The location of the STEP file to be read.

The left front bottom and right rear top corners, in global coordinates, of the rectangular volume bounding the tree of geometric objects rooted at this object.

If true, group all trimmed surfaces in the file into one B-rep. If some trimmed surfaces are blanked, they are grouped into a second, blanked B-rep. Default is nil.

Indicates whether the object should effectively be a hidden-object even if specified in :objects. Default is nil.

Points to a pre-existing image file to be displayed instead of actual geometry for this object. Defaults to nil

The left front bottom and right rear top corners, in global coordinates, of the rectangular volume bounding this geometric object.

If true, treat all untrimmed surfaces in the file as if they are trimmed surfaces with the natural outer boundary of the surface as the trimming loop. If used, no standalone IwSurface surface objects will ever be returned by the reader. Default is nil.

If true, group all trimmed surfaces and B-reps in the file into one B-rep. If some trimmed surfaces or B-reps are blanked, they are grouped into a second, blanked B-rep. Default is nil.

This is synonymous with the orientation.

If non-nil, this function gets invoked when the user clicks the object in graphics front-ends which may or may not support this functionality (see viewport-html-div).

The root-level node in this object's ``tree'' (instance hierarchy).

All objects from the :objects specification, including elements of sequences as flat lists. Any children which throw errors come back as a plist with error information

Indicates whether each resulting brep should have its faces sewn together. Default is (the make-single-brep?).

Determines how the name of objects of this type will be printed in most places. This defaults to the name-for-display (generally the part's name as specified in its parent), followed by an index number if the part is an element of a sequence.

Additional objects to display in Tatu tree. Typically this would be a subset of hidden-children. Defaults to NIL.

Indicates in global coordinates where the center of the reference box of this object should be located.

May contain keywords and values indicating display characteristics for this object. The following keywords are recognized currently:

:color

color keyword from the *color-table* parameter, or an HTML-style hexidecimal RGB string value, e.g. "#FFFFFF" for pure white. Defaults to :black.

:line-thickness

an integer, defaulting to 1, indicating relative line thickness for wireframe representations of this object.

:dash-pattern

(currently PDF/PNG/JPEG only). This is a list of two or three numbers which indicate the length, in pixels, of the dashes and blank spaces in a dashed line. The optional third number indicates how far into the line or curve to start the dash pattern.

Z-axis dimension of the reference box. Defaults to zero.

Y-axis dimension of the reference box. Defaults to zero.

Indicates the absolute Rotation Matrix used to create the coordinate system of this object. This matrix is given in absolute terms (i.e. with respect to the root's orientation), and is generally created with the alignment function. It should be an orthonormal matrix, meaning each row is a vector with a magnitude of one (1.0).

X-axis dimension of the reference box. Defaults to zero.

The breps and trimmed surfaces (represented as breps) found in the STEP file.

The curves found in the STEP file.

The points found in the STEP file.

The untrimmed ``standalone'' surfaces found in the STEP file.