From 5b039816c803efb9cdeaaa956bbc7b8eb0764e03 Mon Sep 17 00:00:00 2001
From: gamebabyrocksun <41750362@qq.com>
Date: Thu, 13 Apr 2023 09:40:37 +0800
Subject: [PATCH] =?UTF-8?q?=E7=94=A8=E5=AE=8F=E5=AE=9A=E4=B9=89=E6=9B=BF?=
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---
 .../Shader/0-2 GRS_PBR_Function.hlsli                       | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/27-IBL-With-Material-Texture/Shader/0-2 GRS_PBR_Function.hlsli b/27-IBL-With-Material-Texture/Shader/0-2 GRS_PBR_Function.hlsli
index 6ca6b8b..178256a 100644
--- a/27-IBL-With-Material-Texture/Shader/0-2 GRS_PBR_Function.hlsli	
+++ b/27-IBL-With-Material-Texture/Shader/0-2 GRS_PBR_Function.hlsli	
@@ -43,9 +43,9 @@ float2 SampleSphericalMap(float3 coord)
 	float theta = acos(coord.y);
 	float phi = atan2(coord.x, coord.z);
 	phi += (phi < 0) ? 2 * PI : 0;
-
-	float u = phi * 0.1591f;
-	float v = theta * 0.3183f;
+	// to [0,1]
+	float u = phi	* INV_TWO_PI;
+	float v = theta * INV_PI;
 	return float2(u, v);
 }
 
-- 
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