render to offscreen bitmap - GameCreators Forum

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21

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Joined: 23rd Oct 2002

Location: United States

Posted: 6th Jan 2003 08:10

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I'm probably just missing something very simple but is it possible to do something such as create a new bitmap and/or camera and render to that bitmap instead of the main image on the screen? I'm aware of doing 2D drawing on other bitmaps but how about 3D?

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Darklight

21

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Joined: 23rd Oct 2002

Location: United States

Posted: 6th Jan 2003 08:55

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OK I've been trying the 'Set Camera to Image' command with no luck at all. I keep getting an error to the effect of :
Runtime Error 504 : Cannot grab image due to illegal area at line 63 (or 87)

I don't even have a line 63 or 87!

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MrTAToad

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Posted: 6th Jan 2003 13:03

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Look elsewhere for a GET IMAGE-like command...

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!

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firestarter

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Posted: 6th Jan 2003 13:46

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Create Bitmap 1, Screen width(), Screen height()
Set Current Bitmap 1

Do your rendering stuff

Get Image 1, 0, 0, Screen width(), Screen height()
Set current bitmap 0

Paste Image 1, 0, 0

-------------------------------

I don`t know if this work.

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MrTAToad

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Posted: 6th Jan 2003 14:27

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Try

+ Code Snippet

Get Image 1, 0, 0, Screen width()-1, Screen height()-1

Like the other 2D commands, the documentation doesn't specify a) whether the top left corner is 0,0 or 1,1 and b) it doesn't specify whether the end values are inclusive or exclusive...

I think for a) its the former and b) the latter.

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!

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IanM

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Posted: 6th Jan 2003 14:43

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Correct

In which case, your get image code will not include the last row or column of the display

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firestarter

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Posted: 6th Jan 2003 17:58

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Hmm, i tried to create a texture out of some 3d render and put the texture on a 3d object (that looks the same as the 3d render). But the result was kinda weird, the 3d object that i want to rotate doesnt rotate it seems like.
Check the weird result yourself.

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()
SET CURRENT BITMAP 1
MAKE OBJECT CUBE 1, 100
REM POSITION OBJECT 1, 0, 0, 0
GET IMAGE 1, 0, 0, SCREEN WIDTH()-1, SCREEN HEIGHT()-1

SET CURRENT BITMAP 0
MAKE OBJECT CUBE 2, 100
TEXTURE OBJECT 2, 1

DO

XROTATE OBJECT 2, OBJECT ANGLE X(2)+0.2
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+0.2

REM PASTE IMAGE 1,0,0
SYNC

LOOP

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ICERGB

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Posted: 6th Jan 2003 21:57

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I hace a real problem with the "get image" command

I think for sure it is buggy as all HELL

Your weird effect is because it copied a black screen to the cube.

Why doesn't this work?

+ Code Snippet

rem BACKDROP ON
COLOR BACKDROP rgb(0,0,0) : SYNC ON : HIDE MOUSE


rem SET CURRENT BITMAP 1
MAKE OBJECT CUBE 1, 100


sw=screen width()-1
sh=screen height()-1
CREATE BITMAP 1,sw,sh
set current bitmap 1

GET IMAGE 1,0,0,sw,sh,1

rem SET CURRENT BITMAP 0
MAKE OBJECT CUBE 2,100
TEXTURE OBJECT 2,1

DO

XROTATE OBJECT 2,OBJECT ANGLE X(2)+0.9
YROTATE OBJECT 2,OBJECT ANGLE Y(2)+0.9

rem PASTE IMAGE 1,0,0
SYNC

LOOP

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rapscaLLion

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Posted: 6th Jan 2003 22:47

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When you sync, DB will render to the current Bitmap. If the current bitmap is 0, it will render to the screen. So create a bitmap the size of the screen, and set the bitmap to the new bitmap number. Then sync the screen, change the bitmap number to 0, and all your other stuff.

