From 7b9a912ff62a95650744f0355ba319789f262285 Mon Sep 17 00:00:00 2001
From: Silc 'Tokage' Renew <tokage.it.lab@gmail.com>
Date: Tue, 1 Mar 2022 19:09:05 +0900
Subject: [PATCH] fix cubic interpolate when looping 3.x

Co-authored-by: robfram <robfram@gmail.com>
---
 scene/resources/animation.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/scene/resources/animation.cpp b/scene/resources/animation.cpp
index fd43b995c22..7674284a543 100644
--- a/scene/resources/animation.cpp
+++ b/scene/resources/animation.cpp
@@ -1718,11 +1718,19 @@ T Animation::_interpolate(const Vector<TKey<T>> &p_keys, float p_time, Interpola
 		case INTERPOLATION_CUBIC: {
 			int pre = idx - 1;
 			if (pre < 0) {
-				pre = 0;
+				if (loop && p_loop_wrap) {
+					pre = len - 1;
+				} else {
+					pre = 0;
+				}
 			}
 			int post = next + 1;
 			if (post >= len) {
-				post = next;
+				if (loop && p_loop_wrap) {
+					post = 0;
+				} else {
+					post = next;
+				}
 			}
 
 			return _cubic_interpolate(p_keys[pre].value, p_keys[idx].value, p_keys[next].value, p_keys[post].value, c);