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Description 

BlockDependentViewportDraw = 0x1000 

The drawable has a unique ViewportDraw elaboration for each block path 

HasAttributes = 0x20 

Used in combination with IsCompoundObject, this flag indicates that one or more Attributes will follow the nested objects. If this flag is specified, then the drawable must call WorldGeometry.StartAttributesSegment and send one or more Attributes to the GS at the end of its WorldDraw. Drawables issuing this flag may not use ViewportDraw. 

IsAnEntity = 1 

Entity-derived classes may require some special processing and must return this flag. 

IsCompoundObject = 4 

This flag notifies that graphics system that this object wishes to behave like a block in the display list. It is only valid when combined with the IsAnEntity flag. If you specify this flag, you must also override Entity.CompoundObjectTransform. A compound object has no directly selectable geometry other than the nested objects that it renders via the Geometry.Draw() method. 

IsDimension = 0x85 

Dimensions receive special handling, behaving similarly to blocks but with some differences. This flag is set by the default implementation of Dimension. This flag should not be specified for objects other than dimensions. Its value is made up of IsAnEntity + IsCompoundObject + 128. 

IsExternalReference = 0x2000 

Drawable is an external reference 

IsInvisible = 0x10 

Indicates that this object is invisible and need not be rendered. This flag may also be used to indicate that WorldDraw() and ViewportDraw() are no-ops and may be skipped for optimization purposes. 

None = 0 

Default drawable; just uses primitives and does not use nested calls to Draw(). 

NotPlottable = 0x4000 

Drawable will not be plotted. 

RegenDraw = 0x100 

Instructs the graphics system to always call WorldDraw() and ViewportDraw(), if specified, when redrawing this drawable. This prevents the graphics system from caching the geometry for this drawable. Use this flag only as necessary, as drawables of this type draw much more slowly than if they were cached by the graphics system. 

RegenTypeDependentGeometry = 0x40 

If the geometry you elaborate is dependant on the regentype (for instance, if your drawable draws itself as a set of polygons in a "shaded" regen-mode but as a set of wires in "standard display"), specify this flag. 

ShadedDisplaySingleLOD = 0x400 

Instructs the graphics system that the drawable has a single level of detail for regen type ShadedDisplay. 

StandardDisplaySingleLOD = 0x200 

Instructs the graphics system that the drawable has a single level of detail for regen type StandardDisplay. 

UsesNesting = 2 

Uses nesting but does not send down additional primitives. It uses Draw() exclusively and makes no calls to the other primitives such as circle or shell. An example of this type of drawable would be an BlockTableRecord. 

ViewDependentViewportDraw = 0x800 

The drawable requires ViewportDraw be called on every view change 

ViewIndependentViewportDraw = 8 

Instructs the graphics system that it may cache ViewportDraw geometry. Currently this flag is meaningful only to AutoCAD's 3D Graphics System. Use this flag if the geometry which you render in ViewportDraw() is not dependent on the view configuration, that is, if it does not change when viewed from different positions. The graphics system will then use the cached graphics when the view changes. Do not use this flag if the geometry is to be zoom independent because the cached graphics will change size on screen due to zoom scaling effects. This flag also indicates that WorldDraw() need not be called since all graphics are rendered via ViewportDraw(). ViewportDraw() may be implemented this way if, for instance, you are drawing 3D solids and want to enhance performance by using the 3D Graphics System's caching mechanism. The caching mechanism is disabled for entities that also use WorldDraw().