ICERGB- Your code copies a black bitmap to the image because you didn't sync.
Try something like this:

+ Code Snippet

rem BACKDROP ON
COLOR BACKDROP rgb(0,0,0) : SYNC ON : HIDE MOUSE


rem SET CURRENT BITMAP 1
MAKE OBJECT CUBE 1, 100


sw=screen width()-1
sh=screen height()-1
CREATE BITMAP 1,sw,sh
set current bitmap 1

SYNC

GET IMAGE 1,0,0,sw,sh,1

rem SET CURRENT BITMAP 0
MAKE OBJECT CUBE 2,100
TEXTURE OBJECT 2,1

DO

XROTATE OBJECT 2,OBJECT ANGLE X(2)+0.9
YROTATE OBJECT 2,OBJECT ANGLE Y(2)+0.9

rem PASTE IMAGE 1,0,0
SYNC

LOOP

Alex Wanuch
aka rapscaLLion
Kousen Dev Progress >> Currently Working On Editors

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firestarter

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Posted: 6th Jan 2003 23:55

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I GOT IT

))))) Wasn`t much to adjust, thanks ICERGB and rapscaLLion!!!

Here is the code:

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()
SET CURRENT BITMAP 1
MAKE OBJECT CUBE 1, 100
REM POSITION OBJECT 1, 0, 0, 0
SYNC
GET IMAGE 1, 0, 0, SCREEN WIDTH()-1, SCREEN HEIGHT()-1
HIDE OBJECT 1

SET CURRENT BITMAP 0
MAKE OBJECT CUBE 2, 100
TEXTURE OBJECT 2, 1

DO

XROTATE OBJECT 2, OBJECT ANGLE X(2)+0.2
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+0.2

REM PASTE IMAGE 1,0,0
SYNC

LOOP

I wonder if i could animate my texture so i could have spinning cubes on the surface of my spinning cube

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firestarter

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Posted: 6th Jan 2003 23:59

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Changed the backdrop colors for each bitmap so the cube is more distinct.

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()
SET CURRENT BITMAP 1
COLOR BACKDROP 100
MAKE OBJECT CUBE 1, 100
REM POSITION OBJECT 1, 0, 0, 0
SYNC
GET IMAGE 1, 0, 0, SCREEN WIDTH()-1, SCREEN HEIGHT()-1
HIDE OBJECT 1

SET CURRENT BITMAP 0
MAKE OBJECT CUBE 2, 100
TEXTURE OBJECT 2, 1

COLOR BACKDROP 0
DO

XROTATE OBJECT 2, OBJECT ANGLE X(2)+0.2
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+0.2

REM PASTE IMAGE 1,0,0
SYNC

LOOP

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firestarter

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Posted: 7th Jan 2003 00:11

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Extremely slow code, but it works in some way.
Any thoughts on how to do it in a much more efficient way?

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()

MAKE OBJECT CUBE 1, 100
REM POSITION OBJECT 1, 0, 0, 0
HIDE OBJECT 1

MAKE OBJECT CUBE 2, 100
REM TEXTURE OBJECT 2, 1
REM HIDE OBJECT 2

DO

SET CURRENT BITMAP 1
COLOR BACKDROP 100
XROTATE OBJECT 1, OBJECT ANGLE X(1)+2.8
YROTATE OBJECT 1, OBJECT ANGLE Y(1)+2.8
SHOW OBJECT 1
SYNC
HIDE OBJECT 1
GET IMAGE 1, 0, 0, SCREEN WIDTH()-1, SCREEN HEIGHT()-1
SET CURRENT BITMAP 0
COLOR BACKDROP 0
REM SHOW OBJECT 2
TEXTURE OBJECT 2, 1
XROTATE OBJECT 2, OBJECT ANGLE X(2)+2.8
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+2.8
SYNC

REM PASTE IMAGE 1,0,0
SYNC

LOOP

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ICERGB

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Posted: 7th Jan 2003 02:53

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Well I'll be...

Make me feel small

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firestarter

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Joined: 26th Dec 2002

Location: Norway

Posted: 7th Jan 2003 02:58

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A small update (the hide/show object command wasnt correctly in my last code).

