313 lines
6.6 KiB
C
313 lines
6.6 KiB
C
/** \file
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* Generate an OpenSCAD with connectors for each face.
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*
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* This imports the original STL file and then slices the corners
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* off from it.
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* Options are inside only (with face flush on outside)
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* or with a slot for the face (like a corner cap)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <math.h>
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#include <err.h>
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#include <assert.h>
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#include "v3.h"
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#include "stl_3d.h"
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static v3_t avg_x, avg_y, avg_z;
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static void
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print_multmatrix(
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const refframe_t * const ref,
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const int transpose
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)
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{
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printf("multmatrix(m=["
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"[%f,%f,%f,0],"
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"[%f,%f,%f,0],"
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"[%f,%f,%f,0],"
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"[ 0, 0, 0,1]])\n",
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transpose ? ref->x.p[0] : ref->x.p[0],
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transpose ? ref->x.p[1] : ref->y.p[0],
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transpose ? ref->x.p[2] : ref->z.p[0],
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transpose ? ref->y.p[0] : ref->x.p[1],
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transpose ? ref->y.p[1] : ref->y.p[1],
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transpose ? ref->y.p[2] : ref->z.p[1],
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transpose ? ref->z.p[0] : ref->x.p[2],
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transpose ? ref->z.p[1] : ref->y.p[2],
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transpose ? ref->z.p[2] : ref->z.p[2]
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);
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}
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static void
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make_faces(
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const stl_3d_t * const stl,
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const stl_vertex_t * const v,
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const double thickness,
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const double translate,
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const double inset_dist,
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const double hole_dist,
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const double hole_rad,
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const double hole_height
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)
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{
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int * const face_used = calloc(sizeof(*face_used), stl->num_face);
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// generate all of the coplanar polygons at this vertex
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const stl_vertex_t ** const vertex_list = calloc(sizeof(**vertex_list), stl->num_vertex);
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for (int j = 0 ; j < v->num_face; j++)
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{
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// generate the polygon face for this vertex
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const stl_face_t * const f = v->face[j];
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if (face_used[f - stl->face])
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continue;
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const int start_vertex = v->face_num[j];
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const int vertex_count = stl_trace_face(
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stl,
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f,
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vertex_list,
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face_used,
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start_vertex
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);
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refframe_t ref;
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refframe_init(&ref,
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f->vertex[(start_vertex+0) % 3]->p,
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f->vertex[(start_vertex+1) % 3]->p,
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f->vertex[(start_vertex+2) % 3]->p
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);
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avg_x = v3_add(avg_x, ref.x);
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avg_y = v3_add(avg_y, ref.y);
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avg_z = v3_add(avg_z, ref.z);
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// use the transpose of the rotation matrix,
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// which will rotate from (x,y) to the correct
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// orientation relative to this connector node.
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print_multmatrix(&ref, 1);
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printf("{\n");
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// generate the polygon plane
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if (thickness != 0)
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{
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printf("translate([0,0,%f]) linear_extrude(height=%f) polygon(points=[\n",
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translate,
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thickness
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);
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for(int k=0 ; k < vertex_count ; k++)
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{
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double x, y;
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refframe_inset(&ref, inset_dist, &x, &y,
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vertex_list[(k+0) % vertex_count]->p,
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vertex_list[(k+1) % vertex_count]->p,
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vertex_list[(k+2) % vertex_count]->p
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);
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printf("[%f,%f],", x, y);
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}
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printf("\n]);\n");
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}
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// generate the mounting holes/pins
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if (hole_rad != 0)
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{
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for(int k=0 ; k < vertex_count ; k++)
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{
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double x, y;
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refframe_inset(&ref, inset_dist+hole_dist, &x, &y,
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vertex_list[(k+0) % vertex_count]->p,
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vertex_list[(k+1) % vertex_count]->p,
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vertex_list[(k+2) % vertex_count]->p
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);
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printf("translate([%f,%f,%f]) cylinder(r=%f,h=%f, $fs=1);\n",
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x, y, -hole_height/2,
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hole_rad,
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hole_height
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);
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}
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}
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printf("}\n");
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}
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free(face_used);
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free(vertex_list);
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}
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int
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main(
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int argc,
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char ** argv
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)
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{
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if (argc <= 1)
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{
