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Here is a snippet working for me

	// convert string to wstring
	std::wstring ToWideString(std::string narrowString)
	{
	    return std::wstring_convert<std::codecvt_utf8<wchar_t>>().from_bytes(narrowString);
	}


	void CreateMaterial(CwAPI3D::MaterialController* mc) {
		// get the string value of the material
		auto newMaterialNameWS = ToWideString(Value);
		auto newMaterialNameCS = newMaterialNameWS.c_str();
		// check if the material exists
		auto material_id = mc->getMaterialID(newMaterialNameCS);
		
		if (material_id == 0) {
			// if the material does not exist, create it
			material_id = mc->createMaterial(newMaterialNameCS);;
			// set the material group to switchboard materials
			mc->setGroup(material_id, L"Switchboard_Materials");
		}
	}

Giving any free string in setGroup seems to do the trick. I still have an issue with the material name itself, will post a full snippet when solved.

I am trying to create a new material group using the C++ Cadwork API.

Using the UI, I would use the "new material group" button :

Is that function currently available in the API ?

The ICwAPI3DMaterialController allows me to getGroup or setGroup but not createGroup.

Thanks a lot,
Sylvain

Is there a way to change the mouse sensitivity ?
Rotating and panning feels quite sluggish.
Thanks !