Does anyone know how to use Allegro's 3D functions. Maybe, just how to draw a polygon and to rotate the camera. Yes, I realize that it isn't the best 3D system, but I would still like to try it out. Thanks!

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Stompy9999

Author

792

January 11, 2005 05:15 PM

I looked at the documentation, and it looks pretty easy, I just don't know how to use the functions in a program.

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23yrold3yrold

941

January 11, 2005 05:38 PM

Allegro comes with some example programs. At least a few are 3D specific.

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Stompy9999

Author

792

January 11, 2005 05:51 PM

I looked at the example code. I understand alot of it, but I don't get why almost every point is declared as "32 << 16".

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23yrold3yrold

941

January 11, 2005 06:06 PM

Ugh. Fixed point. I need to go wash my eyeballs now. [razz]

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Stompy9999

Author

792

January 11, 2005 06:13 PM

I just looked through the documentation again. The bit-shift to 16 is to convert an integer to a fixed point. There apparently is a function called itofix() which is the same as doing this.

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Stompy9999

Author

792

January 11, 2005 06:25 PM

Okay, I understand that to change an integer to a fixed point you need to shift a bit by 16. What I am confused about is what integers to use. Do I have to use factors of 16 or 32?

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23yrold3yrold

941

January 11, 2005 06:28 PM

Nope. These are just vertex coordinates. If the demo you're talking about is what I think it is, the program is just making cubes, so equal measures on all sides would be desirable. [smile] Try changing some numbers, recompile, and see what happens.

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