Orthographic camera - GameCreators Forum

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Dmitry K

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Joined: 14th Oct 2002

Location: Russia

Posted: 13th Nov 2004 02:53 Edited at: 13th Nov 2004 02:57

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Orthographic camera in DBPro.
Useful for modeling program.

`*******************************************************************************
`*                         Function SetOrthoCamera()                           *
`*                           Created: 12/11/2004                               *
`*             By: Dmitry K aka DMiTR0S   dmitr0s@newmail.ru                   *
`*******************************************************************************

`*******************************************************************************
`*                            Free License Agreement.                          *
`*                                                                             *
`*   The user/developer agrees to include a visible credit to "Dmitry Kuschev" *
`*   within your programs documentation and or web site.                       *
`*                                                                             *
`*   The user/developer agrees to NOT offer the this source code for Sale.     *
`*                                                                             *
`*   Providing the user/Developer agrees in full to the previous Free          *
`*   License Agreement clauses, the user/developer may use this source         *
`*   code FREELY in all their products, commercial or otherwise.               *
`*                                                                             *
`*******************************************************************************

CameraDll=1
Camera=0

For i=1 To 500
   Make Object Cube i, Rnd(10)
   Position Object i, 500-Rnd(1000), 500-Rnd(1000), 500-Rnd(1000)
   Rotate Object i, Rnd(360), Rnd(360), Rnd(360)
Next i

SetOrthoCamera(CameraDll, Camera)

Sync Rate 0
Sync On
Do
   Control Camera Using ArrowKeys Camera, .1, .1
   Text 10, 10, "Function SetOrthoCamera() by Dmitry Kuschev"
   Sync
Loop

Function SetOrthoCamera(CameraDll, Camera)
   Near#=1.0
   Far#=3000.0
   Width#=Screen Width()*1.0
   Height#=Screen Height()*1.0

Load Dll "DBProCameraDebug.dll", CameraDll
   `Get pointer on internal structure of camera
   CID=Call Dll(1, "?GetInternalData@@YAPAXH@Z", Camera)
   `Get camera Projection matrix
   m00=CID         : m01=CID+4        : m02=CID+8                   : m03=CID+12
   m10=CID+16      : m11=CID+20       : m12=CID+24                  : m13=CID+28
   m20=CID+32      : m21=CID+36       : m22=CID+40                  : m23=CID+44
   m30=CID+48      : m31=CID+52       : m32=CID+56                  : m33=CID+60
   `Replace camera Projection matrix with Ortho matrix
   *m00=2.0/Width# : *m01=0.0         : *m02=0.0                    : *m03=0.0
   *m10=0.0        : *m11=2.0/Height# : *m12=0.0                    : *m13=0.0
   *m20=0.0        : *m21=0.0         : *m22=1.0/(Far#-Near#)       : *m23=0.0
   *m30=0.0        : *m31=0.0         : *m32=1.0*Near#/(Near#-Far#) : *m33=1.0
EndFunction

+ Code Snippet

`*******************************************************************************
`*                         Function SetOrthoCamera()                           *
`*                           Created: 12/11/2004                               *
`*             By: Dmitry K aka DMiTR0S   dmitr0s@newmail.ru                   *
`*******************************************************************************

`*******************************************************************************
`*                            Free License Agreement.                          *
`*                                                                             *
`*   The user/developer agrees to include a visible credit to "Dmitry Kuschev" *
`*   within your programs documentation and or web site.                       *
`*                                                                             *
`*   The user/developer agrees to NOT offer the this source code for Sale.     *
`*                                                                             *
`*   Providing the user/Developer agrees in full to the previous Free          *
`*   License Agreement clauses, the user/developer may use this source         *
`*   code FREELY in all their products, commercial or otherwise.               *
`*                                                                             *
`*******************************************************************************

CameraDll=1
Camera=0

For i=1 To 500
   Make Object Cube i, Rnd(10)
   Position Object i, 500-Rnd(1000), 500-Rnd(1000), 500-Rnd(1000)
   Rotate Object i, Rnd(360), Rnd(360), Rnd(360)
Next i

SetOrthoCamera(CameraDll, Camera)

Sync Rate 0
Sync On
Do
   Control Camera Using ArrowKeys Camera, .1, .1
   Text 10, 10, "Function SetOrthoCamera() by Dmitry Kuschev"
   Sync
Loop


