RE: Adding a solid to an ElementDescriptor

[quote user="Jorgen Brix"]Tool_elementCreateTorus( &torus, 0.045, 0.010, 180 );[/quote]

MDL usually uses UORs, not master units, to specify dimensions.  You're creating a very small torus.  Try this...

const double UORs = mdlModelRef_getUorPerMaster (ACTIVE_MODEL);
const double radius1 = .045 * UORs;
const double radius2 = .010 * UORs;
Tool_elementCreateTorus( &torus, radius1, radius2, 180 );