papercraft/stl_3d.h
2015-05-03 15:12:01 -04:00

113 lines
1.8 KiB
C

/** \file
* STL file format.
*
* Parse an STL file into an easily traversed structure.
*/
#ifndef _stl3d_h_
#define _stl3d_h_
#include "v3.h"
typedef struct stl_vertex stl_vertex_t;
typedef struct stl_face stl_face_t;
#define STL_MAX_FACES 64
struct stl_vertex {
v3_t p;
int num_face;
stl_face_t *face[STL_MAX_FACES];
int face_num[STL_MAX_FACES]; // which vertex on the face
};
struct stl_face
{
stl_vertex_t * vertex[3];
stl_face_t * face[3];
double angle[3];
};
typedef struct
{
int num_vertex;
stl_vertex_t * vertex;
int num_face;
stl_face_t * face;
} stl_3d_t;
stl_3d_t *
stl_3d_parse(
int fd
);
/** Generate the list of vertices that are coplanar given a starting
* vertex in the stl file.
*
* vertex_list should have enough space to contain at least as many
* vertices as in the stl file.
*
* if face_used is not null it will be populated with which faces
* have been traversed during the search. it should have enough size
* to contain all of the faces in the file.
*/
int
stl_trace_face(
const stl_3d_t * const stl,
const stl_face_t * const f_start,
const stl_vertex_t ** vertex_list,
int * const face_used,
int start_vertex
);
typedef struct
{
v3_t origin;
v3_t x;
v3_t y;
v3_t z;
} refframe_t;
void
refframe_init(
refframe_t * ref,
const v3_t p0,
const v3_t p1,
const v3_t p2
);
void
refframe_inset(
const refframe_t * const ref,
const double inset_dist,
double * const x_out,
double * const y_out,
const v3_t p0, // previous point
const v3_t p1, // current point to inset
const v3_t p2 // next point
);
/** Project a 3D point onto a 2D space */
void
v3_project(
const refframe_t * const ref,
const v3_t p_in,
double * const x_out,
double * const y_out
);
/** Project a point in a reference frame back into 3D */
v3_t
refframe_project(
const refframe_t * const ref,
const v3_t p
);
#endif