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