However, issue of data-rich 3D DWFxTM files enables the estimator to participate in the collaborative BIM team effort by utilising the database information to automatically generate quantities. Designers can respond to this change by increasing the amount of object data held in the database. However, for estimating or scheduling purposes it will generally be necessary to augment the BIM data with additional measurement from 2D or 3D drawing views, particularly with early design intent models. Therefore a multi-sheet DWFxTM export with a default 3D model view (or series of 3D views each showing different elements) and 2D sheets of all plans, elevations and sections allows the estimator to import dimensions directly from the object properties within the 3D view, then use the 2D sheets to check and augment the quantities. The following tips will help to facilitate data extraction from the DWFxTM. 5.01 Family naming conventions CostX® extracts dimension data (quantities) from the Revit® object properties exported in the DWFxTM file. One of the available extraction options groups and sorts the quantities according to the family naming structure of the model Therefore, a more descriptive family naming convention can greatly improve communication. Default naming minimal detail – Descriptive naming In view of the above, try not to use mass or generic model families for objects in detailed models, and do not group disparate objects into a single mass or generic family, as this severely compromises the usefulness of the output data. Select an appropriate element category for each individual object. Mass naming 5.02 Project Units The quantity of each object type is the cumulative value of the dimensions of each individual object. If the Project Units in Revit® are set to whole numbers, each dimension will be rounded up which will increase the cumulative total. Therefore the Project Units need to be set to two or preferably three decimal places to provide an accurate cumulative total. Set Project to three decimal places
However, issue of data-rich 3D DWFxTM files enables the estimator to participate in the collaborative BIM team effort by utilising the database information to automatically generate quantities. Designers can respond to this change by increasing the amount of object data held in the database. However, for estimating or scheduling purposes it will generally be necessary to augment the BIM data with additional measurement from 2D or 3D drawing views, particularly with early design intent models. Therefore a multi-sheet DWFxTM export with a default 3D model view (or series of 3D views each showing different elements) and 2D sheets of all plans, elevations and sections allows the estimator to import dimensions directly from the object properties within the 3D view, then use the 2D sheets to check and augment the quantities. The following tips will help to facilitate data extraction from the DWFxTM. 5.01 Family naming conventions CostX® extracts dimension data (quantities) from the Revit® object properties exported in the DWFxTM file. One of the available extraction options groups and sorts the quantities according to the family naming structure of the model Therefore, a more descriptive family naming convention can greatly improve communication. Default naming – minimal detail Descriptive naming In view of the above, try not to use mass or generic model families for objects in detailed models, and do not group disparate objects into a single mass or generic family, as this severely compromises the usefulness of the output data. Select an appropriate element category for each individual object. Mass naming 5.02 Project Units The quantity of each object type is the cumulative value of the dimensions of each individual object. If the Project Units in Revit® are set to whole numbers, each dimension will be rounded up which will increase the cumulative total. Therefore the Project Units need to be set to two or preferably three decimal places to provide an accurate cumulative total. Set Project to three decimal places
v1_AU2011_CM4228_Lovegrove_ClassHandout.docx