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Floors are now all relative to the lowest floor and controlled by the floor to floor height. Floor to floor is obviously the important controlling dimension for all of us.
Using the GB Dataset - for Building01 (as delivered) 'Use Relative Elevation' is unticked, then enter the level of the lowest floor and floor heights for each floor starting from the lowest floor. Elevations and Relative Heights are identical.
Floor to floor heights for each floor can then be used to control floor heights with the elevations being calculated accordingly.
Building02 turns on ‘Use Relative Elevation’.
Setting up the floors is the same but the relative elevations are calculated using the offset, the offset value needs to be calculated appropriately depending on the height datum being used before entering it into the dialog.
Note that the offset is relative to 0, so in this example setting Floor 00 to 0 and adding the site datum of 40000 to the height of Floor 00 above the datum the Relative Offset value required to show Floor 00 as 0 is 41500:
as shown in this sketch:
Alternatively, use the site datum of 40000 as the Relative Offset then set B2 to -6500 resulting in Floor 00 having an elevation of 1500. The Relative Elevation of 41500 is the same but the floor heights are expressed treating the site datum as zero.
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