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fprintf(stderr, "Usage: corners file.stl > file-corners.scad\n");
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return -1;
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}
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const char * const stl_name = argv[1];
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int fd = open(stl_name, O_RDONLY);
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if (fd < 0)
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{
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perror(stl_name);
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return -1;
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}
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stl_3d_t * const stl = stl_3d_parse(fd);
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if (!stl)
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return EXIT_FAILURE;
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close(fd);
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printf("module model() {\n"
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"render() difference() {\n"
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"import(\"%s\");\n",
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stl_name
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);
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//printf("%%model();\n");
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const double thickness = 3;
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const double inset_dist = 5;
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const double hole_dist = 5;
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const double hole_rad = 1.25;
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// for face, generate the set of coplanar points that go with it
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int * const face_used
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= calloc(sizeof(*face_used), stl->num_face);
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const stl_vertex_t ** const vertex_list
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= calloc(sizeof(*vertex_list), stl->num_vertex);
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for (int i = 0 ; i < stl->num_face ; i++)
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{
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if (face_used[i])
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continue;
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const stl_face_t * const f = &stl->face[i];
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const int vertex_count = stl_trace_face(
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stl,
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f,
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vertex_list,
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face_used,
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0
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);
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refframe_t ref;
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refframe_init(
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&ref,
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f->vertex[0]->p,
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f->vertex[1]->p,
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f->vertex[2]->p
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);
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// replace the origin with the actual origin
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//ref.origin.p[0] = 0;
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//ref.origin.p[1] = 0;
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//ref.origin.p[2] = 0;
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printf("translate([%f,%f,%f])",
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f->vertex[0]->p.p[0],
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f->vertex[0]->p.p[1],
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f->vertex[0]->p.p[2]
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);
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print_multmatrix(&ref, 0);
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printf("{\n");
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// generate a bolt hole for each non-copolanar corner
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for (int j = 0 ; j < vertex_count ; j++)
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{
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double x, y;
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refframe_inset(
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&ref,
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inset_dist,
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&x,
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&y,
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vertex_list[(j+0) % vertex_count]->p,
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vertex_list[(j+1) % vertex_count]->p,
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vertex_list[(j+2) % vertex_count]->p
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);
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printf("translate([%f,%f,0]) cylinder(r=%f, h=%f, center=true);\n",
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x,
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y,
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hole_rad,
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10.0
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);
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}
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printf("}\n");
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}
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printf("}\n}\n");
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printf("model();\n");
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#if 0
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for(int i = 0 ; i < stl->num_vertex ; i++)
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{
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const stl_vertex_t * const v = &stl->vertex[i];
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const v3_t origin = v->p;
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// generate screw holes for each face connecting to this corner
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printf("//translate([%f,%f,%f])\n"
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"module vertex_%d() {\n"
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"render() difference()\n"
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"{\n",
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origin.p[0], origin.p[1], origin.p[2], i);
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avg_x.p[0] = avg_x.p[1] = avg_x.p[2] = 0;
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avg_y.p[0] = avg_y.p[1] = avg_y.p[2] = 0;
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avg_z.p[0] = avg_z.p[1] = avg_z.p[2] = 0;
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//printf("render() intersection() {\n");
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printf("union() {\n");
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make_faces(stl, v, thickness, -thickness, 0, 0, 0, 0);
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printf("}\n");
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//printf("}\n");
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printf("union() {\n");
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// slice away the outer bits
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make_faces(stl, v, thickness, 0, -thickness, 0, 0, 0);
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//make_faces(stl, v, thickness, inset_dist, hole_dist, hole_rad);
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printf("}\n");
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// add the screw holes
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make_faces(stl, v, 0, 0, 0, hole_dist, hole_rad, thickness*3);
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printf("} // difference\n");
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printf("}\n");
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refframe_t avg;
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refframe_init(&avg, avg_x, avg_y, avg_z);
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printf("translate([%d,0,12]) render() intersection() {\n", i*30);
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printf("rotate([0,-90,0])");
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print_multmatrix(&avg, 1);
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printf("vertex_%d();\n", i);
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printf("cube([100,100,24], center=true);\n");
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printf("}\n");
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//break;
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//if (i == 0) break; // only do one right now
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}
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//printf("translate([0,0,20]) sphere(r=2);\n");
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#endif
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return 0;
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}
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