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Inserting Slab

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Hello. I am trying to understand why when I draw a slab on a Layer that has Z=0 and +-Z=3000, it puts it in at +3000 and not at 0. In the insertion options the Datum offset is 0.

Also when I draw a ceiling (also Datum offset = 0) it puts in at +6000.

I tried a different layer with datum +-Z=2700 and the slab is still put in at +3000.

Where is it getting the +3000 from??

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This doesn't happen when I draw a slab; it comes in at the right elevation. Are you sure you have the correct numbers in the layer's height dialog box?

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If you place a 3d locus (Shift 0) on a corner point on the top-face of the slab is it really at 3000mm?

I remember an issue like this being solved by toggling the document units or re-setting the Z and ΔZ to 0 and back again. You might try that.

It's also possible that your reference datum is at -3000mm.

Can you share a screen-shot of your layer setup?

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In a new drawing, inserting the slab on ground Layer which has Z=0 and Delta Z=0


the slab is NZ 100mm concrete slab - Datum Offset from Layer Z=0


3d locus on same layer inserts at 0.

Not sure how you toggle the document units.

Is there another place for the reference datum, other than in the Slab Preferences?

Screen shot attached

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