(ImageID(image),0,0) :StopDrawing()
StartDrawing(SpriteOutput(ball)) : Box(0,0,20,20,#Red) : StopDrawing()

I=60 :SIZE.f=25 : SCALE.F=0.0008 : DIST.f=3
ANGLEX.f=0 : ANGLEY.f=0 : ANGLEZ.f=0
CAMX.f=0 : CAMY.f=0 : CAMZ.f=600
MODE=1  : MOVEX.f=0 : MOVEY.f=0 : MOVEZ.f=0
PIVX.f=0 : PIVY.f = 0 : PIVZ.f = 0
max=8

Dim X(max)
Dim Y(max)
Dim Z(max)
Dim PreVal(8,8,8)

X(1)=I  :  Y(1)=I  :  Z(1)=-I
X(2)=I  :  Y(2)=I  :  Z(2)=I
X(3)=I  :  Y(3)=-I :  Z(3)=-I
X(4)=I  :  Y(4)=-I :  Z(4)=I
X(5)=-I :  Y(5)=I  :  Z(5)=-I
X(6)=-I :  Y(6)=I  :  Z(6)=I
X(7)=-I :  Y(7)=-I : Z(7)=-I
X(8)=-I :  Y(8)=-I :  Z(8)=I

Repeat
 
  ANGLEX+0.001
  ANGLEY+0.001
  ANGLEZ+0.001
 
  ClearScreen(0)
 
  For n=1 To 4
   
    XD.f = X(N)-PIVX
    YD.f = Y(N)-PIVY
    ZD.f = Z(N)-PIVZ
   
    ZX.f = XD*Cos(ANGLEZ) - YD*Sin(ANGLEZ) - XD
    ZY.f = XD*Sin(ANGLEZ) + YD*Cos(ANGLEZ) - YD
   
    YX.f = (XD+ZX)*Cos(ANGLEY) - ZD*Sin(ANGLEY) - (XD+ZX)
    YZ.f = (XD+ZX)*Sin(ANGLEY) + ZD*Cos(ANGLEY) - ZD
   
    XY.f = (YD+ZY)*Cos(ANGLEX) - (ZD+YZ)*Sin(ANGLEX) - (YD+ZY)
    XZ.f = (YD+ZY)*Sin(ANGLEX) + (ZD+YZ)*Cos(ANGLEX) - (ZD+YZ)
   
    XROTOFFSET.f = YX+ZX
    YROTOFFSET.f = ZY+XY
    ZROTOFFSET.f = XZ+YZ
   
   
    If MODE=0
     
      X = ( X(N) + XROTOFFSET + CAMX ) /SCALE +MOVEX
      Y = ( Y(N) + YROTOFFSET + CAMY ) /SCALE +MOVEY
     
     
    Else
     
      Z= (Z(N) + ZROTOFFSET + CAMZ)
      X= (X(N) + XROTOFFSET + CAMX) /Z /SCALE +MOVEX
      Y= (Y(N) + YROTOFFSET + CAMY) /Z /SCALE +MOVEY
     
    EndIf
   
    If MODE=0
     
      DisplayTransparentSprite(ball,X+300,Y+200)
     
    Else
      Z= ( Z(N) + ZROTOFFSET + CAMZ)
     
      a=(SIZE /Z /SCALE)*6
      ZoomSprite(ball_spr, a,a)
     
      DisplayTransparentSprite(ball_spr,X+300,Y+200)
    EndIf
   
  Next
 
  FlipBuffers()
 
 
  ExamineKeyboard()
 
  If KeyboardPushed(#PB_Key_Left)
    MOVEX-0.1
  EndIf
  If KeyboardPushed(#PB_Key_Right)
    MOVEX+0.1
  EndIf
  If KeyboardPushed(#PB_Key_Up)
    MOVEY-0.1
  EndIf
  If KeyboardPushed(#PB_Key_Down)
    MOVEy+0.1
  EndIf 
  If KeyboardPushed(#PB_Key_LeftBracket)
    SCALE = SCALE*1.02
  EndIf 
  If KeyboardPushed(#PB_Key_RightBracket)
    SCALE = SCALE/1.02
  EndIf
 
