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72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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/*
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* solid.c - Data structure and handling of a solid made of two opposing faces
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*
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* Written 2010 by Werner Almesberger
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* Copyright 2010 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "face.h"
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#include "solid.h"
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static void height_field(const char *name, const struct face *f,
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const struct matrix *m)
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{
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FILE *file;
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int x, y;
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int z;
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uint16_t g;
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uint8_t v[2];
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file = fopen(name, "w");
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if (!file) {
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perror(name);
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exit(1);
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}
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fprintf(file, "P5\n%d %d\n65535\n", f->sx, f->sy);
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for (y = 0; y != f->sy; y++)
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for (x = 0; x != f->sx; x++) {
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z = get(f->a, x+f->a->min_x, y+f->a->min_y);
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g = z == UNDEF ? 0 :
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65535*(z-f->a->min_z)/(f->a->max_z-f->a->min_z);
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v[0] = g >> 8;
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v[1] = g;
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fwrite(v, 2, 1, file);
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}
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fclose(file);
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}
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void povray(const struct solid *s)
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{
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struct matrix m;
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m.a[0][0] = m.a[1][1] = 1;
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m.a[0][1] = m.a[1][0] = 0;
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m.b[0] = m.b[1] = 0;
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height_field("top.pgm", s->a, &m);
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height_field("bot.pgm", s->b, &m);
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/*
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* 1/65535 = 0.000015..., so we set the water level a bit lower, e.g.,
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* to 0.0001
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*/
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printf(
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"#declare Part =\n"
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" intersection {\n"
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" height_field { pgm \"top.pgm\" water_level 0.00001 smooth }\n"
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" height_field { pgm \"bot.pgm\" water_level 0.00001 smooth }\n"
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" }\n");
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}
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