From cd71783f755a3c2f79e496a0a874a0c2cc522d0b Mon Sep 17 00:00:00 2001
From: WestLangley <dat1234@gmail.com>
Date: Sat, 13 May 2017 18:21:56 -0400
Subject: [PATCH] Compute flat normals when detail is zero

---
 src/geometries/PolyhedronGeometry.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/geometries/PolyhedronGeometry.js b/src/geometries/PolyhedronGeometry.js
index 03b6a8b8a0..d294654c08 100644
--- a/src/geometries/PolyhedronGeometry.js
+++ b/src/geometries/PolyhedronGeometry.js
@@ -74,7 +74,16 @@ function PolyhedronBufferGeometry( vertices, indices, radius, detail ) {
 	this.addAttribute( 'position', new Float32BufferAttribute( vertexBuffer, 3 ) );
 	this.addAttribute( 'normal', new Float32BufferAttribute( vertexBuffer.slice(), 3 ) );
 	this.addAttribute( 'uv', new Float32BufferAttribute( uvBuffer, 2 ) );
-	this.normalizeNormals();
+
+	if ( detail === 0 ) {
+
+		BufferGeometry.prototype.computeVertexNormals.call( this ); // flat normals
+
+	} else {
+
+		this.normalizeNormals(); // smooth normals
+
+	}
 
 	// helper functions
 
-- 
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