Function SetOrthoCamera(CameraDll, Camera)
   Near#=1.0
   Far#=3000.0
   Width#=Screen Width()*1.0
   Height#=Screen Height()*1.0

   Load Dll "DBProCameraDebug.dll", CameraDll
   `Get pointer on internal structure of camera
   CID=Call Dll(1, "?GetInternalData@@YAPAXH@Z", Camera)
   `Get camera Projection matrix
   m00=CID         : m01=CID+4        : m02=CID+8                   : m03=CID+12
   m10=CID+16      : m11=CID+20       : m12=CID+24                  : m13=CID+28
   m20=CID+32      : m21=CID+36       : m22=CID+40                  : m23=CID+44
   m30=CID+48      : m31=CID+52       : m32=CID+56                  : m33=CID+60
   `Replace camera Projection matrix with Ortho matrix
   *m00=2.0/Width# : *m01=0.0         : *m02=0.0                    : *m03=0.0
   *m10=0.0        : *m11=2.0/Height# : *m12=0.0                    : *m13=0.0
   *m20=0.0        : *m21=0.0         : *m22=1.0/(Far#-Near#)       : *m23=0.0
   *m30=0.0        : *m31=0.0         : *m32=1.0*Near#/(Near#-Far#) : *m33=1.0
EndFunction

Specs: P4 2.4GHz, DIMM 256 266Mhz, 60GB HD 7200rpm ATA-133, GeForce 4 MX440, CD-RW+DVD, WinXP

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Cloggy

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Joined: 31st Oct 2004

Location: Rayleigh, Essex

Posted: 13th Nov 2004 04:10

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Dmitry,

Excellent piece of work. Just what I was looking for. If possible, would you be able to alter it slightly to give me the projection im am trying to get in this post

http://forum.thegamecreators.com/?m=forum_view&t=42563&b=1

I'm sure I just need to fiddle with the numbers a bit. I'll try but I'm sure it's easy for you

Cheers,

Cloggy

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Dmitry K

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Joined: 14th Oct 2002

Location: Russia

Posted: 13th Nov 2004 04:51

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Try this:

Randomize Timer()
CameraDll=1
Camera=0

Sync Rate 0
Sync On
autocam off
position camera -500,500,-500
point camera 0,0,0

make object cube 1,30
position object 1,0,0,0
obj=2
for x=-5 to 5
   for z=-5 to 5
      instance object obj,1
      position object obj,x*45,0,z*45
      inc obj
   next z
next x

SetOrthoCamera(CameraDll, Camera)

Do
   Sync
Loop

Function SetOrthoCamera(CameraDll, Camera)
   Near#=1
   Far#=100000
   Width#=Screen Width()*1.0
   Height#=Screen Height()*1.0

Load Dll "DBProCameraDebug.dll", CameraDll
   `Get pointer on internal structure of camera
   CID=Call Dll(1, "?GetInternalData@@YAPAXH@Z", Camera)
   `Get camera Projection matrix
   m00=CID         : m01=CID+4        : m02=CID+8                   : m03=CID+12
   m10=CID+16      : m11=CID+20       : m12=CID+24                  : m13=CID+28
   m20=CID+32      : m21=CID+36       : m22=CID+40                  : m23=CID+44
   m30=CID+48      : m31=CID+52       : m32=CID+56                  : m33=CID+60
   `Replace camera Projection matrix with Ortho matrix
   *m00=2.0/Width# : *m01=0.0         : *m02=0.0                    : *m03=0.0
   *m10=0.0        : *m11=2.0/Height# : *m12=0.0                    : *m13=0.0
   *m20=0.0        : *m21=0.0         : *m22=1.0/(Far#-Near#)       : *m23=0.0
   *m30=0.0        : *m31=0.0         : *m32=1.0*Near#/(Near#-Far#) : *m33=1.0
EndFunction

+ Code Snippet

Randomize Timer()
CameraDll=1
Camera=0

Sync Rate 0
Sync On
autocam off
position camera -500,500,-500
point camera 0,0,0

make object cube 1,30
position object 1,0,0,0
obj=2
for x=-5 to 5
   for z=-5 to 5
      instance object obj,1
      position object obj,x*45,0,z*45
      inc obj
   next z
next x

SetOrthoCamera(CameraDll, Camera)

Do
   Sync
Loop


Function SetOrthoCamera(CameraDll, Camera)
   Near#=1
   Far#=100000
   Width#=Screen Width()*1.0
   Height#=Screen Height()*1.0

