45 lines
2.2 KiB
Markdown
45 lines
2.2 KiB
Markdown
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# Flipbook Node
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## Description
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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**.
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This node can be used to create a texture animation functionality, commonly used for particle effects and sprites, by supplying [Time](Time-Node.md) to the input **Tile** and outputting to the UV input slot of a [Texture Sampler](Sample-Texture-2D-Node.md).
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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.
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## Ports
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| Name | Direction | Type | Binding | Description |
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|:-------|:----------|:---------|:--------|:------------|
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| UV | Input | Vector 2 | UV | Input UV value |
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| Width | Input | Float | None | Amount of horizontal tiles |
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| Height | Input | Float | None | Amount of vertical tiles |
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| Tile | Input | Float | None | Current tile index |
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| Out | Output | Vector 2 | None | Output UV value |
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## Controls
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| Name | Type | Options | Description |
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|:---------|:-------|:------------|:------------|
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| Invert X | Toggle | True, False | If enabled tiles are iterated from right to left |
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| Invert Y | Toggle | True, False | If enabled tiles are iterated from top to bottom |
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## Generated Code Example
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The following example code represents one possible outcome of this node.
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```
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float2 _Flipbook_Invert = float2(FlipX, FlipY);
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void Unity_Flipbook_float(float2 UV, float Width, float Height, float Tile, float2 Invert, out float2 Out)
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{
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Tile = floor(fmod(Tile + float(0.00001), Width*Height));
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float2 tileCount = float2(1.0, 1.0) / float2(Width, Height);
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float base = floor((Tile + float(0.5)) * tileCount.x);
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float tileX = (Tile - Width * base);
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float tileY = (Invert.y * Height - (base + Invert.y * 1));
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Out = (UV + float2(tileX, tileY)) * tileCount;
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}
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```
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