Fix ibl direction (#916)

* refactor: fix skybox mirror problem * fix: TextureCube is left-hand,so x need inverse (#855) Co-authored-by: ChenMo <[email protected]>
galacean · Aug 3, 2022 · f1ada73 · f1ada73
1 parent d3e3f6e
commit f1ada73
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/packages/core/src/shaderlib/extra/skybox.vs.glsl b/packages/core/src/shaderlib/extra/skybox.vs.glsl
@@ -6,8 +6,8 @@ varying vec3 v_cubeUV;
 
 void main() {
 
-    v_cubeUV = POSITION.xyz;
+    v_cubeUV = vec3( -POSITION.x, POSITION.yz );// TextureCube is left-hand,so x need inverse
     gl_Position = u_mvpNoscale * vec4( POSITION, 1.0 );
     gl_Position.z = gl_Position.w;
 
-}
+}
diff --git a/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl b/packages/core/src/shaderlib/pbr/ibl_frag_define.glsl
@@ -2,6 +2,7 @@
 
 // sh need be pre-scaled in CPU.
 vec3 getLightProbeIrradiance(vec3 sh[9], vec3 normal){
+      normal.x = -normal.x;
       vec3 result = sh[0] +
 
             sh[1] * (normal.y) +
@@ -51,6 +52,7 @@ vec3 getLightProbeRadiance(vec3 viewDir, vec3 normal, float roughness, int maxMI
     #else
 
         vec3 reflectVec = reflect( -viewDir, normal );
+        reflectVec.x = -reflectVec.x; // TextureCube is left-hand,so x need inverse
 
         float specularMIPLevel = getSpecularMIPLevel(roughness, maxMIPLevel );