Modify ImportInstance Scale Factor

[dwtG8UXF]

Hi there,

Import DWGFile to Revit ,need set  ImportUnit is Millimeter and CustomScale is 0.1, but the API can not set DWGImportOptions (CustomScale and Unit) at the same time. So then want  to modify ImportInstance's Parameter after imported, but element.get_Parameter(BuiltInParameter.IMPORT_INSTANCE_SCALE) is ReadOnly. There is anyway to modify the scale factor use API?

[jeremy_tammik]

What you are attempting to do seems strange to me, even paradoxical. Does this mean that the scale or units in the DWG file are wrong to begin with? Maybe the cleanest approach would be to scale and clean up the DWG file before importing it, and the problem will be moot? Maybe I misunderstand the intended usage of these factors, though.

[RPTHOMAS108 · Accepted solution]

If you get the CADLinkType (ImportInstance.GetTypeId) then it's following parameters:

IMPORT_DISPLAY_UNITS

IMPORT_SCALE

Are both parameters whose ReadOnly state is false so can be set in the API.

They are two scales that can be applied independently one to ensure 1000mm long line in Autocad remains 1000mm in Revit. The other to scale that in proportion to the original (0.5 to make it 500mm long line).

[dwtG8UXF]

At first ,doesn't know the unit of the DWGFile  ,so need to test the right size and put onto the viewsheet. So the right way, import DwgFile with the needed unit,then change the scale. I made wrong way ,  used the wrong parameter to change. But now I understand .

Thank you for your advise .

[dwtG8UXF]

Yes , ImportInstance must convert to CADLinkType , then can change the scale  parameter .

Thanks for your reply .