The left-front-lower and right-rear-upper corners of the axis-aligned bounding box of the object-roots and objects.

The effective view center for the scene contained in this view object. Defaults to the center of the bounding sphere of all the objects in the scene, consisting of the object-roots and the objects.

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.

This plist represents the tightest-fitting sphere around all the objects listed in the object-roots and the objects

The maximum angle of the view frustrum for perspective views. Defaults to 0.1 (which results in a near parallel projection with virtually no perspective effect).

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

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

These objects are not used in computing the scale or centering for the display list. Defaults to nil.

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

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

The leaves of each of these objects will be included in the geometry display. Defaults to nil.

These nodes (not their leaves but the actual objects) will be included in the geometry display. Defaults to 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 support this functionality, e.g. SVG/Raphael and X3DOM.

Front-to-back (or top-to-bottom) length of the paper being represented by this drawing. The default is (* 11 72) points, or 11 inches, corresponding to US standard letter-size paper.

Left-to-right width of the paper being represented by this drawing. The default is (* 8.5 72) points, or 8.5 inches, corresponding to US standard letter-size paper.

This is the normal vector of the view plane onto which to project the 3D objects. Defaults to (getf *standard-views* :top).

Unique ID on the page for the raphael canvas div. By default this is passed in from the base-ajax-graphics-sheet and based on its root-path, but can be specified manually if you are making a web-drawing on your own. Defaults (in the standalone case) to "RaphaelCanvas"

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

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.

These classes will be included in any svg tag outputted from this drawing.

Keys indicate view vector names (e.g. :trimetric), and values contain the 3D vectors. Defaults to the parameter *standard-views*, but with the key corresponding to current (the view) ordered first in the plist. This list of view-vectors is used to construct the default viewpoints.

Each plist contains, based on each entry in the view-vectors, keys:

• :point (camera location, defaults to the 3d-box-center translated along the corresponding element of view-vectors) by the local camera distance. The camera distance is computed based on the field-of-view angle and the bounding-sphere
• :orientation (3d matrix indicating camera orientation)
• field-of-view Angle in degrees of the view frustrum (i.e. lens angle of the virtual camera).

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

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

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.

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).

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

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

This is the actual drawing view which is used to present the geometry. Defaults to an internally-computed object, this should not be overridden in user code.