Flipbook Node

Description

Creates a flipbook, or texture sheet animation, of the UVs supplied to input UV. The amount of tiles on the sheet are defined by the values of the inputs Width and Height. The index of the current tile is defined by the value of the input Tile.

This node can be used to create a texture animation functionality, commonly used for particle effects and sprites, by supplying Time to the input Tile and outputting to the UV input slot of a Texture Sampler.

UV data is typically in the range of 0 to 1 starting from the bottom left of UV space. This can be seen by the black value at the bottom left corner of a UV preview. As flipbooks typically start from top left the parameter Invert Y is enabled by default, however you can change the direction of the Flipbook by switching the Invert X and Invert Y parameters.

Ports

Name	Direction	Type	Binding	Description
UV	Input	Vector 2	UV	Input UV value
Width	Input	Float	None	Amount of horizontal tiles
Height	Input	Float	None	Amount of vertical tiles
Tile	Input	Float	None	Current tile index
Out	Output	Vector 2	None	Output UV value

Controls

Name	Type	Options	Description
Invert X	Toggle	True, False	If enabled tiles are iterated from right to left
Invert Y	Toggle	True, False	If enabled tiles are iterated from top to bottom

Generated Code Example

The following example code represents one possible outcome of this node.

float2 _Flipbook_Invert = float2(FlipX, FlipY);

void Unity_Flipbook_float(float2 UV, float Width, float Height, float Tile, float2 Invert, out float2 Out)
{
    Tile = floor(fmod(Tile + float(0.00001), Width*Height));
    float2 tileCount = float2(1.0, 1.0) / float2(Width, Height);
    float base = floor((Tile + float(0.5)) * tileCount.x);
    float tileX = (Tile - Width * base);
    float tileY = (Invert.y * Height - (base + Invert.y * 1));
    Out = (UV + float2(tileX, tileY)) * tileCount;
}