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I'm trying to make a triangular prism in blender, my first idea was to select the top 4 verticys of a cube and merge them at the center but this made a single point on the top instead of a edge. I have tried a few other methods but couldn't get a perfect even triangular prism. What would be the best way to do this

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3 Answers 3

up vote 2 down vote accepted

Another ways is by adding a cube and then merging the top two edges with SX0 and then remove doubles (WR).

enter image description here enter image description here

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Or select 2 edges in opposite side (in Edge Select mode), then Alt M > Collapse. :) – Leon Cheung Jan 15 '14 at 7:28
The base of this prism would not be equilateral. – Garrett Jan 15 '14 at 8:02
@Garry The OP's original question did not make that a requirement. If you want equilateral, you are best off extruding a 3 vert circle as mentioned below. – gandalf3 Jan 15 '14 at 8:15

If you are talking about a triangular prism, ShiftAto add a Cylinder object, then F6 to set the Vertices number to 3.

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The shape I am trying to create I think is called a triangular prism this could be done by following your first method and extruding the face – Qwertie Jan 15 '14 at 6:40
@qwertie I see, I've updated my answer. If you don't need to have the top/bottom triangles being regular, then gandalf3's answer is nice, as well. – Leon Cheung Jan 15 '14 at 7:10

If you are trying to make an equilateral triangle prism you can first make an equilateral triangle from a square plane. Here's one way to do it: 1. add Mesh->Plane. 2. Subdivide plane twice so it's cut into 16 squares. 3. Select vertices and press F to make new edges (see picture). 4. Extrude the edges into prism and delete the remaining vertices.

enter image description here

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But in this way, two edges have length sqrt(17) and one has sqrt(18). So it's not really equilateral. – Yi Wang Mar 19 at 7:58

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