func.h
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	/* RCSid $Id: func.h,v 2.10 2015/05/20 12:58:31 greg Exp $ */
	/*
	* Header file for modifiers using function files.
	*
	* Include after ray.h
	*/
	#ifndef _RAD_FUNC_H_
	#define _RAD_FUNC_H_

	#include "calcomp.h"

	#ifdef __cplusplus
	extern "C" {
	#endif

	#define MAXEXPR 9 /* maximum expressions in modifier */

	typedef struct {
	EPNODE ep[MAXEXPR+1]; / NULL-terminated expression list */
	char ctx; / context (from file name) */
	XF fxp, bxp; /* forward and backward transforms */
	} MFUNC; /* material function */

	extern XF unitxf; /* identity transform */
	extern XF funcxf; /* current transform */

	extern void initfunc(void);
	extern void set_eparams(char *prms);
	extern MFUNC getfunc(OBJREC m, int ff, unsigned int ef, int dofwd);
	extern void freefunc(OBJREC *m);
	extern int setfunc(OBJREC m, RAY r);
	extern int worldfunc(char ctx, RAY r);
	extern void loadfunc(char *fname);

	/* defined in noise3.c */
	extern void setnoisefuncs(void);

	/* defined in fprism.c */
	extern void setprismfuncs(void);


	#ifdef __cplusplus
	}
	#endif
	#endif /* _RAD_FUNC_H_ */