b-badass

Thanks Dan C, anon2, and Lagarto. Yes, I'm using Mac App Store ver. 1.8.3 and now 1.8.4, full retail version . Not sure about the Metal Hardware Accelerator vs OpenGL discrepancy but clearly anon2 has shown that this is the issue. In the meantime, thanks again Lagarto, for the Triangular custom First and Second Axis angle workaround. Running OSX Catalina 10.15.6.

Thanks, anon2 and Legato. I'm sure that's it; I'm actually on AD 1.8.3. But... After updating to AD 1.8.4 (via the Apple App Store), I still have the same problem: Grid type > Horizontal triangular gives me horizontal rhombuses. Which make me think there is a setting somewhere that I have set differently than the two of you, anon2 and Lagarto. Could that be the case? Or could it be that the Apple App Store version of AD is persnickety different than the Affinity website version?

Thanks, GarryP. I was going to address your question but then Lagarto nailed it exactly. THANK YOU, Legarto! That's precisely what we are trying to accomplish. I would suggest this is what should be delivered automatically when one selects Grid type > Horizontal triangular. (Maybe there could also be a Horizontal rhombus setting as well, to accomplish what the Horizontal triangular setting is currently delivering.) Anyway, thanks again, Legarto!

I would like to establish a grid of equilateral triangles with a horizontal base line. When I select View > Grids and Axis Manager... (which resolves to Grids and Snapping Axis) > Grid Type > Triangular, I get the grid I want only rotated by 90º from what I want. When I instead select Grid Type > Horizontal Triangular, I get a horizontal grid of rhombuses (equilateral parallelograms) not equilateral triangles. This would be fine if I could add the missing third axis but I have not been able to discover how to accomplish this. I believe this represents a bug in the Horizontal Triangular function. A perhaps related issue is that when I tick the checkbox for "Show axis editing handles" I am unable to adjust the angle of the axes when I hold down the ⌘ key (as documentation instructs that I should be able to), the result is only to change the grid size, just as if I were not holding down the ⌘ key.