papercraft/corners.c
2015-02-15 12:48:25 -05:00

110 lines
2.3 KiB
C

/** \file
* Generate an OpenSCAD with connectors for each face.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <math.h>
#include <err.h>
#include <assert.h>
#include "v3.h"
#include "stl_3d.h"
int
main(void)
{
stl_3d_t * const stl = stl_3d_parse(STDIN_FILENO);
if (!stl)
return EXIT_FAILURE;
const double thickness = 6;
const double offset = 8;
// for each vertex, find the coplanar triangles
// \todo: do coplanar bits
for(int i = 0 ; i < stl->num_vertex ; i++)
{
const stl_vertex_t * const v = &stl->vertex[i];
const v3_t origin = v->p;
printf("// vertex %d\n"
"translate([%f,%f,%f])\n"
"//render() difference()\n"
"{\n"
"sphere(r=20);\n",
i, origin.p[0], origin.p[1], origin.p[2]);
for (int j = 0 ; j < v->num_face; j++)
{
const stl_face_t * const f = v->face[j];
v3_t v0 = v3_sub(f->vertex[0]->p, origin);
v3_t v1 = v3_sub(f->vertex[1]->p, origin);
v3_t v2 = v3_sub(f->vertex[2]->p, origin);
v3_t n;
// compute normal of the face
if (v->face_num[j] == 0)
n = v3_cross(v1, v2);
else
if (v->face_num[j] == 1)
n = v3_cross(v2, v0);
else
if (v->face_num[j] == 2)
n = v3_cross(v0, v1);
n = v3_scale(n, (thickness+1)/v3_mag(n)/2);
// slide the vectors towards the center
v3_t v0mid = v3_scale(v3_mid(v0, v1, v2), offset);
v3_t v1mid = v3_scale(v3_mid(v1, v0, v2), offset);
v3_t v2mid = v3_scale(v3_mid(v2, v0, v1), offset);
v0 = v3_add(v0, v0mid);
v1 = v3_add(v1, v1mid);
v2 = v3_add(v2, v2mid);
// compute the
v3_t v3 = v3_add(v0, n);
v3_t v4 = v3_add(v1, n);
v3_t v5 = v3_add(v2, n);
v0 = v3_sub(v0, n);
v1 = v3_sub(v1, n);
v2 = v3_sub(v2, n);
printf("polyhedron(\n"
"points=[\n"
"[%f,%f,%f],[%f,%f,%f],[%f,%f,%f],\n"
"[%f,%f,%f],[%f,%f,%f],[%f,%f,%f],\n"
"], %s = ["
" [0,1,2], [3,5,4],"
" [0,2,3], [2,5,3],"
" [0,3,4], [0,4,1],"
" [1,4,5], [1,5,2],"
"]);\n",
v0.p[0], v0.p[1], v0.p[2],
v1.p[0], v1.p[1], v1.p[2],
v2.p[0], v2.p[1], v2.p[2],
v3.p[0], v3.p[1], v3.p[2],
v4.p[0], v4.p[1], v4.p[2],
v5.p[0], v5.p[1], v5.p[2],
#ifdef __linux__
"triangles"
#else
"faces"
#endif
);
//break; // only do one right now
}
printf("}\n");
if (i == 1) break; // only do one right now
}
return 0;
}