3D skybox - GameCreators Forum

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TinTin

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Joined: 16th May 2006

Location: BORG Drone Ship - Being Assimilated near Roda Beta (28)

Posted: 8th Oct 2010 22:40

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Hi Guy's it's been a while, but I'm working on a new project and need a little help.

I am trying to create a 3D skybox, not the usual type, an inside out cube with a picture on each face, but a more believable one.

I got the idea from some of the 3d games currently out there. 1st I have a small cube skybox as above which is centered on my skybox camera somewhere of game space. I also have a very simplistic model of a city scaled down to fit in the above skybox. when the player moves in the high detail game area, the skybox camera moves a scaled distance within the low detail city which I intend projecting as a backdrop on the main camera before rendering the high detail game area to it.

Q) Any idea how I can use the output from skybox cam as a backdrop to main cam?

Cyberspace was becoming overcrowded and slummy so I decided to move. These nice chaps gave me a lift.

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Image All

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Joined: 30th Dec 2005

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Posted: 8th Oct 2010 22:50

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well now that u75 re-introduced DBC's texture backdrop command, i think all you would need to do is

+ Code Snippet

set camera to image SECONDCAM, BACKDROPIMG, screen width(),screen height()

texture backdrop FIRSTCAM, BACKDROPIMG

haven't tried it though.

i've also got an idea on how to use only 1 camera. i think i read somewhere a command that could make sure an object was rendered first, putting it behind everything else, useful for skyboxes and the like. if you made it render first, then you could have a really small skybox just around your primary camera and have it look like it's engulfing everything. then you could just position it in relation to your camera the way that you were going to move the secondcam in the skybox in your first method.

Remember those old guys? They made epic renders, I think one of them was called DaVinci, and all they used was MS Paint. Sometimes it's just skill....

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TinTin

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Joined: 16th May 2006

Location: BORG Drone Ship - Being Assimilated near Roda Beta (28)

Posted: 8th Oct 2010 22:53 Edited at: 8th Oct 2010 23:28

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Thanks Image All, didn't realise that the texture backdrop command was back, I'll go give it a try.

Edit: Did a quick test and it's working.

+ Code Snippet

Set display mode 800,600,32
autocam off : Hide mouse : Sync Off
Make Object Cube 1,-100 : Position object 1,0,1000,0
Set Object Light 1,0
For I = 1 to 20
	Make Object Box I+1,(RND(5)+1)*.2,(RND(5)+1)*1,(RND(5)+1)*.2
	Position Object I+1,((RND(4)+1)*20)-50,1000,((RND(4)+1)*20)-50
	Color Object I+1,RGB(128,128,32)
Next

Color Object 1, RGB(0,255,255)
Make Camera 1 : Position Camera 1,0,1000,0
Set Camera to Image 1,1,Screen Width(),Screen Height()
For I = 1 to 20
	Make Object Box I+21,(RND(5)+1)*20,(RND(5)+1)*100,(RND(5)+1)*20
	Position Object I+21,((RND(5)+1)*200)-500,0,((RND(5)+1)*200)-500
	Color Object I+21,RGB(255,128,64)
Next
Do
	Control Camera Using Arrowkeys 0,1,1
	Control Camera Using Arrowkeys 1,.001,1
	Position Object 1,Camera Position X(1),Camera Position Y(1),Camera Position Z(1)
	Texture Backdrop 0,1	
	Sync
Loop

There are 20 light coloured objects being rendered to the main camera and 20 darker smaller objects being rendered to the skybox camera. with proper tinkering I'm sure I'll get the scaling and movement working seamlessly. woohoo!

Cyberspace was becoming overcrowded and slummy so I decided to move. These nice chaps gave me a lift.

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DarkBASIC Professional Discussion / 3D skybox