37 lines
1.6 KiB
Markdown
37 lines
1.6 KiB
Markdown
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# Polygon Node
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## Description
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Generates a regular polygon shape based on input **UV** at the size specified by inputs **Width** and **Height**. The polygon's amount of sides is determined by input **Sides**. The generated shape can be offset or tiled by connecting a [Tiling And Offset Node](Tiling-And-Offset-Node.md). Note that in order to preserve the ability to offset the shape within the UV space the shape will not automatically repeat if tiled. To achieve a repeating polygon effect first connect your input through a [Fraction Node](Fraction-Node.md).
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NOTE: This [Node](Node.md) can only be used in the **Fragment** shader stage.
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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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| Sides | Input | Float | None | Amount of sides |
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| Width | Input | Float | None | Polygon width |
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| Height | Input | Float | None | Polygon height |
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| Out | Output | Float | None | Output value |
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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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void Unity_Polygon_float(float2 UV, float Sides, float Width, float Height, out float Out)
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{
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float pi = 3.14159265359;
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float aWidth = Width * cos(pi / Sides);
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float aHeight = Height * cos(pi / Sides);
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float2 uv = (UV * 2 - 1) / float2(aWidth, aHeight);
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uv.y *= -1;
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float pCoord = atan2(uv.x, uv.y);
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float r = 2 * pi / Sides;
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float distance = cos(floor(0.5 + pCoord / r) * r - pCoord) * length(uv);
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Out = saturate((1 - distance) / fwidth(distance));
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}
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```
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