nextSunTexture.lua

local nextSunTexture = function()
    local textures = {
        '${DATA}/mas/br_photo_bas05_trans_20G_offset.png',
        '${DATA}/mas/br_photo_bas05_trans_100G_offset.png',
        '${DATA}/mas/br_photo_bas05_trans_1000G_offset.png'
    }
    local currentTex = openspace.getPropertyValue('Scene.Sun.renderable.ColorTexture')
    local newIndex = 1

    for i, tex in ipairs(textures) do
        if (currentTex == tex) then
            newIndex = 3
        end
    end

    -- if (newIndex > #textures) then
    --     newIndex = 1
    -- end

    local texToSet = "\'" .. textures[newIndex] .. "\'"
    return "openspace.setPropertyValueSingle('Scene.Sun.renderable.ColorTexture', " .. texToSet .. ");"
end