Much better system in the IPolygon interface now.

Changelog.md

@@ -10,38 +10,46 @@ Here's the full changelog:
         * UnsafeHelper
             + Q_rsqrt
     * Mathematics
+        * Abstract
+            + IPolygon<T>h
+            * ITriangulate
+                - TriangulateAll(ITriangulate[])
+                = Marked the method `TriangulateAll<T>(T[])` as virtual
         * Geometry
-                * Line
+            - Box2d (REMEMBER: name change)
-                    = Replaced all references to `Vert` with references to `Float3`
+            - Box3d (REMEMBER: name change)
-                * Polygon
+            - Line
-                    = Replaced all references to `Vert` with references to `Float3`
+            - Polygon
-                * Quadrilateral
+            - Quadrilateral
-                    = Replaced all references to `Vert` with references to `Float3`
+            - Sphere
-                * Sphere
+            - Triangle
-                    = Replaced all references to `Vert` with references to `Float3`
-                * Triangle
-                    = Replaced all references to `Vert` with references to `Float3`
-                = Renamed `Box2D` to `Box2d`
-                    = Replaced all references to `Vert` with references to `Float3`
-                = Renamed `Box3D` to `Box3d`
-                    = Replaced all references to `Vert` with references to `Float3`
             - Vert
         * NumberSystems
             * Complex
                 = Replaced all references to `Vert` with references to `Float3`
             * Quaternion
                 = Replaced all references to `Vert` with references to `Float3`
+        * Angle
+            + FromVerts(Float3, Float3, Float3)
+            + GetCoterminalAngles()
+            + GetCoterminalAngles(Angle, Angle)
         * Float2
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Float3
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Float4
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Int2
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Int3
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Int4
+            + InverseMagnitude
             = Replaced all references to `Vert` with references to `Float3`
         * Vector2d
             = Replaced all references to `Vert` with references to `Float3`

Nerd_STF/Mathematics/Abstract/IFloatArray.cs

@@ -0,0 +1,8 @@
+namespace Nerd_STF.Mathematics.Abstract;
+
+public interface IFloatArray<T> where T : IFloatArray<T>
+{
+    public static abstract float[] ToFloatArrayAll(params T[] vals);
+
+    public float[] ToFloatArray();
+}

Nerd_STF/Mathematics/Abstract/IPolygon.cs

@@ -1,7 +1,27 @@
 namespace Nerd_STF.Mathematics.Abstract;
 
-public interface IPolygon : ITriangulate
+public interface IPolygon<T> : IAverage<T>, IEquatable<T>,
+    IFloatArray<T>, IGroup<Float3>, IIndexAll<Float3>, IIndexRangeAll<Float3>,
+    ILerp<T, float>, IMedian<T>, ISplittable<T, (float[] Xs, float[] Ys, float[] Zs)>,
+    ITriangulate
+    where T : IPolygon<T>
 {
+    public float Area { get; }
+    public Float3 Midpoint { get; }
+    public float Perimeter { get; }
+
     public Float3[] GetAllVerts();
-    public float[] ToFloatArray();
+    
+    public static abstract T operator +(T poly, Float3 offset);
+    public static abstract T operator -(T poly, Float3 offset);
+    public static abstract T operator *(T poly, float scale);
+    public static abstract T operator *(T poly, Float3 scale3);
+    public static abstract T operator /(T poly, float scale);
+    public static abstract T operator /(T poly, Float3 scale3);
+
+    public static abstract implicit operator T(Fill<Float3> fill);
+    public static abstract implicit operator T(Fill<Int3> fill);
+    public static abstract implicit operator T(Fill<Line> fill);
+    public static abstract implicit operator T(Fill<float> fill);
+    public static abstract implicit operator T(Fill<int> fill);
 }

Nerd_STF/Mathematics/Abstract/ITriangulate.cs

@@ -2,12 +2,6 @@
 
 public interface ITriangulate
 {
-    public static virtual Triangle[] TriangulateAll(params ITriangulate[] triangulatables)
-    {
-        List<Triangle> res = new();
-        foreach (ITriangulate triangulatable in triangulatables) res.AddRange(triangulatable.Triangulate());
-        return res.ToArray();
-    }
     public static virtual Triangle[] TriangulateAll<T>(params T[] triangulatables) where T : ITriangulate
     {
         List<Triangle> res = new();

Nerd_STF/Nerd_STF.csproj

@@ -66,4 +66,8 @@ Anyway, that's everything in this update. Again, pretty small, but meaningful no
     </None>
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Mathematics\Geometry\" />
+  </ItemGroup>
+
 </Project>