One area where one point perspective can be quite useful is for sketching room layouts
Although it is possible to sketch products in one point perspective, the perspective is too aggressive on the eye making products look bigger than they actually are.
STEP 1 Draw the vanishing point in the center of the horizon line and label it.
STEP 2 Now draw a square or rectangle and label it "front face". Draw it in one of the lower corners so you have plenty of room to add more forms. You can continue to relate the drawing to the physical box model as you work.
STEP 3 Now connect three corners of your rectangle or square to the vanishing point. These are orthogonals. Draw lightly so you can erase!
STEP 4 Draw a horizontal line to end your form.
STEP 5 Draw a vertical line down from the horizontal line to complete the side.
STEP 6 Erase the remaining orthogonals.
All perspective drawings start with the basic geometric shapes.