====== Flip book animation ======


This example is an advanced application of the "Switching signage" example.\\
[[en/vci/sample/onuse/no5]]

It automatically shifts the tiled texture to create a flip-book like animation\\
The UV assigned to the model is a single cell of the 4-by-4 matrix texture.\\
(To set the UV, use 3D modeling software like blender and Maya)

{{vci:sample:material:tutorial_paraanim1.png?400|}}

As shown in the image below, prepare a 4-by-4 texture and use\\
**vci.assets._ALL_SetMaterialTextureOffsetFromIndex** to shift the UV offset.

The same change can be done using **vci.assets._ALL_SetMaterialTextureOffsetFromName** which specifies a Material by its name.\\
The material in the example can be specified by the name "v".

{{vci:sample:material:tutorial_paraanim2.png?400|}}

The number is counted up from left to right and top to bottom


<file lua main.lua>
local assets = vci.assets
local count = 0

local timecount=0

--Synchronization management using a sync variable
if vci.state.Get("COUNT") then
    count = vci.state.Get("COUNT")
end


--The total number of switchable textures... This time its 4x4
local TOTAL = 16
 
-- The number of separation in vertical and horizontal directions: 4 
function SetTextureOffset( count )
    local offset = Vector2.zero
 
    -- y shift
    local Yshift = math.floor(count / 4)
    offset.y = -(1/4) * Yshift
 
    -- x shift
    local Xshift = count % 4
    offset.x = (1/4) * Xshift
 
    assets._ALL_SetMaterialTextureOffsetFromIndex(0, offset)
end

SetTextureOffset(count)

--use the update as the updateAll result in duplicate processing between users
function update()
    timecount=timecount+1
    --Flip the image in how many frames
    if timecount>3 then
        anim()
        timecount=0
    end
end

--Proprietary function
function anim()
    if count >= TOTAL then
        count = 0
    else
        count = count + 1
    end
    vci.state.Set("COUNT", count)
    SetTextureOffset(count)
end
</file>