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I'm sort of new to blender. I'm having problems with overlapping meshes. when I render, the strange blackish effect is observed. Specifically, I'm trying to model a 6-point star ("star of david"). e.g., see: https://en.wikipedia.org/wiki/File:Star_of_David.svg

I start with a non filled triangle, duplicate it and scaling it down in edit-mode, and then creating 3 quad faces. I duplicate in object mode, rotate 180deg around the z axis, and do a bool union. However, in the resulting object, the vertices don't land on the intersection of the triangle edges, so I can't delete the overlapping regions.

How can this be done? Thanks.

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Hi JohnDope so it takes some time for me to answer so follow these steps and images...

  1. Make a circle with 3 points (NO FILL) and then extrude it in edit mode using "E" and "S" to the desired width like here...

enter image description here

  1. Make a copy of this triangle in object mode using "SHIFT + D" and rotate it 180degrees using "R" like here...

enter image description here

...in fact now You have two options. You can slightly move the 2nd object up or down so there will be no overlap and then select both triangles and join them using "CTRL + J" and You will be good beause of using a really slight move (0.01mm for example - the object will look good enough).

Second option is to edit it properly and thats the one we do now ;).

  1. Go to the object mode, select 2nd triangle and move it up. Then select 1st triangle with the 2nd still selected so use "SHIFT" when clicking. Then go to edit mode so the scene will look like this...

enter image description here

  1. Now use the Knife Project as "rectangled" on the image below. The 1st triangle will get a new topology because of that knife-cut (circled green) on all places needed. Its importand to look from top when cutting because this function is VIEW-DEPENDENT!

enter image description here

  1. In object mode select both objects and join them together using "CTRL + J" and enter edit mode. We have to move all the point into the same height and to do this we simply make the height ZERO. Select all points and hit "S" then "Z" and then "0" (ZERO on the numpad) and "ENTER". The scene should look like here...

enter image description here

  1. Now You select only the vertices of the 2nd triangle in edit mode. Hit "X" and select Only Edges & Faces option so the points will stay in place like here...

enter image description here

  1. You have to face-up the whole thing now so select 4 vertices at a time and make faces using "F" key like on the image below...

enter image description here

  1. Simply make all the necessary faces and YOU ARE DONE MATE - CONGRATS!!! Final object should look like this...

enter image description here

Thats all - hope it helps Buddy.

(Please dont forget to ACCEPT ANSWER using checkmark if it suits You)

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My way of doing this:

  1. Create a triangle as shown above

  2. Set Origin to the center of mass

  3. Duplicate the triangle

  4. Rotate the duplicate 180 deg around Y axis if your view is Front

  5. Align the triangles

  6. Use Knife Project and remove highlighted faces

  7. Ctrl+J

Done

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