STLA_IO
Read and Write Routines
ASCII STL 3D Graphics Files

STLA_IO is a FORTRAN90 library which reads or writes the 3D graphics information stored in an ASCII STL (stereolithography) file.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

STLA_IO is available in a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

IVCON, a C++ program which can convert graphics information between ASCII STL and other formats.

IVREAD, a FORTRAN90 program which can convert graphics information between ASCII STL and other formats.

STLA, a data directory which contains some examples of STLA 3D graphics files.

STLA_DISPLAY, a MATLAB program which can read an ASCII STL file and display it on the screen.

Reference:

1. 3D Systems, Inc,
   Stereolithography Interface Specification,
   October 1989.

Source Code:

• stla_io.f90, the source code.

Examples and Tests:

• stla_io_test.f90, a sample calling program.
• cube.stla, a simple STLA file that describes a cube.
• cube_new.stla, an STLA file describing a cube, written by STLA_WRITE.
• stla_io_test.txt, the output file.

List of Routines:

• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• GET_UNIT returns a free FORTRAN unit number.
• R8VEC_CROSS_3D computes the cross product of two vectors in 3D.
• S_CAT concatenates two strings to make a third string.
• S_EQI is a case insensitive comparison of two strings for equality.
• S_TO_R8 reads an R8 from a string.
• STLA_CHECK checks an ASCII StereoLithography file.
• STLA_FACE_NODE_PRINT prints the node indices for each face.
• STLA_FACE_NORMAL_COMPUTE computes normal vectors for an ASCII StereoLithography file.
• STLA_FACE_NORMAL_PRINT prints the normal vectors.
• STLA_NODE_XYZ_PRINT prints the node coordinates.
• STLA_READ reads graphics information from an ASCII StereoLithography file.
• STLA_SIZE determines sizes associated with an STLA file.
• STLA_SIZE_PRINT prints sizes associated with an STLA file.
• STLA_WRITE writes graphics information to an ASCII StereoLithography file.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• WORD_NEXT_READ "reads" words from a string, one at a time.

You can go up one level to the FORTRAN90 source codes.