  If KeyboardPushed(#PB_Key_1)
    ANGLEZ-0.01
  EndIf 
  If KeyboardPushed(#PB_Key_2)
    ANGLEZ+0.01
  EndIf 
  If KeyboardPushed(#PB_Key_3)
    ANGLEY+0.1
  EndIf   
  If KeyboardPushed(#PB_Key_4)
    ANGLEY+0.1
  EndIf   
  If KeyboardPushed(#PB_Key_5)
    ANGLEX+0.1
  EndIf   
  If KeyboardPushed(#PB_Key_6)
    ANGLEX+0.1
  EndIf   
 
  If KeyboardPushed(#PB_Key_F)
    PIVX-0.1
  EndIf
  If KeyboardPushed(#PB_Key_H)
    PIVX+0.1
  EndIf
  If KeyboardPushed(#PB_Key_T)
    PIVY-0.1
  EndIf
  If KeyboardPushed(#PB_Key_G)
    PIVY+0.1
  EndIf
  If KeyboardPushed(#PB_Key_A)
    PIVZ-0.1
  EndIf
  If KeyboardPushed(#PB_Key_S)
    PIVZ+0.1
  EndIf
 
  If KeyboardPushed(#PB_Key_Pad4)
    CAMX-0.1
  EndIf
  If KeyboardPushed(#PB_Key_Pad6)
    CAMX+0.1
  EndIf
  If KeyboardPushed(#PB_Key_Pad8)
    CAMY-0.1
  EndIf
  If KeyboardPushed(#PB_Key_Pad2)
    CAMY+0.1
  EndIf 
  If KeyboardPushed(#PB_Key_Minus)
    CAMZ-0.1
  EndIf
  If KeyboardPushed(#PB_Key_Add)
    CAMZ+0.1
  EndIf
  If KeyboardPushed(#PB_Key_Space)
    If MODE=0
      MODE=1
      SCALE=SCALE /CAMZ
    Else
      MODE=0
      SCALE=SCALE * CAMZ
    EndIf
    Delay(200) 
  EndIf
 
 
  WindowEvent()
 
Until KeyboardPushed(#PB_Key_Escape)


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EndDataSection


[ninogenio]

hi mate,

ideally what you want too do is assuming z=0 equals screen is draw the sprites closest too this point first. you will probably have too separate your drawing code from the transformations. then you will want too create an index buffer the same size as the number of spheres you have.

this index buffer will constantly change depending on what spheres are closest too the screen so initially your buffer might look like this.

Code: [Select]

SphereIndbuffer(0-4) = (1,2,3,4)

this buffer is handy too have as you can see here if we were too draw the spheres using this buffer.

Code: [Select]

for x=1 to 4
          DrawSphere(BallX(SphereIndBuffer(N)),BallY(SphereIndBuffer(N)),Rad)
Next

you can see that the spheres would be drawn in the order of 1,2,3,4 but if the Numbers in the SphereIndBuffer equaled 2,1,4,3 this would change the order the spheres were drawn in.
its really just a cheap and easy way we use too give us control over how the spheres are drawn.

now as too changing the order in the index buffer you would do something like this in the transforms, probably just after rotations. by checking if this z is higher than the previous z then swap them so SphereIndBuffer(N-1) = N and SphereIndBuffer(N) = N - 1 Else SphereIndBuffer(N) = N

and then later on, near you flipbuffer/clear screen you would reset your sphereIndBuffer to 1,2,3,4

by doing this when it comes time too draw they should draw from highest too lowest.

sorry its all pseudo but hopefully it gives you a rough idea as too how too go about things. as for making the points join.. lets get the z order thing working first then we will come back too this. 

[emook]

Yes - I tried doing it with a structure array order(x,y,z) then trying to sort on the z offset, but the results wouldn't work.

Thats the way to go, thank

[ninogenio]

yep if you follow those instructions. this will work as you want.. obviously it was only pseudo so you will have too tweek it here and there slightly.

i know because i have faced this exact same thing many many times in the past and this method always fixed the problem for me.

remeber too split your rendering code out away from the transformations. its very important, as you always want too fully complete you z index list before doing any drawing. if you try and draw things at the same time as sorting it wont work.

ideally you would normally just use framebuffers that way you can use a proper zbuffer and completely occlude the hidden parts of the sprite. but at this point thats overkill