double-sided plane with texture?

Question

how do i create a double-sided plane with a transparent texture on one side, that is visible from the backside as well (mirror-inverted)?

Answer 1

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Answer by duck · Dec 03, 2009 at 10:11 PM

There are many ways to do this:

Create a two sided plane mesh in your 3D editor of choice.
Use a two-sided shader.
Use two back-to-back plane primitiveas, parented to a single empty game object, and work with the parent gameobject instead.

Some of the particle shaders are two-sided, such as "Particles/Alpha Blended". This shader will use the alpha channel of the texture you provide for transparency, but you can also fade the shader in and out as a whole by adjusting the alpha value of the Tint Color. You can set the Tint Color in your scripts by using Material.SetColor.

If you want a two-sided version of one of the other built-in shaders which isn't currently two-sided, you'll need to:

download the Built-In Shader Source files
duplicate the required shader into your assets
set (or change) the culling value to "Off"

Then use your new custom shader in your material.

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duck ♦♦ · Dec 03, 2009 at 10:23 PM 0

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actually I don't think the back to back thing wouldn't quite fit your 'mirror inverted' requirement.

flexrails · Dec 04, 2009 at 12:17 AM 0

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duck, thanks! how do i create a two-sided shader? how do i change transparency of the texture material at runtime? thanks, flexrails

duck ♦♦ · Dec 04, 2009 at 09:53 AM 0

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I've updated the answer to include the answers to these questions.

Wolfram · Aug 03, 2010 at 12:00 PM 0

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the back-to-back method with mirroring works, if you use a separate material with textureScale=(-1,1) and textureOffset=(1,0).

Gillissie · Apr 18, 2011 at 12:35 AM 1

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Duck, how exactly do you set (or change) the culling value to "Off"? I don't see the word "cull" in the shader source (for AlphaTest-Diffuse).

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Answer 2

Answer by golgauth 1 · May 08, 2011 at 11:17 PM

Yep, I agree with CULL Off method, but you must avoid Parallax built-in shaders if you don't want to get strange behaviour on the backside. Classical bumpmapping works good ;-)

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Answer 3

Answer by username_unity_of_my · Oct 18, 2015 at 01:37 PM

You can use this package on asset store if you like.
http://u3d.as/content/mario-lelas/double-sided-standard-mobile-legacy-shaders
It maybe fit your description. Use standard double sided shader and rendering mode: transparent. It draws double sided meshes with accurate lighting in single draw call and pass.

Video:
https://youtu.be/z-u3CEfgYhY

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double-sided plane with texture?

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