From f742f40169399926d1e254e819307db4e193220f Mon Sep 17 00:00:00 2001
From: ud18010 <ud18010@xworld.ren>
Date: Wed, 15 Jul 2026 10:53:12 +0800
Subject: [PATCH] XPbr: remap sphere-map normal decode to signed range for
 ModelTranslator

---
 Client/Assets/Game/shader/XShader/XPbr_Base.hlsl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Client/Assets/Game/shader/XShader/XPbr_Base.hlsl b/Client/Assets/Game/shader/XShader/XPbr_Base.hlsl
index 6744f6d7..23592b91 100644
--- a/Client/Assets/Game/shader/XShader/XPbr_Base.hlsl
+++ b/Client/Assets/Game/shader/XShader/XPbr_Base.hlsl
@@ -65,9 +65,10 @@ struct Varyings
 		UNITY_VERTEX_OUTPUT_STEREO
 };
 
-//解码 RG 两通道球面映射压缩法线（与 XTex 的 MixTex 资源格式一致）
+//解码 RG 两通道球面映射压缩法线（有符号，ModelTranslator 工具编码：enc = n.xy/sqrt(2*(1+n.z)) * 0.5 + 0.5）
 float3 DecodeSphereMap(float2 encoded)
 {
+    encoded = encoded * 2.0 - 1.0;    //rg 无符号存储，重映射回有符号
     float4 nn = float4(encoded, 1, -1);
     float l = dot(nn.xyz, -nn.xyw);
     nn.z = l;