1. ## 2:1 Aspect Ratio

I was looking into writing an isometric 2D engine, and noticed a lot of places said to do tiles in 32x15 because of the 2:1 aspect ratio. My question is why is that the standard? Most computer monitors display in 4:3 aspect ratio. I just want some clairfication before working on drawing any of the tiles.

2. screen = 640x480
isometric tiles = 32x15
640/32 = 20
480/16 = 32

It means the ratio of the tiles. As long as the tiles fit the screen width and height you should be ok. I don't know what else to say, I thought it was pretty simple to understand.

3. I understood that it is the ratio of the tiles, my question is why do guides and what not use that as a standard ratio for the tiles?

4. Well you can use whatever ratio you like as long as it fits the screen.

eg.
tiles = 33x11
640/33 = 19.39 *doesn't fit
480/11 = 43.63 *doesn' fit

2:1 or 32x15 or even 32x16 is just easier. unless you want larger tiles you can use 64x30 or 64x32. Whatever you like.

5. Originally Posted by sand_man
Well you can use whatever ratio you like as long as it fits the screen.
Thats not neccesary, really. The tiles can be clipped anywhere they meet screen boundaries; Something you'll have to implement at least by halves anyways, and in full if you desire per-pixel scrolling of the terrain (likely).

Personally i'd use something close to a power of 2 so you don't waste space on your tile textures (if you're using DirectX that is).

6. Oh yeah, I didn't think about scrolling.
Well there you go

7. So far I am using SDL, but hope to move to trying OpenGL and DirectX within the next couple weeks. I want to build my isometric engine in SDL first, so I know the basics as to how it will work. Then I can go back and learn OpenGL or DirectX (need to research more into both to see what I want to go with, would there be any reason to go with one or the other when making a game with a FF Tactics style combat system?) my tiles are 60x29 right now, but could be expanded, I am thinking I will move up to 64x32 since those are powers of 2 and LightAtDawn recommended that.