Fix invalid MinMaxAABB error for PolygonSGO.

Assets/Cryville/Crtr/Components/SectionalGameObject.cs

@@ -6,8 +6,8 @@ using UnityEngine;
 
 namespace Cryville.Crtr.Components {
 	public abstract class SectionalGameObject : SkinComponent {
-		protected bool headGenerated;
-		protected Vector3 prevpt;
+		protected Vector3? prevpt;
+		protected Quaternion? prevrot;
 		protected int vertCount = 0;
 		protected MeshWrapper mesh = new MeshWrapper();
 
@@ -24,10 +24,11 @@ namespace Cryville.Crtr.Components {
 		}
 
 		public void AppendPoint(Vector3 p, Quaternion r) {
+			if (prevpt == p && prevrot == r) return;
 			AppendPointInternal(p, r);
 			// if (!headGenerated) Logger.Log("main", 0, "Skin/Polysec", "{0}", r);
-			headGenerated = true;
 			prevpt = p;
+			prevrot = r;
 			vertCount++;
 		}
 
@@ -37,7 +38,8 @@ namespace Cryville.Crtr.Components {
 
 		public virtual void Reset() {
 			vertCount = 0;
-			headGenerated = false;
+			prevpt = null;
+			prevrot = null;
 		}
 	}
 
@@ -142,8 +144,8 @@ namespace Cryville.Crtr.Components {
 				vertices.Add(p + (Vector3)sp);
 			}
 
-			if (headGenerated) {
-				float len = (p - prevpt).magnitude;
+			if (prevpt != null) {
+				float len = (p - prevpt.Value).magnitude;
 				lengths.Add(len);
 				sumLength += len;
 			}