From 9021bc385008a368b3b4828eb8de0397a5d2274b Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Sat, 27 Mar 2021 18:18:20 +0000
Subject: [PATCH] WebGLRenderer: Reimplemented vertexAlphas program check.

---
 src/renderers/WebGLRenderer.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 4686d9d3de..8444fa67b1 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -1452,6 +1452,7 @@ function WebGLRenderer( parameters ) {
 		materialProperties.instancing = parameters.instancing;
 		materialProperties.numClippingPlanes = parameters.numClippingPlanes;
 		materialProperties.numIntersection = parameters.numClipIntersection;
+		materialProperties.vertexAlphas = parameters.vertexAlphas;
 
 	}
 
@@ -1465,6 +1466,7 @@ function WebGLRenderer( parameters ) {
 		const environment = material.isMeshStandardMaterial ? scene.environment : null;
 		const encoding = ( _currentRenderTarget === null ) ? _this.outputEncoding : _currentRenderTarget.texture.encoding;
 		const envMap = cubemaps.get( material.envMap || environment );
+		const vertexAlphas = material.vertexColors === true && object.geometry.attributes.color && object.geometry.attributes.color.itemSize === 4;
 
 		const materialProperties = properties.get( material );
 		const lights = currentRenderState.state.lights;
@@ -1522,6 +1524,10 @@ function WebGLRenderer( parameters ) {
 
 				needsProgramChange = true;
 
+			} else if ( materialProperties.vertexAlphas !== vertexAlphas ) {
+
+				needsProgramChange = true;
+
 			}
 
 		} else {
-- 
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