reworked mesh decimation yes

2026-01-19 09:50:54 +09:00
parent b57d54d69c
commit 54d6a0a1a4
74 changed files with 15788 additions and 8308 deletions
--- a/LightlessSync/ThirdParty/Nanomesh/Base/SymmetricMatrix.cs
+++ b/LightlessSync/ThirdParty/Nanomesh/Base/SymmetricMatrix.cs
@@ -0,0 +1,97 @@
+namespace Nanomesh
+{
+    public readonly struct SymmetricMatrix
+    {
+        public readonly double m0, m1, m2, m3, m4, m5, m6, m7, m8, m9;
+
+        public SymmetricMatrix(in double m0, in double m1, in double m2, in double m3, in double m4, in double m5, in double m6, in double m7, in double m8, in double m9)
+        {
+            this.m0 = m0;
+            this.m1 = m1;
+            this.m2 = m2;
+            this.m3 = m3;
+            this.m4 = m4;
+            this.m5 = m5;
+            this.m6 = m6;
+            this.m7 = m7;
+            this.m8 = m8;
+            this.m9 = m9;
+        }
+
+        public SymmetricMatrix(in double a, in double b, in double c, in double d)
+        {
+            m0 = a * a;
+            m1 = a * b;
+            m2 = a * c;
+            m3 = a * d;
+
+            m4 = b * b;
+            m5 = b * c;
+            m6 = b * d;
+
+            m7 = c * c;
+            m8 = c * d;
+
+            m9 = d * d;
+        }
+
+        public static SymmetricMatrix operator +(in SymmetricMatrix a, in SymmetricMatrix b)
+        {
+            return new SymmetricMatrix(
+                a.m0 + b.m0, a.m1 + b.m1, a.m2 + b.m2, a.m3 + b.m3,
+                a.m4 + b.m4, a.m5 + b.m5, a.m6 + b.m6,
+                a.m7 + b.m7, a.m8 + b.m8,
+                a.m9 + b.m9
+            );
+        }
+
+        public double DeterminantXYZ()
+        {
+            return
+                m0 * m4 * m7 +
+                m2 * m1 * m5 +
+                m1 * m5 * m2 -
+                m2 * m4 * m2 -
+                m0 * m5 * m5 -
+                m1 * m1 * m7;
+        }
+
+        public double DeterminantX()
+        {
+            return
+                m1 * m5 * m8 +
+                m3 * m4 * m7 +
+                m2 * m6 * m5 -
+                m3 * m5 * m5 -
+                m1 * m6 * m7 -
+                m2 * m4 * m8;
+        }
+
+        public double DeterminantY()
+        {
+            return
+                m0 * m5 * m8 +
+                m3 * m1 * m7 +
+                m2 * m6 * m2 -
+                m3 * m5 * m2 -
+                m0 * m6 * m7 -
+                m2 * m1 * m8;
+        }
+
+        public double DeterminantZ()
+        {
+            return
+                m0 * m4 * m8 +
+                m3 * m1 * m5 +
+                m1 * m6 * m2 -
+                m3 * m4 * m2 -
+                m0 * m6 * m5 -
+                m1 * m1 * m8;
+        }
+
+        public override string ToString()
+        {
+            return $"{m0} {m1} {m2} {m3}| {m4} {m5} {m6} | {m7} {m8} | {m9}";
+        }
+    }
+}