I think the commonness of its use for such things dates back to the days (pretty long ago now) when it WASN’T POSSIBLE to designate a Layer as non-plotting, and DEFPOINTS was the only one like that. (Besides, you might have occasion to want Dimension definition points turned off or frozen, but not Viewports - then what do you do?) The fact that DEFPOINTS doesn’t plot should be totally irrelevant to anything whatever about Viewports, layout linework, etc., etc. The Layer on which something resides should be meaningful in relation to the purpose of the entity. That’s what should be on it, and not unrelated other things. If they later what to erase them or move them or edit them, they wont be able to do so.Īll very true, but to me, the overriding issue is more one of drafting “philosophy,” namely that the DEFPOINTS Layer is called that for a reason - it’s for DEFinition POINTS for associative Dimension entities. However, you can still double click inside the viewport to adjust the scale but some people use DEFPOINTS for placing other objects that they don’t want to plot like text that serve as notes or whatever. If your viewports are on the DEFPOINTS layer, and you want to later come and change the scale of the viewport, you will not be able to select the viewport. It’s like some sort of force field has been applied to these objects… You will notice that you cant select the objects that are on the DEFPOINTS layer. Now try to select the same layers that were select-able prior to Layer 0 (zero) being frozen.
Let’s say that you Freeze Layer 0 (zero) If layer 0 (zero) is not turned off or frozen, you can select everything as normal (shown below So CAD managers might have Layer 0 (zero) turned off or even frozen so that people don’t use this layer to draw objects that should be on a designated layer. Layer zero is reserved for objects like blocks so if they are set to layer zero and you insert them into a drawing, the current layer could be set to anything, and that block will now be on that layer. Note: I am using “Layer 0 (zero)” because I dont want the zero to be confused as the capital letter O. It has to do with both Layer 0 (zero) and Defpoints. And you may have heard from various posts that you shouldn’t do so but may have not understood why… It may seem like a great idea to use the layer “DEFPOINTS” as the layer for your viewports since it doesn’t plot by default.
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