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- /******************************************************************
- *
- * Program : Twister.c
- * Purpose : Create twisted objects for the DKB raytracer
- * Created : 12/05/90
- * By : Drew Wells [CIS 73767,1244]
- * Files : Twister.c
- * Compiler: Microsoft C 6.00a
- * Model : Tiny
- * Comments: This simple program used to create the floating twisters in
- * the image "Not a Trace of Reality" a.k.a. Ntreal.gif.
- * It should be compatible with any ANSI C compiler, and is
- * easily modifiable to create more complex shapes by adding
- * code to change the x and z axis rotation and step.
- *
- *
- * Copyright 1990 Drew Wells
- * This copyrighted code is released for non-commercial use only.
- * It may not be sold or used a part of a commercial package.
- * This code may be modified and distributed provided it is done at no
- * cost to the user.
- * Please comment and maintain version list if you modify this code.
- ******************************************************************/
- /* Version
- * 0.01 12/05/90 DW Created program.
- * 1.00 12/26/90 DW Added user input.
- *
- */
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- void show_title(void);
- void get_parameters(void);
- void write_header(char *filename, char *union_name, char *objname);
- void write_quadric(char *objname);
- void write_piece(char *objname,double xpos, double ypos, double zpos,
- double xrot, double yrot, double zrot);
- void write_end(char *filename, char *union_name);
- void err_exit(char *message);
-
- FILE *outfile;
- char object[80],filename[80],union_name[80],workstr[256];
- double length, numtwist, ystep, rstep,xrot,yrot,zrot,x,y,z,numdeg;
- long numpieces;
-
-
-
- main()
- {
- show_title();
-
- /* Get twister values from user */
- get_parameters();
-
- /* Open file for output and write header */
- printf("\n\nCreating DKB data file %s...\n",filename);
- if ((outfile = fopen(filename,"w")) == NULL)
- err_exit("Opening file.");
-
- write_header(filename,union_name, object);
-
- /* Create twister and write each piece to file */
- for(y=0.0;y<=length;y+=ystep){
- write_piece(object,x,y,z,xrot,yrot,zrot);
- yrot += rstep;
- if(yrot>=360.0)
- yrot = yrot - 360.0;
- }
-
- /* Write object end and close file */
- write_end(filename,union_name);
- fclose(outfile);
- printf("\nDKB data file %s created.\n",filename);
- return(0);
- }
-
-
- void show_title(void)
- {
- printf("\n\n\n\n");
- printf("___________________________________________________________________\n\n");
- printf("[ TWISTER V1.00 ]\n");
- printf("This program creates a DKB raytracer data file of a twisted object.\n");
- printf("See TWISTER.doc for more details.\n");
- printf("- DW 12/26/90\n");
- printf("___________________________________________________________________\n");
- }
- void get_parameters(void)
- {
- /* Get twister values from user */
-
- printf("Twister filename? [twist.dat]: ");
- gets(workstr);
- strcpy(filename,workstr);
-
- printf("Union name? [Macaroni]: ");
- gets(workstr);
- strcpy(union_name,workstr);
-
- printf("Quadric name? [Part]: ");
- gets(workstr);
- strcpy(object,workstr);
-
-
- printf("Length of twister? [20.0]: ");
- gets(workstr);
- sscanf (workstr, "%lf", &length);
-
- printf("Number of pieces for twister? [50]: ");
- gets(workstr);
- numpieces = atoi(workstr);
-
- printf("Number of twists? [1.0]: ");
- gets(workstr);
- sscanf (workstr, "%lf", &numtwist);
-
- /* Set up default values */
- if(filename[0]=='\0') strcpy(filename,"twist.dat");
- if(union_name[0]=='\0') strcpy(union_name,"Macaroni");
- if(object[0]=='\0') strcpy(object,"Part");
- if(length==0.0) length = 20.0;
- if(numpieces==0) numpieces = 50;
- if(numtwist==0.0) numtwist = 1.0;
-
- xrot = yrot = zrot = x = y = z = 0.0;
- ystep = length/(double)(numpieces-1);
- rstep = (360.0 * numtwist)/(length/ystep);
- }
-
- void write_header(char *filename, char *union_name, char *objname)
- {
- fprintf(outfile,"{ File : %s Union Name : %s }\n",filename,union_name);
- fprintf(outfile,"{ This data file created by TWISTER for the DKB ray tracer. }\n");
- fprintf(outfile,"{ NOTE: Change quadric '%s' to change the look of '%s' }\n",objname,union_name);
- fprintf(outfile,"{ See TWISTER docs for more details.}\n\n");
- write_quadric(objname);
- fprintf(outfile,"\n{ Twister %s Length=%.3lf Number pieces=%ld Number twists=%.3lf }\n",union_name,length,numpieces,numtwist);
- fprintf(outfile,"DECLARE %s = OBJECT \n UNION\n",union_name);
- }
-
- void write_quadric(char *objname)
- {
- /* Write a sample quadric to file for ease of use */
- fprintf(outfile,"DECLARE %s = QUADRIC Sphere ",objname);
- fprintf(outfile,"SCALE < %.2lf 1.0 1.0 > END_QUADRIC\n",length/4.0);
- }
- void write_piece(char *objname,double xpos, double ypos, double zpos,
- double xrot, double yrot, double zrot)
- {
- char tofile[256];
-
- sprintf(tofile," QUADRIC %s\n ROTATE <%.3lf %.3lf %.3lf> TRANSLATE <%.3lf %.3lf %.3lf>\n END_QUADRIC\n",
- objname,xrot,yrot,zrot,xpos,ypos,zpos);
-
- if( fputs(tofile,outfile) )
- err_exit("Writing string to file.");
-
- }
-
- void write_end(char *filename, char *union_name)
- {
- fprintf(outfile," END_UNION\n TEXTURE COLOR RED 0.9 GREEN 0.1 BLUE 0.1 END_TEXTURE \nEND_OBJECT\n");
- fprintf(outfile,"{ End_File : %s End_Union Name : %s }\n",filename,union_name);
- }
-
- void err_exit(char *message)
- {
- puts("\n\nERROR! \a");
- puts(message);
- puts("- Exiting program\n[Press CR]");
- getchar();
- exit(1);
- }
-