![]() ![]() To do that move pointer on each property and in context menu set "Read-only" and finally uncheck "Show all". Now set Density, Volume and Mass as a "Read-only" properties to not mistakenly modify it in the future.Now add new property for Volume (see previous steps), but for this time use next Type:. ![]() * 1 kg/m^3 (multiply by one kilogram ) is used to set units of Density input value as kg/m^3 (as said, FreeCAD internally uses g/mm^3 units for App::PropertyDensity, so this part of the expression is used just for simplify entering real density values listed in catalogs in kg/m^3). ![]() 0 (zero) is the last "FALSE" value in these sequence added just for the case if Material property would not be set or might be broken. ![]() Plain Carbon Steel) materials on the Material property list accordingly
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