is there a diference between deleting objects by backspace or delete button? No. i have modeled a cube with a y-dimensional of 100 units. the top view doesn´t show the top of the model. also other objects get invisible. i know that objects, which are placed in a far distance disappear in the viwport view until you raise up the far clip plane value of the camera. but what do in my case? I don't understand the question.