i want to create a 2d game with 3d view .. i have a 3d model tank and i want to take different pictures from different angles
but i don't know my camera must set up in perspective or isometric .
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It depends on if your game will be perspective, isometric, or just use sprites of 3d models on a 2d plane...
If your making sprite sheets of 3d models I would recommend using something like http://www.thegamecreators.com/?m=view_product&id=2302 or https://www.garagegames.com/products/spriteworks so you can save yourself a ton of camera work and if you don't like the angle you can re-position easily and re-shoot the sheet/shot.