https://community.graphisoft.com/t5/Archicad-C-API/How-to-get-true-actual-dimensions-of-Library-Parts-placed-and/m-p/690957#M10765 <P>As you've already noted, objects can have varying behaviour than means some functions like&nbsp;<SPAN><EM>ACAPI_LibraryPart_GetParams</EM> don't always return what you want. The same is true for <EM>ACAPI_Element_CalcBounds</EM>, although it works far more often. But sometimes the only way to get reliable bounds for a 3D object is to extract the underlying 3D primitives for the element and calculate the bounds using the list of vertices.</SPAN></P> Mon, 26 Jan 2026 13:24:01 GMT rwessel 2026-01-26T13:24:01Z https://community.graphisoft.com/t5/Archicad-C-API/How-to-get-true-actual-dimensions-of-Library-Parts-placed-and/m-p/690562#M10761 <P>Hi,</P><P>I need to get the <STRONG>real width, depth, and height</STRONG> of GDL Objects.</P><P>My problem is that&nbsp;ACAPI_LibraryPart_GetParams gives A/B values, but these are often not the actual size - the real dimensions are calculated in the GDL script (e.g. using ZZYZX, custom parameters, etc.).</P><P>My Idea was placing the object temporarily at 0° rotation, use ACAPI_Element_CalcBounds, then delete it. Would this give me the correct dimensions?</P><P>&nbsp;</P><P><STRONG>What is the recommended way to get the actual 3D size</STRONG> (width, depth, height) of an Object - both for placed elements and unplaced Library Parts?</P><P>&nbsp;</P><P>ArchiCAD 29, Windows</P><P>Thanks!</P> Thu, 22 Jan 2026 11:30:40 GMT https://community.graphisoft.com/t5/Archicad-C-API/How-to-get-true-actual-dimensions-of-Library-Parts-placed-and/m-p/690562#M10761 til0byte 2026-01-22T11:30:40Z https://community.graphisoft.com/t5/Archicad-C-API/How-to-get-true-actual-dimensions-of-Library-Parts-placed-and/m-p/690957#M10765 <P>As you've already noted, objects can have varying behaviour than means some functions like&nbsp;<SPAN><EM>ACAPI_LibraryPart_GetParams</EM> don't always return what you want. The same is true for <EM>ACAPI_Element_CalcBounds</EM>, although it works far more often. But sometimes the only way to get reliable bounds for a 3D object is to extract the underlying 3D primitives for the element and calculate the bounds using the list of vertices.</SPAN></P> Mon, 26 Jan 2026 13:24:01 GMT https://community.graphisoft.com/t5/Archicad-C-API/How-to-get-true-actual-dimensions-of-Library-Parts-placed-and/m-p/690957#M10765 rwessel 2026-01-26T13:24:01Z