From 58bd51ef3668a2c225dc168d3be4f9f1564ece69 Mon Sep 17 00:00:00 2001
From: Takahiro <hogehoge@gachapin.jp>
Date: Thu, 30 May 2019 17:53:43 +0900
Subject: [PATCH] Update skeleton only once in a frame

---
 src/objects/Skeleton.js        | 2 ++
 src/renderers/WebGLRenderer.js | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/objects/Skeleton.js b/src/objects/Skeleton.js
index 8764e93cec..539c75bb20 100644
--- a/src/objects/Skeleton.js
+++ b/src/objects/Skeleton.js
@@ -16,6 +16,8 @@ function Skeleton( bones, boneInverses ) {
 	this.bones = bones.slice( 0 );
 	this.boneMatrices = new Float32Array( this.bones.length * 16 );
 
+	this.version = - 1;
+
 	// use the supplied bone inverses or calculate the inverses
 
 	if ( boneInverses === undefined ) {
diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index bd6b0f83b4..da016412bb 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1306,7 +1306,14 @@ function WebGLRenderer( parameters ) {
 
 				if ( object.isSkinnedMesh ) {
 
-					object.skeleton.update();
+					// update skeleton only once in a frame
+
+					if ( object.skeleton.version !== info.render.frame ) {
+
+						object.skeleton.update();
+						object.skeleton.version = info.render.frame;
+
+					}
 
 				}
 
-- 
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