From a5fc4c98abf4723ffe095adca692ef21deaab255 Mon Sep 17 00:00:00 2001
From: hhhhkrx <zengyan0605@163.com>
Date: Mon, 10 Feb 2025 16:01:45 +0800
Subject: [PATCH] fix: refractionTransmitted need linear space

---
 packages/shader-shaderlab/src/shaders/shadingPBR/BTDF.glsl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/shader-shaderlab/src/shaders/shadingPBR/BTDF.glsl b/packages/shader-shaderlab/src/shaders/shadingPBR/BTDF.glsl
index 0a6ae4919d..76a80ee168 100644
--- a/packages/shader-shaderlab/src/shaders/shadingPBR/BTDF.glsl
+++ b/packages/shader-shaderlab/src/shaders/shadingPBR/BTDF.glsl
@@ -23,6 +23,9 @@
 
         // Sample the opaque texture to get the transmitted light
         vec3 refractionTransmitted = texture2D(camera_OpaqueTexture, refractionCoords).rgb;
+        #ifndef ENGINE_IS_COLORSPACE_GAMMA
+            refractionTransmitted = gammaToLinear(vec4(refractionTransmitted, 1.0)).rgb;
+        #endif
         refractionTransmitted *= brdfData.diffuseColor;
          
         // Use specularFGD as an approximation of the fresnel effect