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I have created a simple grass scene with materials created in cycles.

enter image description here

I would like to render this image with an alpha mask and without any lighting. How would I do it?

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up vote 5 down vote accepted

Set the camera to Orthographic view.

cmaera settings

Then render it as a PNG with RGBA.
Under the Film tab check the check mark for transparent.

enter image description here

Now if you need separate black and white image for the alpha mask.
Go to the compositer. Plug the Alpha from the render layer in to the Image socket of the Composite node. enter image description here

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