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/* Copyright (c) 1992 The Geometry Center; University of Minnesota
1300 South Second Street; Minneapolis, MN 55454, USA;
This file is part of geomview/OOGL. geomview/OOGL is free software;
you can redistribute it and/or modify it only under the terms given in
the file COPYING, which you should have received along with this file.
This and other related software may be obtained via anonymous ftp from
geom.umn.edu; email: software@geom.umn.edu. */
/* Authors: Charlie Gunn, Stuart Levy, Tamara Munzner, Mark Phillips */
#include "material.h"
#include "3d.h"
/***********************************************************************
* a surf is a primitive bit of surface, conveys the geometrical
* information about an intersection
***********************************************************************/
#define SURF_NEEDS_SET(p, n, s) ((n)&(p) && !((s)&(p)))
#define SURF_SET(p, f) ((f) |= (p))
#define SURF_NONE 0x0
#define SURF_P 0x1
#define SURF_N 0x2
#define SURF_NG 0x4
#define SURF_DPDU 0x8
#define SURF_DPDV 0x10
#define SURF_UV 0x20
#define SURF_DUDV 0x40
#define SURF_ST 0x80
#define SURF_I 0x100
#define SURF_CS 0x200
#define SURF_OS 0x400
typedef struct surf {
int flag ; /* copied mostly from Renderman */
Point3 P ; /* location of the point */
Point3 dPdu ; /* derivatives */
Point3 dPdv ;
Point3 N ; /* shading normal vector */
Point3 Ng ; /* geometric normal */
Point2 uv ; /* location on the surface */
Point2 dudv ; /* derivatives of u, v */
Point2 st ; /* texture coordinates */
Point3 I ; /* incident ray direction */
Material mat;
Transform3 T;
Geom *geom;
} Surf ;
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