Levels & Grids

Grids

• Used mostly for lining things up but elements can be locked to these and are used for construction purposes (unlike reference planes) eg columns etc
• Before you start modelling would be the time to place your grid.
• 2D vs 3D (changes will show only for that specific view vs changes throughout)

Levels eg. sea level (datum level)
To adjust your model relative to sea level (ie. in order to create the correct 'levels'):

• Dimension all your existing levels - Annotate, Aligned, click first level, second, third etc
• then Lock them all so they will move together
• (Remember which elevation you have done this in as will need to unlock afterwards - in case you need to adjust the floor level heights later, will cause all sorts of problems if you don't remember to unlock)
• change the zero default on the ground level mark to eg. 33000 (ie. 33m above sea level).
• repeat these steps for all elevations and sections

NB. if you can't see the model anytime, untick both crop boxes in the properties view

After you have readjusted this to the correct level, remember to go back and unlock the level dimensions in that first one you used.