topic API_3DCutPlanesInfo - how to set coordinates? in Archicad C++ API https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/619529#M9711 <P>I need to build a 3d cross section. I found an example code in the help (APIEnv_Change 3D Cutting Planes ID), but I don't understand - what do the "vertical" and "horizontal" coordinates of the section line mean in the API_3DCutShapeType structure?</P> Wed, 24 Jul 2024 11:56:54 GMT kuvbur 2024-07-24T11:56:54Z API_3DCutPlanesInfo - how to set coordinates? https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/619529#M9711 <P>I need to build a 3d cross section. I found an example code in the help (APIEnv_Change 3D Cutting Planes ID), but I don't understand - what do the "vertical" and "horizontal" coordinates of the section line mean in the API_3DCutShapeType structure?</P> Wed, 24 Jul 2024 11:56:54 GMT https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/619529#M9711 kuvbur 2024-07-24T11:56:54Z Re: API_3DCutPlanesInfo - how to set coordinates? https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/669183#M10492 <P>The doc description is not very useful, but from my tests I found that <STRONG>pa</STRONG>, <STRONG>pb</STRONG>, <STRONG>pc</STRONG> and <STRONG>pd</STRONG>&nbsp;are <STRONG>a</STRONG>, <STRONG>b</STRONG>,<STRONG> c</STRONG> and <STRONG>d</STRONG>&nbsp;from the plane equation <STRONG>a*x + b*y + c*z + d = 0</STRONG>, with <STRONG>{a, b, c} = normal</STRONG>&nbsp;of the plane, and <STRONG>-d</STRONG> being the result of the equation when you apply the plane origin into the equation (<STRONG>x = originX</STRONG>, <STRONG>y = origin</STRONG>Y, <STRONG>z = originZ</STRONG>,&nbsp;<STRONG>a = normalX, b = normalY, c = normalZ</STRONG>).</P> Wed, 09 Jul 2025 13:56:22 GMT https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/669183#M10492 BrunoValads 2025-07-09T13:56:22Z Re: API_3DCutPlanesInfo - how to set coordinates? https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/669200#M10494 <P>Thank you for the advice, I'll try that method.</P> Wed, 09 Jul 2025 16:40:04 GMT https://community.graphisoft.com/t5/Archicad-C-API/API-3DCutPlanesInfo-how-to-set-coordinates/m-p/669200#M10494 kuvbur 2025-07-09T16:40:04Z