Path: chuka.playstation.co.uk!news
From: richard.cutting@virgin.net (Richard Cutting)
Newsgroups: scee.yaroze.beginners
Subject: Re: Plotting 2D Boxes in a 3D World
Date: Thu, 14 May 1998 21:10:22 GMT
Organization: PlayStation Net Yaroze (SCEE)
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Thanks Robert,

That works a treat ! I new it had to be something simple in the end
and there was me thinking that I was going to have to bugger about
with matrices and the like.

I have stayed with using boxes for now as I haven't got around to
playing with sprites yet ( well I had a go, but we won't talk about
that ..... ). What I've done is to package up my starfield routines
into a library which is probably completely OTT but now means I can
easily create and animate my starfields with a couple of function
calls.  Its all in my ftp area if anyones interested just check the
web page http://www.netyaroze-europe.com/~rcutting.

Now its back to fixing some of my game logic which I broke the other
day.....sigh......

Richard.
( richard.cutting@virgin.net )

On Thu, 14 May 1998 04:41:30 +0100, Robert Swan <rs108@mdx.ac.uk>
wrote:

>Hi Richard, I was wondering when Id see your presence on here after
>onedotzero...
>I also have to say I think you're progressing pretty darned fast, which
>is nice to see.
>
>What is happening is this -
>normal screen coordinates are (0,0) top left of screen to (320,240)
>bottom right, but when you use initialise the screen for 3d graphics
>with GsInit3D(), then the origin moves to the center of the screen,
>so all you have to do is draw your rectangles from (-160,-120) to
>(160,120)!!
>
>PS, I think from what James Shaugnessy found out that there is a 
>quicker way of drawing one by one dots, and that is to have a 1x1
>pixel large sprite, and use that instead of boxes. You can alter the
>r,g,b member attributes of the GsSPRITEs to get different hued dots.
>Although, thinking about it now, James was not using boxes in the 
>first place, so maybe its worth checking if sprites are faster.
>
>Robert Swan
>rs108@mdx.ac.uk
>http://www.netyaroze-europe.com/~middex2
>
>(btw, you put your web site up at 1am. Im replying to this at 
>4.49am. Im staying up all night at uni (yawn))
>
>Richard Cutting wrote:
>> 
>> I'm writing a 3d shoot em up game and I want the background to be a
>> pretty backdrop of stars.  I've coded the stars as 1 * 1 rectangles
>> which get bunged into the OT using GsSortBoxFill.  They are being
>> displayed but what is happening is that they are all appearing in a
>> small box in the lower right hand corner of the screen. I am assigning
>> each star random co-ordinates using something like x = rand()%320, y =
>> rand()%256.  I know that I have to do something to the co-ordinates to
>> map them into 3d space ( i.e the whole screen ) but I cannot determine
>> what. Can anyone help please !!!