Translating alpha map for Self-Illumin shader

Unity Engine
1

I’ve been randomly translating a texture to get some variation without requiring new materials. I apply the translation using the following line:

floormat.mainTextureOffset = new Vector2(tileoffsetx, tileoffsety);

I want to use the Self-Illumin shader, which requires two textures. The code above translates the main texture, but does not translate the alpha map texture. How can I translate both at once?

2

why do you need to? Just drop the alpha map into the slot.