Add area judge functions.

Assets/Cryville/Crtr/PropSrc.cs

@@ -1,6 +1,7 @@
 using Cryville.Common.Pdt;
 using System;
 using RBeatTime = Cryville.Crtr.BeatTime;
+using RVector4 = UnityEngine.Vector4;
 
 namespace Cryville.Crtr {
 	public abstract class PropSrc {
@@ -95,5 +96,21 @@ namespace Cryville.Crtr {
 				}
 			}
 		}
+		public class Vector4 : FixedBuffer {
+			readonly Func<RVector4> _cb;
+			public Vector4(Func<RVector4> cb) : base(PdtInternalType.Vector, 4 * sizeof(float) + sizeof(int)) { _cb = cb; }
+			protected unsafe override void InternalGet() {
+				base.InternalGet();
+				var vec = _cb();
+				fixed (byte* _ptr = buf) {
+					float* ptr = (float*)_ptr;
+					*ptr++ = vec.x;
+					*ptr++ = vec.y;
+					*ptr++ = vec.z;
+					*ptr++ = vec.w;
+					*(int*)ptr = PdtInternalType.Number;
+				}
+			}
+		}
 	}
 }