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Question by Bluestrike · Jul 04, 2011 at 01:07 PM · shader

Offset texture alpha channel

I would like to scroll the alpha channel for a texture that is using the transparent/diffuse shader. but I have no idea how to tell SetTextureOffset to acces the aplha channel.

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Answer by Waz · Jul 04, 2011 at 01:09 PM

The alpha channel is not separate from the rest of the texture. Do you mean an alpha cutoff (for that, use Transparent Cutout).

If you need to scroll the alpha, you will need to make a new shader. Probably easiest to put the alpha on a whole new image since you'll need two texture samplers anyway.

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avatar image Bluestrike · Jul 04, 2011 at 02:44 PM 0
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Ah doh, In the source engine you could make the alpha channel scroll seperate from the image so I was hoping Unity could do that too. I want to make some holografic/shield effect and the texture its alpha channel would be somewhat cloud ish so the transparancy changes as it scrolls along.

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