   Load Dll "DBProCameraDebug.dll", CameraDll
   `Get pointer on internal structure of camera
   CID=Call Dll(1, "?GetInternalData@@YAPAXH@Z", Camera)
   `Get camera Projection matrix
   m00=CID         : m01=CID+4        : m02=CID+8                   : m03=CID+12
   m10=CID+16      : m11=CID+20       : m12=CID+24                  : m13=CID+28
   m20=CID+32      : m21=CID+36       : m22=CID+40                  : m23=CID+44
   m30=CID+48      : m31=CID+52       : m32=CID+56                  : m33=CID+60
   `Replace camera Projection matrix with Ortho matrix
   *m00=2.0/Width# : *m01=0.0         : *m02=0.0                    : *m03=0.0
   *m10=0.0        : *m11=2.0/Height# : *m12=0.0                    : *m13=0.0
   *m20=0.0        : *m21=0.0         : *m22=1.0/(Far#-Near#)       : *m23=0.0
   *m30=0.0        : *m31=0.0         : *m32=1.0*Near#/(Near#-Far#) : *m33=1.0
EndFunction

BTW, the object size must be in screen coordinates.

Specs: P4 2.4GHz, DIMM 256 266Mhz, 60GB HD 7200rpm ATA-133, GeForce 4 MX440, CD-RW+DVD, WinXP

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Cloggy

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Joined: 31st Oct 2004

Location: Rayleigh, Essex

Posted: 13th Nov 2004 06:29

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Dmitry,

Thats perfect. If I change the value *m33 I can get the effect of zooming in and out.

I just wish I knew what the matrix values mean. It's one thing changing them and quite another actually understanding them.

Cheers,

Cloggy

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Vai mamar na pila

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Posted: 17th Nov 2004 03:58

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what is an ortographic camera ?

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Jess T

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Location: Over There... Kablam!

Posted: 24th Nov 2004 12:41 Edited at: 24th Nov 2004 12:45

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Dmitry, yet again you have out done yourself.
I personally can use this code a great deal, and for that, I thank you

For those that do not understand the Projection Matrix structure, here is a description on MSDN. It's a bit left of centre if your not used to how a 'Matrix' works, but if you read a couple of times, you may understand it (I'm still trying to

)

http://msdn.microsoft.com/library/en-us/directx9_m/directx/direct3d/gettingstarted/transforms/projection%20transformation/whatisprojectiontransformation.asp

Jess.

Team EOD :: Programmer/All-Round Nice Guy
Aust. Convention!

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David T

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Posted: 25th Nov 2004 00:28

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Dmitry - excellent work! Very clever the way you do it - by calling internal dlls and altering the memory values

Get 15 new commands, all the date / time commands left out of DBPro for free!
DOWNLOAD PLUGINS HERE: http://www.davidtattersall.me.uk/ and select "DarkBasic"

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Mobiius

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Posted: 30th Nov 2004 09:45

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Usefull!

1800+ XP - GeforceFX 5600 - 256MbDDR - 60Gb Hdd - XP Pro (SP2)

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X Trade

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Posted: 30th Nov 2004 23:29

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its cool, works nice

although it was a bit confusing untill i realised that the camera was spinning not sliding across...

i could find this very useful...

is it possible to change the code to make it create a spheremap camera? i know theres probably no chance whatsoever, as far as i understand the camera system... but.. i could be wrong??

www.AoFP.tk

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Dmitry K

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Posted: 3rd Dec 2004 02:53

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Quote: "
is it possible to change the code to make it create a spheremap camera? i know theres probably no chance whatsoever, as far as i understand the camera system... but.. i could be wrong??
"

I tried to find the information on the spheremap camera in internet but unsuccessfully. If I find out the formula of spheremap camera I shall write an example at once.

Specs: P4 2.4GHz, DIMM 256 266Mhz, 60GB HD 7200rpm ATA-133, GeForce 4 MX440, CD-RW+DVD, WinXP

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Maleck

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Posted: 7th Jan 2005 05:11

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I have been using this in a util I was working on and it is doing great. I wanted wireframe orthographic views for adding effects locations to models, and once i figured out that I needed ot turn culling off to see all the wireframe sections, and tweaking it a bit to allow zooming with the mouse wheel, it has been working wonderfully.

Thanks again for putting this together Dmitry.

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Code Snippets / Orthographic camera