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Octagon in top-down perspective?

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JetSetRadioo:
How can I make a octagon in top down perspective? I know with a circle that the height is half of the width, I'm using one third of the width. But an octagon keeps looking off. Any tips?

Ryumaru:
Well, it depends on the exact projection angle you're using for your game. Often this angle changes to suit the asset or fit within tiles anyway, so in pixel art at least, it's not a hard science. the best way I can think of is to take a look at cyangmou's projection tutorial, find out which angle fits your game best, and then just project the octagon onto the surface, scaling it's height as necessary:

JetSetRadioo:
Well I'm not always sure about the viewing angle tbh. I know my angle is the 1/3 circle i talked about that makes sense with the rest of my art. But when talking about rectangular objects, I don't really know. I just draw what makes sense optically? I mean, if you make a house where the front is 60px, u don't have a set formula for how big the roof is gonna be, right? You just make it as long as you think it looks good (and in harmony with the rest). 
Same with the boxes above the crates example, the left one is a box lying down, middle is a cube and the right one is a box standing up. I don't really see how perspective comes into play? I mean if you follow the 1:1 ratio, not all objects will be 1:1. Maybe I'm just not seeing it?  ???

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