The reflections of the book are not correct because the book was rendered directly on the table without having an own geometric model (I'm not an expert in modeling, so the examples are simple). The reflections on the ball also does not seem right, but got the same results with the original version of LuxRender, then there may be something wrong with one method. The idea of these tests is to see the errors, identify the functions and correct them.
thanks for the sincerity!
PS: I posted in the wrong forum, should be work in progress!