Hello,
If you have 3D solid object in autocad and you want to estimate the quantities of FROM-WORKS exactly, pleae follow below
1- if you have columns and beams, please inion the objects by "union solid tool".
2- expolde the object by "explode tool".
3- when you explode any 3d solid in autocad, the edjes of solid will be "region object" not line object, so if you have 3d solid cubic shape and if you explode this cubic you will get for 6 "autocad region objects" which reflects the edjes of cubic. and please remimber don't explode the region objects again.
4- change the view in screen from top to isometric view, and delet the region object in the top and bottom of cubic shape "the edje in top and bottom of cubic which will not contain from-works".
5- go to DATA EXTRACTION TOOL in Autocad, and select the region objects in order to extract them information, one of these information is "AREA OF REGION OBJECT" , then extract the information into EXCEL file, then from excel file you will get the area of region objects.
i have used this method in very complex shape structures, and it is very very useful method, also you can use this methos if you want to estimate the quantities of painting, but remember you need to make your building 3d model in autocad.
Thank you