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/*
* triangle.h
*
* Copyright (C) 1989, 1991, Craig E. Kolb
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
* $Id$
*
* $Log$
*/
#ifndef TRIANGLE_H
#define TRIANGLE_H
#define FLATTRI 0
#define PHONGTRI 1
#define ObjTriangleCreate(t,a,b,c,d,e,f,g,h,i) ObjCreate( \
(ObjRef)TriangleCreate(t,a,b,c,d,e,f,g,h,i), TriangleMethods())
/*
* Triangle
*/
typedef struct {
Vector nrm, /* triangle normal */
p[3], /* vertices */
e[3], /* "edge" vectors (scaled) */
*vnorm, /* Array of vertex normals */
*dpdu, *dpdv; /* U and V direction vectors */
Float d, /* plane constant */
b[3]; /* Array of barycentric coordinates */
Vec2d *uv; /* Array of UV coordinates of vertices */
char index, /* Flag used for shading/intersection test. */
type; /* type (to detect if phong or flat) */
} Triangle;
extern Triangle *TriangleCreate();
extern int TriangleIntersect(), TriangleNormal();
extern void TriangleBounds(), TriangleUV(),
TriangleStats();
extern Methods *TriangleMethods();
char *TriangleName();
#endif /* TRIANGLE_H */
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