46 lines
1018 B
C#
46 lines
1018 B
C#
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using System.Collections;
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using System.Collections.Generic;
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using Godot;
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using System;
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namespace Rokojori
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{
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public class OctahedralMapping
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{
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public static Vector3 Hemisphere( Vector2 uv )
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{
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var position = new Vector3 (uv.X - uv.Y, 0, -1.0f + uv.X + uv.Y );
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var absolute = position.Abs();
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position.Y = 1.0f - absolute.X - absolute.Z;
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return position;
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}
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public static Vector3 Sphere( Vector2 uv )
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{
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uv = uv * 2.0f - Vector2.One;
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var position = new Vector3( uv.X, 0, uv.Y );
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var absolute = position.Abs();
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position.Y = 1.0f - absolute.X - absolute.Z;
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if ( position.Y < 0 )
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{
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var sign = position.Sign();
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position.X = sign.X * ( 1.0f - absolute.Z );
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position.Z = sign.Z * ( 1.0f - absolute.X );
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}
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return position;
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}
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public static Vector3 Map( Vector2 uv, bool sphere )
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{
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var position = sphere ? Sphere( uv ) : Hemisphere( uv );
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return position.Normalized();
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}
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}
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}
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