*

Assets/DoubleMath.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[Serializable]
+public  struct Double3 {
+    public double X;
+    public double Y;
+    public double Z;
+
+    public static Double3 operator *(Double3 v, double r) {
+        return new Double3 { X = v.X * r, Y = v.Y * r, Z = v.Z * r };
+    }
+
+    public Vector3 ToVector3() {
+        return new Vector3((float)X, (float)Y, (float)Z);
+    }
+
+    public double Length() {
+        return Math.Sqrt(X * X + Y * Y + Z * Z);
+    }
+    public void Normalize() {
+        var len = Length();
+        X /= len;
+        Y /= len;
+        Z /= len;
+    }
+}
+
+[Serializable]
+public struct SphericalDir {
+    public double Theta;
+    public double Phi;
+
+    public Double3 ToCartesian() {
+        return new Double3 { X = Math.Sin(Theta) * Math.Cos(Phi), Y = Math.Sin(Theta) * Math.Sin(Phi), Z = Math.Cos(Theta) };
+    }
+}
+
+[Serializable]
+public struct SphericalCoord {
+    public double R;
+    public SphericalDir Dir;
+
+    public Double3 ToCartesian() {
+        return Dir.ToCartesian() * R;
+    }
+}
+