Convert Roughness as Metallic map alpha channel

Scripts & Extensions
1

This script is for combine a Roughness texture and a Metallic map texture together, Since I can’t do it on blender(I hate shadergraph for some reason).
You need to keep Roughness texture(Black&White) in your clipboard while having Metallic map(Also Black&White)’s cel active on aseprite when using this script. Result will be create as new layer name “Metallic_map”.

*edit I use color from Roughness instead of metallic.(fixed)

I not sure if alpha channel need to be invert for unity’s metallic alpha setting.

app.transaction(function()

local Metallic = app.image
local Roughness = app.clipboard.image
if not Roughness then return app.alert ("Something wrong with Metallic layer") end
if not Roughness then return app.alert ("Need to copy Roughness") end

if not Metallic.cel then return app.alert ("Something wrong with cel") end

local ln = app.sprite:newLayer()
if not ln then return app.alert ("Something wrong with new layer") end

if not Metallic.cel.frame then return app.alert ("Can't get target frame") end


for cx = 0 , Metallic.width, 1 do
	for cy = 0 , Metallic.height, 1 do

		local rc = Roughness:getPixel(cx,cy)
		if not rc then return app.alert ("Can't get Roughness pixel") end

		local mc = Metallic:getPixel(cx,cy)
		if not mc then return app.alert ("Can't get Metallic pixel") end

		local NR = app.pixelColor.rgbaR(mc)
		if not NR then return app.alert ("Can't get Metallic color(r)") end

		local NG = app.pixelColor.rgbaG(mc)
		if not NG then return app.alert ("Can't get Metallic color(g)") end

		local NB = app.pixelColor.rgbaB(mc)
		if not NB then return app.alert ("Can't get Metallic color(b)") end

		local NA = app.pixelColor.rgbaR(rc)
		if not NA then return app.alert ("Can't get Roughness color(r)") end

		app.useTool{
			tool="pencil",
			color=Color{ r=NR, g=NG, b=NB, a=NA },
		    brush=Brush(1),
			points={Point{x=cx, y=cy}},
			layer=ln,
			ink=0
		}
	end
end

ln.name = "Metallic_map"

end)

This is my first lua script ever made, It took me 4 hour. And I don’t know why I decide to do it this way.