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Question by noanoa · May 21, 2014 at 10:56 PM · shadermeshlightingmaterial

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

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.

alt text

culloff.jpg (62.1 kB)
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avatar image Clet_ · May 22, 2014 at 12:20 AM 0
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Do you really need light? If not, you can go with an unlit shader that is built-in in Unity. If you do, then yes, shading is the way to go.

If you're new to shder code. I'd suggest taking a look into this tutorial

avatar image Kiwasi · May 22, 2014 at 12:21 AM 0
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To make everything light up evenly you can use to directional lights in opposition to each other

avatar image noanoa · May 22, 2014 at 02:57 AM 0
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Yes, light has a big role in my game. I can't use ambient color or directional lights because the scene takes place in night and it should be complete dark where lights are not lit.

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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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avatar image Clet_ · May 22, 2014 at 01:18 AM 0
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Didn't know that. Very useful tip

avatar image 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

avatar image 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

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