How to light back side of quad mesh same way as front side?

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Normally, when lighting effect applied to quad/plane(or any paper) mesh, one side is bright and the other side becomes darker. But I want both sides of the mesh to be lit as if both sides are facing light source to make them brighter for some game scene.

I assume this is shader's work but I've never written one so have no idea where to start. Could anyone give me some hint? Thanks.

[Edit] When I tried Cull Off shader with quad/plane mesh, it did give both sides of the mesh same lighting but when the front-side is not lit, neither does the back-side.

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Answer by Eric5h5 · May 22, 2014 at 12:38 AM

Just use a single-sided quad and put "cull off" in the shader. Then both sides will be rendered with the same lighting.

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Clet_ · May 22, 2014 at 01:18 AM 0

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Didn't know that. Very useful tip

noanoa · May 22, 2014 at 03:04 AM 0

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It partially worked but when the active side doesn't receive light, same goes to the other side -.- I have uploaded a picture

noanoa · May 22, 2014 at 03:31 AM 0

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It seems setting dummy blank normal map with "cull off" fixed this problem. I have no idea why... I will accept and close the question after testing a little more

How to light back side of quad mesh same way as front side?

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