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Newcomers DBPro Corner / Placing a 3D Plain on the Screen (Lock Object On)

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Sixty Squares
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Posted: 7th Oct 2008 03:21
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Sorry if this has been asked before, but I've always been perplexed by this.

How can one know exactly where an object such as a plain will go when it is placed on the screen using LOCK OBJECT ON? I use position object, and I usually get it where I want it via trial and error. Is there a better way? Also, is there a way to get a plain to fit perfectly over the entire screen reguardless of the user's screen resolution?

Thanks for any help,
-Sixty Squares

Snow Demo
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Dabbler
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Posted: 7th Oct 2008 14:08
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Try looking here:

http://forum.thegamecreators.com/?m=forum_view&t=42508&b=6

I hope it helps.


Whatever...
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IanM
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Posted: 7th Oct 2008 22:41
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Quote: "Also, is there a way to get a plain to fit perfectly over the entire screen reguardless of the user's screen resolution?"

Yes.

Use cloggy's method, or this code using LOCK OBJECT ON:


[b]Utility plug-ins collection (updated 27/09/08) and
http://www.matrix1.demon.co.uk
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Sixty Squares
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Posted: 8th Oct 2008 00:12 Edited at: 8th Oct 2008 00:12
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Thank you both for responding. I can't test them right this moment, but if I have any questions on this I'll report back here. I can now resume my toying around with DBP .

Snow Demo
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BatVink
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Posted: 8th Oct 2008 01:23
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This is an easy method. Don't worry about the details, it just works. Assuming the camera is at 0,0,0 when you place the objects, calculate the Z position:

z# = (screen height() / 2.0) / tan(FOV * 0.5)

FOV is the field of vision. If you haven't changed it (SET CAMERA FOV()), then the default value is 61.9621353149

At this distance, your plains are 1 unit / pixel. So, a 3D plain of size 50x50 is actually 50x50 pixels on screen. 0,0 (X,Y) is the centre of the screen.

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HowDo
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Posted: 8th Oct 2008 23:05
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I thought is was that when lock object was use x,y 0,0 was in the top right hand corner of the lock screen, and you worked it out from there.

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BatVink
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Posted: 9th Oct 2008 11:01
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No, Lock object doesn't change 3D coordinates. Then you would simply call them Sprites, which we already have

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