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Convert the white/black elements into a block using the Wblock command. Use the default location for the path and file name for the new block. Accept the default insertion point of 0,0,0. Tick the convert to block icon.
What colour do the white/black items turn into when they are converted to a block?
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Objects which have the property "colour by layer" will adopt the current layer's property colour when converted to a block.
You can think of blocks as belonging to a layer. Blocks will not appear if the block they were created on is frozen for example.
Wblock is similar to the "make block" command except that wblock creates a file.
A typical use of Wblock is to create Xref's as most of the settings required are set as default such as the co-ordinates of x, y and z being 0,0,0
This is necessary for xref's which link data from other drawings. The zero co-ordinates are used to place this data in the correct location.