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COMMON LAYER INTERFACE (CLI).pdf
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The Common Layer Interface (CLI) is a universal format for the input of geometry data to model fabrication systems based on layer manufacturing technologies (LMT). It is suitable for systems using layer-wise photo-curing of resin, sintering or binding of powder, cutting of sheet material, solidification of molten material, and any other systems which build models on a layer-by-layer basis.
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(source: https://www.forwiss.uni-passau.de/~welisch/papers/cli_format.html)
COMMON LAYER INTERFACE (CLI)
VERSION 2.0
Introduction
The Common Layer Interface (CLI) is a universal format for the input of geometry data
to model fabrication systems based on layer manufacturing technologies (LMT). It is
suitable for systems using layer-wise photo-curing of resin, sintering or binding of
powder, cutting of sheet material, solidification of molten material, and any other
systems which build models on a layer-by-layer basis.
CLI is intended as a simple, efficient and unambiguous format for data input to all
LMT-based systems, based on a "2 1/2D" layer representation. It is independent of
vendors or fabrication machines, and should require only a simple conversion to the
vendor-specific internal data structure of the machine. The obligatory parts of the
format are also application independent, while the USERDATA command allows user- or
application-specific data to be defined in the header. This flexibility allows the
format to be used for a wide range of applications, without loss of important
information and without excluding data transfer between different applications. One
specific application, medical scan data, is already accommodated with appropriate user
data. Others can be added as they are defined.
Comments and suggestions for future versions are welcome, and should be forwarded to
one of the contacts named in Appendix A.
1. Definitions and general conventions
1.1. 2 1/2D-Representation
The geometrical information of the intersection of a 3D-model with a plane is called a
slice. The volume between two parallel slices is called a layer. The 2 1/2D-
representation of a model is the sum total of layer-descriptions. The slicing plane is
parallel to the xy- plane of a right hand cartesian coordinate system. It is assumed
that the building direction is the positive z-axis.
1.2. Layer
A layer is the volume between two parallel slices, and is defined by its thickness, a
set of contours and (optionally) hatches.
1.3. Contour
Contours represent the boundaries of solid material within a layer, and are defined by
polylines (section 1.4). They are classified as internal and external contours (Fig.1).
For correct interpretation each contour must be closed and must not intersect itself or
another contour.
(Fig 1)
1.4. Polyline
A polyline is defined by a set of vertex points (x,y), connected contiguously in the
listed order by straight line segments. A closed polyline can also be called a polygon.
1.5. Hatches
A hatch is a set of independent straight lines, each defined by one start and one end
point (x,y). The purpose of hatches and open polylines is to define support structures
or filling structures to obtain a solid model, which are necessary for some LMT
systems.
2. ASCII Data Format
2.1. File Structure
The ASCII-file is separated into sections. Each section is marked by a start and an end
marker. Only the characters A...Z, a...z, , ., 0...9, $ and the separators (section
2.4) are interpreted. All other characters will be ignored. Each file must have a
HEADER-section and a GEOMETRY-section. Other sections are optional. The start of the
HEADER-section will be interpreted as the start of data, and the end of the GEOMETRY-
section as the end of data. Data may be included before the HEADER-section and after
the GEOMETRY-section, but will be ignored.
2.2. General Syntax
All commands have the general form:
Keyword/parameter
Keyword and parameter are separated by the character "/" (oblique stroke). If there are
no parameters there should be no oblique stroke. The only exception to this rule is the
command "//" (see description below).
2.2.1. Keywords
Keywords are names according to the language description defined below. All keywords
are written in ASCII upper case notation. Every keyword must start with the sequence
"$$".
2.2.2. Parameters
Parameters are numbers or ASCII-strings separated by the character "," (comma).
2.3. Numbers
INTEGER:
+/- k1...kn : every ki is a number from 0 to 9.
Negative numbers must have a minus sign, positive numbers can have a plus sign. Numbers
with no sign are interpreted as positive. Maximum range is +/- 2^31.
REAL:
+/- x1...xn.y1...ym
n >= 0, m >= 0
1 <= (n + m) <= realim
xi,yi are numbers from 0 to 9, respectively before and after the decimal point. Realim
is the maximum number of digits within a REAL and is limited to 16. A decimal point is
required for all REAL numbers.
2.4. Separators
Separators are "/" (oblique stroke), "," (comma) and "//" (double stroke).
2.5. ASCII-strings
An ASCII-string is any number of valid characters enclosed within double-quotes. Valid
characters are all printable characters except the double-quotes.
3. ASCII Language Description
3.1. Non geometric commands
3.1.1. Comments
Command : remark
Syntax : // text //
This is an exception to the general syntax. The text between the // commands will be
interpreted as a comment. Within the comment the double stroke is not allowed.
3.1.2. Structure
Command : start header
Syntax : $$HEADERSTART
This command starts the HEADER-section, and will be interpreted as the start of data.
___________
Command : end header
Syntax : $$HEADEREND
This command ends the HEADER-section.
___________
Command : start geometry
Syntax : $$GEOMETRYSTART
This command starts the GEOMETRY-section
___________
Command : end geometry (and end data)
Syntax : $$GEOMETRYEND
This command ends the GEOMETRY-section, and will be interpreted as the end of data.
___________
3.1.3. HEADER-Information
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