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/usr/include/tachyon/plane.h is in libtachyon-dev 0.99~b2+dfsg-0.4.

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/* 
 * plane.h - This file contains the defines for planes etc.
 *
 *  $Id: plane.h,v 1.13 2011/02/05 08:10:11 johns Exp $
 */

 
object * newplane(void * tex, vector ctr, vector norm);

#ifdef PLANE_PRIVATE
typedef struct {
  RT_OBJECT_HEAD
  flt d;            /**< plane distance along normal */
  vector norm;      /**< surface normal              */
} plane; 

static void plane_intersect(const plane *, ray *);
static int plane_bbox(void * obj, vector * min, vector * max);
static void plane_normal(const plane *, const vector *, const ray * incident, vector *);
#endif