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struct matrix {
flt xx, xy, xz, xt;
flt yx, yy, yz, yt;
flt zx, zy, zz, zt;
};
void apply_to_point(struct matrix * m, struct point * p,
/*out*/ struct point * r);
void apply_to_vect(struct matrix * m, struct vector * v,
/*out*/ struct vector * r);
extern struct matrix * mid;
struct matrix * mtranslate(flt sx, flt sy, flt sz);
struct matrix * mscale(flt sx, flt sy, flt sz);
struct matrix * mrotatex(flt a);
struct matrix * mrotatey(flt a);
struct matrix * mrotatez(flt a);
struct matrix * mcompose(struct matrix * m, struct matrix * n);
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