From: flupke <schawat AT club-internet DOT fr>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Problems with Allegro's texturemapping
Date: Wed, 15 Jul 1998 14:24:50 +0200
Organization: Grolier Interactive Europe
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Timo Asikainen wrote:

> I'm programming a landscape engine for a game. The method I use is
> simple:
>
> I have a mesh in which all vertices have a height. These vertices are
> connected to each other by lines which form triangles.
>
> (Here's a nice ASCII pic:-))
>
> +-+-+-+
> |\|\|\|
> +-+-+-+
> |\|\|\|<---- a triangle
> +-+-+-+<-----a vertex
>
> Now, what I try to do is texturemap these triangles. I want to
> texturemap them so that I can map a big photograph of for example grass
> or rock onto this landscape. Or if the texture is a small one (for
> example 64x64) I could tile it on the landscape. The problem is that in
> Allegro I have to calculate proper texturemap coords. for each vertex of
> a triangle and I don't know any good algorithm for calculating the
> texmap coords. so that I could achieve what I want to do.
>
> If anyone knows any good netsites on the subject or have some good
> algorithms please let me know about them..

Try the rule of three...