I noticed Unity does not have a triangle primitive (Gameobject → 3D object)
I think it should be there, since it is the primitive building block of all 3D geometry.
What do other people think?
How are you going to use that? You can’t build up a mesh from loads of Triangle primitives? If you want to build a mesh in Unity doesn’t Probuilder offer that?
If you need a triangle primitive in Unity then just make one and import it, you can then use it however you want 
I was making a prototype and wanted a cylinder with a triangle on top of it to point in the right direction.
I also noticed Blender and Unreal don’t have triangle primitives. I find it interesting.
And yeah importing one works fine of course
I’d love to have a pyramid primitive too, and a hemisphere… I’d also like to be able to modify the primitives geometry.
Maybe ProBuilder can do that? 
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It’s primitive to create a triangle mesh though. 
It’s just not very useful for creating this as a primitive, except maybe for debugging purposes where you need some kind of arrow.
I’d much rather have pyramid and cone primitives.
See also: Unity Asset Store - The Best Assets for Game Making
Interestingly, there is only an outdated and a demo version that are free.
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I used to be surprised there weren’t more handy primitives built-in, but I think the issue is that their useful window is so tiny and narrow, only at the very beginning of a game’s development and concepting stages.
As soon as you have nailed almost anything down about the game you are making, you immediately want to go to animated or at least correct meaningful shapes.
That said, you can do procgen in Unity all day long, and in fact I have an entire repo of random little procgen stuff, including a triangle, quad, cone, sphere, cylinder, etc. A lot of it builds the mesh from scratch but some of them just use existing primitives to generate compound things that might be useful.
MakeGeo is presently hosted at these locations:
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