Freestyle : problem with visibility

Question

I'm trying to use freestyle, to draw a cylinder that goes though a circle:

I'd like to add lines around the green part above like this:

I tried several freestyle parameters, including QI Range, Visible, Hidden, material boundaries, but I can't manage to do that...

Any idea?

Thank you!

Answer 1

Your issue comes from your object design : the cylinder and the circle should be in a single object + the circle should have a thickness + The circle should be an extrusion of a ring of the cylinder.

The idea is to create the cylinder, to add a loop on this cylinder and to extrude this loop to create the cicle.

Here is a full how to :

• Create a new project
• Delete the cube
• Add a cylinder : press Shift + A then select Mesh and Cylinder
• Enter in edit mode (TAB)
• Press S then Z to enable Z scrolling
• Move the mouse to increase the hight of the cylinder.

• Press ENTER to validate.

• Move the mouse cursor in the center of the cylinder

• Press CTRL + R to add a loop cut : a pink horizontal circle should appear at the middle of the cylinder like this :

• Scroll up the middle mouse button to have 2 pink circles like this :

• Press the left mouse button
• Move the mouse up to place the new ring

• Press the left mouse button to validate

• Enable the Face select mode (CTRL + TAB and select Faces)

• move the mouse cursor on a vertical edge of the middle ring you have just created
• Press ALT + RMB : this ring should be selected (in orange) like this :

• Press E to extrude this ring and press LMB to validate immediatly (without moving the mouse)
• Press S to scall the ring and Shift + Z to lock Z scalling
• Move your mouse to increase the diameter of the ring like this :

• Press LMB to validate

To enable Freestyle :

• exit Edit Mode (TAB)
• in the Render panel, enable the Freestyle option
• launch render (F12)

Here is the result (after adding materials and reducing the circle thickness :