Creating curve design

Question

Hi, in the image below you can see point "3" is the bottle that I created using blender 2.69. "1" is the side view of the original bottle "2" is the front view of the bottle. Now I want this design of the curve on my blender bottle, but I have no guess how to achieve it. I mean how to create those design on the bottle. The curves on bottle are like small gutter which are towards inside of the bottle.

Answer 1

Some technics to do that (I won't make here the exact same bottle...):

Knife cut

The cut is straight, but the result is parabolic due to the bottle shape.

Knife project

Again a curved shape obtained from a flat curve.

• Create a cutting shape (here a plane)
• Scale/orientate it
• Shift select the bottle and enter edit mode in the bottle (both are selected and that indicates to Blender which shape(s) will cut the bottle)
• Use 'knife project'
• In your situation, make sure that 'cut through' is checked

Beveling

• In edge selection mode
• Select the wanted edge loops
• Use CtrlB
• Choose bevel depth with Numpad + and Numpad -

Once done, give a shape, for instance selecting the two face loops as below and scale them:

Draw it flat and bend the shape

• Use a mirror to make so the future cutting lines will match
• Add a simple deform modifier to bend the shape to 360°
• Make the cuts/bevels as previously
• Apply the modifiers and remove doubles when the shape is as you want
• Add a subsurface modifier
• Scale and merge (or extrude and model) the shape to fit your bottle

Answer 2

Supplementing the options provided by lemon, here is a different approach. Before any other steps, instead of having the vertical edges parallel to the z axis, twist the bottle so that the edges now vertical become helical around the z axis. Adding the groves around the bottle might then be able to be achieved by standard methods of adding geometry.