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Help with rendering to a texture

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I am trying to make a quad to represent the positions of the enemy and the player in the game(like a radar).

I just want to represent the positions as simple dots(point lists) with different colors on a quad. I don't need a world matrix since i am specifying the coordinates straight in the local space. the positions are not changing with the view so i guess i wont need a view matrix too, but what should i specify for the projection matrix??? should i specify the aspect ratio as the resolutions of the texture itself(256/256)?? what should i put for the vertical field of view???

I tried to render it with a projection matrix of aspect ratio of 256/256 and a field of view angle of Pi/4 but it didn't work(nothing showed up).

Any suggestions???

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