2 // Author: Andrey Betenev
3 // Copyright: Open CASCADE 2016
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef _RWStl_Reader_HeaderFile
17 #define _RWStl_Reader_HeaderFile
20 #include <Standard_ReadLineBuffer.hxx>
21 #include <Standard_IStream.hxx>
23 class Message_ProgressRange;
25 //! An abstract class implementing procedure to read STL file.
27 //! This class is not bound to particular data structure and can be used to read the file directly into arbitrary data model.
28 //! To use it, create descendant class and implement methods addNode() and addTriangle().
30 //! Call method Read() to read the file. In the process of reading, the tool will call methods addNode() and addTriangle() to fill the mesh data structure.
32 //! The nodes with equal coordinates are merged automatically on the fly.
33 class RWStl_Reader : public Standard_Transient
35 DEFINE_STANDARD_RTTIEXT(RWStl_Reader, Standard_Transient)
38 //! Default constructor.
39 Standard_EXPORT RWStl_Reader();
41 //! Reads data from STL file (either binary or Ascii).
42 //! This function supports reading multi-domain STL files formed by concatenation
43 //! of several "plain" files.
44 //! The mesh nodes are not merged between domains.
45 //! Unicode paths can be given in UTF-8 encoding.
46 //! Format is recognized automatically by analysis of the file header.
47 //! Returns true if success, false on error or user break.
48 Standard_EXPORT Standard_Boolean Read (const char* theFile,
49 const Message_ProgressRange& theProgress);
51 //! Guess whether the stream is an Ascii STL file, by analysis of the first bytes (~200).
52 //! If the stream does not support seekg() then the parameter isSeekgAvailable should
53 //! be passed as 'false', in this case the function attempts to put back the read symbols
54 //! to the stream which thus must support ungetc().
55 //! Returns true if the stream seems to contain Ascii STL.
56 Standard_EXPORT Standard_Boolean IsAscii (Standard_IStream& theStream,
57 const bool isSeekgAvailable);
59 //! Reads STL data from binary stream.
60 //! The stream must be opened in binary mode.
61 //! Stops after reading the number of triangles recorded in the file header.
62 //! Returns true if success, false on error or user break.
63 Standard_EXPORT Standard_Boolean ReadBinary (Standard_IStream& theStream,
64 const Message_ProgressRange& theProgress);
66 //! Reads data from the stream assumed to contain Ascii STL data.
67 //! The stream can be opened either in binary or in Ascii mode.
68 //! Reading stops at the position specified by theUntilPos,
69 //! or end of file is reached, or when keyword "endsolid" is found.
70 //! Empty lines are not supported and will read to reading failure.
71 //! If theUntilPos is non-zero, reads not more than until that position.
72 //! Returns true if success, false on error or user break.
73 Standard_EXPORT Standard_Boolean ReadAscii (Standard_IStream& theStream,
74 Standard_ReadLineBuffer& theBuffer,
75 const std::streampos theUntilPos,
76 const Message_ProgressRange& theProgress);
80 //! Callback function to be implemented in descendant.
81 //! Should create new node with specified coordinates in the target model, and return its ID as integer.
82 virtual Standard_Integer AddNode (const gp_XYZ& thePnt) = 0;
84 //! Callback function to be implemented in descendant.
85 //! Should create new triangle built on specified nodes in the target model.
86 virtual void AddTriangle (Standard_Integer theN1, Standard_Integer theN2, Standard_Integer theN3) = 0;
88 //! Callback function to be implemented in descendant.
89 //! Should create a new triangulation for a solid in multi-domain case.
90 virtual void AddSolid() {}
93 //! Return merge tolerance; M_PI/2 by default - all nodes are merged regardless angle between triangles.
94 Standard_Real MergeAngle() const { return myMergeAngle; }
96 //! Set merge angle in radians.
97 //! Specify something like M_PI/4 (45 degrees) to avoid merge nodes between triangles at sharp corners.
98 void SetMergeAngle (Standard_Real theAngleRad) { myMergeAngle = theAngleRad; }
100 //! Return linear merge tolerance; 0.0 by default (only 3D points with exactly matching coordinates are merged).
101 double MergeTolerance() const { return myMergeTolearance; }
103 //! Set linear merge tolerance.
104 void SetMergeTolerance (double theTolerance) { myMergeTolearance = theTolerance; }
108 Standard_Real myMergeAngle;
109 Standard_Real myMergeTolearance;