问题
I am using IfcProduct.Transform() method to obtain the transformation matrix (XbimMatrix3D instance) and using that to do conversions between relative and absolute placements.
But I am not able to find those functions in Ifc4 namespace! I am not able to find anything else that is meant to substitute these functions. This issue has been highlighted here too: https://github.com/xBimTeam/XbimGeometry/issues/103, but there is no response. Please help!
回答1:
It looks like this all got refactored in the IFC4 updates so that transforms on IfcObjectPlacements are handled in Xbim.Geometry.Engine against interfaces in Xbim.Ifc4.Interfaces
I'd take a look at https://github.com/xBimTeam/XbimGeometry/blob/08920df29f909dde0c4f65c63d80ae0b5540025f/Xbim.Geometry.Engine.Interop/XbimGeometryEngine.cs#L442
来源：https://stackoverflow.com/questions/50339650/cannot-find-ifcproduct-transform-method-in-ifc4-namespace-xbim-essentials