XPbr: remap sphere-map normal decode to signed range for ModelTranslator

2026-07-15 10:53:12 +08:00
parent 005cc8f699
commit f742f40169
1 changed files with 2 additions and 1 deletions
@@ -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;