Could I be so bold as to ask you to give a short description of the functions of the 4 Extents CS' and the three Coordinate System options?
It's one of those things that I think nobody thinks about unless they're in the middle of doing something; in other words, we usually don't remember.
The top half of the menu (the Extents CS) has to do with the orientation of the selector shell that you see around an object that is selected. If you want to see the effects of this you can draw a 3D box (while in an isometric view), then rotate it 15 degrees (or so) in the Z axis. With the object still selected, proceed through the various "Entity CS" options, clicking 'Okay' in between choices. You'll notice how the shell changes in appearance, along with the XYZ handles.
The lower half of the menu concerns the Inspector Bar (what shows up in the text entry boxes, and this is where things get confusing, since the selector shell ("Entity CS") and Inspector bar work differently together, depending on the mixture of settings.
Usually, if you're manipulating objects relative to the default workplane (World CS), you can use World CS/World CS. If you're moving an object relative to itself (say, because it's already been rotated and positioned differently than when it was first created), you can do Entity CS/Extents CS. Or if you need to shift an object in some non-obvious direction, you'll probably need to change the current CS and enable User CS/User CS in the 3D selector menu.
And for a different example, you may want to see how far you rotated that object a few steps back (relative to the default workplane), so you'll use Entity CS/World CS.
Realistically, I won't even remember what I just typed out while I'm building my next 3D TurboCAD model. So, the thing to do is really just trial and error, and you'll eventually find yourself tending toward different things as situations warrant.
« Last Edit: September 06, 2010, 05:52:28 AM by Josh T. »
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