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()

MAKE OBJECT CUBE 1, 100
REM POSITION OBJECT 1, 0, 0, 0
HIDE OBJECT 1


MAKE OBJECT CUBE 2, 100
REM TEXTURE OBJECT 2, 1
REM HIDE OBJECT 2
HIDE OBJECT 2

DO

SET CURRENT BITMAP 1
SHOW OBJECT 1
COLOR BACKDROP 200
XROTATE OBJECT 1, OBJECT ANGLE X(1)+2.8
YROTATE OBJECT 1, OBJECT ANGLE Y(1)+2.8

SYNC
HIDE OBJECT 1
SHOW OBJECT 2


GET IMAGE 1, 0, 0, SCREEN WIDTH()-1, SCREEN HEIGHT()-1
SET CURRENT BITMAP 0

COLOR BACKDROP 0

TEXTURE OBJECT 2, 1
XROTATE OBJECT 2, OBJECT ANGLE X(2)+2.8
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+2.8
SYNC
HIDE OBJECT 2
REM PASTE IMAGE 1,0,0

LOOP

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firestarter

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Joined: 26th Dec 2002

Location: Norway

Posted: 7th Jan 2003 15:38

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Ok, here is a code that is "smooth". Now the image is 256*256 in size and not the whole screen (less processing now). Enjoy the cube

+ Code Snippet

Rem Project: ScreenToBitmap
Rem Created: 06.01.2003 15:20:52

Rem ***** Main Source File *****
BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()

MAKE OBJECT CUBE 1, 50
REM POSITION OBJECT 1, 0, 0, 0
HIDE OBJECT 1


MAKE OBJECT CUBE 2, 100
REM TEXTURE OBJECT 2, 1
REM HIDE OBJECT 2
HIDE OBJECT 2

DO

SET CURRENT BITMAP 1
SHOW OBJECT 1
COLOR BACKDROP 200
XROTATE OBJECT 1, OBJECT ANGLE X(1)+2.8
YROTATE OBJECT 1, OBJECT ANGLE Y(1)+2.8

SYNC
HIDE OBJECT 1
SHOW OBJECT 2


GET IMAGE 1, (SCREEN WIDTH()/2)-128, (SCREEN HEIGHT()/2)-128, SCREEN WIDTH()-(SCREEN WIDTH()/2)+128, SCREEN HEIGHT()-(SCREEN HEIGHT()/2)+128
SET CURRENT BITMAP 0

COLOR BACKDROP 0

TEXTURE OBJECT 2, 1
XROTATE OBJECT 2, OBJECT ANGLE X(2)+2.8
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+2.8
SYNC
HIDE OBJECT 2
REM PASTE IMAGE 1,0,0

LOOP

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firestarter

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Location: Norway

Posted: 7th Jan 2003 15:46

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And ofcourse we can do it more stunning with allowing the cube to be mapped onto the cube that is mapped onto the main cube and so on. Cool effect ain`t it?

+ Code Snippet

BACKDROP ON : COLOR BACKDROP 0 : SYNC ON : HIDE MOUSE

CREATE BITMAP 1, SCREEN WIDTH(), SCREEN HEIGHT()

MAKE OBJECT CUBE 1, 50
REM POSITION OBJECT 1, 0, 0, 0
REM HIDE OBJECT 1


MAKE OBJECT CUBE 2, 100
REM TEXTURE OBJECT 2, 1
REM HIDE OBJECT 2
REM HIDE OBJECT 2

DO

SET CURRENT BITMAP 1
REM SHOW OBJECT 1
COLOR BACKDROP 200
XROTATE OBJECT 1, OBJECT ANGLE X(1)+2.8
YROTATE OBJECT 1, OBJECT ANGLE Y(1)+2.8

SYNC
REM HIDE OBJECT 1
REM SHOW OBJECT 2


GET IMAGE 1, (SCREEN WIDTH()/2)-128, (SCREEN HEIGHT()/2)-128, SCREEN WIDTH()-(SCREEN WIDTH()/2)+128, SCREEN HEIGHT()-(SCREEN HEIGHT()/2)+128
SET CURRENT BITMAP 0

COLOR BACKDROP 0

TEXTURE OBJECT 2, 1
XROTATE OBJECT 2, OBJECT ANGLE X(2)+2.8
YROTATE OBJECT 2, OBJECT ANGLE Y(2)+2.8
SYNC
REM HIDE OBJECT 2
REM PASTE IMAGE 1,0,0

LOOP

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Richard Davey

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Posted: 9th Jan 2003 19:31

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Nice

Cheers,

Rich

"Gentlemen, we are about to short-circuit the Universe!"
DB Team / Atari ST / DarkForge / Retro Gaming

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DarkBASIC Professional Discussion / render to offscreen bitmap