@Puybaret

It would be better to reuse the DLLs available in Sweet Home 3D in your plug-in, but then you'll get the error you reported. As removing these DLLs from your plug-in will prevent it to work with older versions of Sweet Home 3D, I think it's better to keep them with your plug-in for the moment.

Indeed, it is more practical to keep the YafarayRendering-1.4.5 plug-in dlls otherwise it would have been necessary to create a version derived from SweetHome3D-7.0.
A question that has nothing to do. How to modify the luminosity of the sky (color or texture) as it is already the case for the ground with Java3D (3D view)?