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This week's tip is for our advanced
users who use 3D. Did
you know that there is a fifth dimension in your 3D files?
Yes, a fifth dimension. The fourth
dimension would be movement or animation and the fifth deals with the
relative position of a block's origin.
An example of this is when a block definition is created
and the entities are floating above or below the Z level of the origin
point. If the base point of the block is moved to a Z elevation of 0
(zero), the objects can still be floating above or below that zero plane.
This occasionally bewilders users as to where the actual Z plane of the
objects resides. Try to move individual objects to a different Z
plane when editing them with REFEDIT and everything looks OK, but when you
move the block insertion point back to zero, all the editing seems to go
away because of the relative relationship to the block base point, not the WCS Z plane.
The best way to avoid getting all
mixed up with different relative elevations verses World elevations is to set the block insertion
point on the lowest Z point of the block geometry, not floating in
space. A simple guide to use for 3D blocks is to never use 0,0,0 as a
base point for 3D objects if they do not share geometry with that point. |
