26 lines
739 B
Text
26 lines
739 B
Text
/*
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contributors: Patricio Gonzalez Vivo
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description: Returns a hexagon-shaped SDF
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use: hexSDF(<float2> st)
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options:
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- CENTER_2D: float2, defaults to float2(.5)
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examples:
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- https://raw.githubusercontent.com/patriciogonzalezvivo/lygia_examples/main/draw_shapes.frag
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef FNC_HEXSDF
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#define FNC_HEXSDF
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float hexSDF(float2 st) {
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#ifdef CENTER_2D
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st -= CENTER_2D;
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st *= 2.0;
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#else
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st = st * 2.0 - 1.0;
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#endif
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st = abs(st);
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return max(abs(st.y), st.x * .866025 + st.y * .5);
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}
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#endif
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