# How to make curved surface cut in modeling bottle ?

For round bottle:

1. ### Step 1:

Create or open the main body.

2. ### Step 2:

Add a sketch to right or front plane.

3. ### Step 3:

Draw a rectangle. It must be vertical to the axis of rotation.
To produce the same wavy lines on the base body, the rectangle must be constructed according to the equation e=√2 * l, where e is the corner dimension of an imaginary square and our diameter.

Solved to l---> l=d/ √2.
In my case l= 60mm/√2 = 42,43mm

5. ### Step 5:

Now you have to use the "project sketch" method.
Just select the wave-sketch and the face of the rotation

6. ### Step 6:

If u done it right, you have to add a plane on the end/ startpoint of the projected line and the line itself

7. ### Step 7:

Create your cutting-geometrie. remember to plug the geometrie on the projected line and the outer edge.

8. ### Step 8:

Cut the geometrie along the projected line.
At this point it should look like this.

9. ### Step 9:

Since the cut only goes through a quarter of the surface, it must be arranged rotationally.

Done ;)