Sometimes it can be, that an undesirable geometry should be invisible within the scene.
This could be done through the material editor. An invisible material.
Sorry for my stupid question, but if the object is undesirable, why put it into the scene
Or maybe you could use the Transparent material template?
With transperancy it does not work. Check it out.
Of course I can go to my model, change it an reload, but it can be that I am not the producer of the model.