You might have some object like tables, walls or chairs which you do not want to include in your capture. No problem, turn on Enable the bounding box function and use the sliders to minimize the area of capture.
Tip: this function also helps with calibration while you if you have an object inside the capture area.
If you wish to remove the floor just turn the function on. The area of the floor that will be removed will turn red, showing exactly what part of the floor will be gone.
To get the best results in removing the whole floor it’s important that the lighting in the room would be even from all of the sides.
Try "photogammery", "diorama", or "dinosaur", for some cool results.