diff --git a/Assets/Cryville/Crtr/PdtEvaluator.cs b/Assets/Cryville/Crtr/PdtEvaluator.cs
index 68cbf3d..91737ed 100644
--- a/Assets/Cryville/Crtr/PdtEvaluator.cs
+++ b/Assets/Cryville/Crtr/PdtEvaluator.cs
@@ -114,6 +114,7 @@ namespace Cryville.Crtr {
 			_ctxops.Add(IdentifierManager.SharedInstance.Request("clamp"), new func_clamp(() => ContextSelfValue));
 			_ctxops.Add(IdentifierManager.SharedInstance.Request("min"), new func_min(() => ContextSelfValue));
 			_ctxops.Add(IdentifierManager.SharedInstance.Request("max"), new func_max(() => ContextSelfValue));
+			_ctxops.Add(IdentifierManager.SharedInstance.Request("abs"), new func_abs(() => ContextSelfValue));
 		}
 		static PdtEvaluator() {
 			_shortops.Add(new PdtOperatorSignature("@", 2), new op_at_2());
@@ -237,12 +238,12 @@ namespace Cryville.Crtr {
 		class op_at_2 : PdtOperator {
 			public op_at_2() : base(2) { }
 			protected override void Execute() {
-				int _, pc;
+				int _;
 				var op0 = GetOperand(0);
 				var op1 = (int)Math.Round(GetOperand(1).AsNumber());
 				if (op0.Type != PdtInternalType.Vector) throw new InvalidOperationException("Not a vector");
-				op0.GetArraySuffix(out _, out pc);
-				if (op1 >= pc) throw new IndexOutOfRangeException();
+				op0.GetArraySuffix(out _, out _);
+				if (op1 >= (op0.Length - sizeof(int)) / sizeof(float)) throw new IndexOutOfRangeException();
 				float result = GetOperand(0).AsNumber(op1 * sizeof(float));
 				GetReturnFrame(PdtInternalType.Number, sizeof(float)).SetNumber(result);
 			}
@@ -366,6 +367,22 @@ namespace Cryville.Crtr {
 				ret.SetNumber(Mathf.Max(a, b));
 			}
 		}
+		class func_abs : PdtOperator {
+			readonly Func<PropSrc> _ctxcb;
+			public func_abs(Func<PropSrc> ctxcb) : base(1) {
+				_ctxcb = ctxcb;
+			}
+			protected override unsafe void Execute() {
+				var ret = GetReturnFrame(PdtInternalType.Number, sizeof(float));
+				float arg;
+				switch (LoadedOperandCount) {
+					case 0: arg = oputil.AsNumber(_ctxcb()); break;
+					case 1: arg = GetOperand(0).AsNumber(); break;
+					default: throw new ArgumentException("Argument count not 0 or 1");
+				}
+				ret.SetNumber(Mathf.Abs(arg));
+			}
+		}
 		unsafe static class oputil {
 			public static float AsNumber(PropSrc src) {
 				if (src == null)