@gokermu
sorry to bother you again but I have another problem related to the material takeoff.
is there a way to get this parameter (see pic) out of speckle?
To extract a material parameter, you first need to get the material quantity of the element. Once you have the material quantity, you can get to its material and eventually extract its parameters. To do this, you can use the Speckle.Revit.Parameters.ToNameValueRecord function on the material parameters, which will give you a record of parameter names and their values. From this record, you can extract the physical parameters of your material, including the Mechanical Density.