diff --git a/samples/03_model_render/shader/eqrectToCube.cs.hlsl b/samples/03_model_render/shader/eqrectToCube.cs.hlsl
index 7d822ff..9629338 100644
--- a/samples/03_model_render/shader/eqrectToCube.cs.hlsl
+++ b/samples/03_model_render/shader/eqrectToCube.cs.hlsl
@@ -12,11 +12,11 @@ Block pcb;
 
 float2 SampleSphericalMap(float3 v)
 {
-    const float2 invAtan = float2(0.1591f, 0.3183f);
-    float2 uv = float2(atan2(v.x, v.z), asin(v.y));
-    uv *= invAtan;
-    uv += 0.5;
-    return uv;
+    const float2 InvTan = float2(0.1591f, 0.3183f);     // (1/2PI, 1/PI)
+    float2 UV = float2(atan2(-v.x, v.z), asin(-v.y));   // (-PI, -PI/2) to (PI, PI/2)
+    UV *= InvTan;                                       // (-1/2, -1/2) to (1/2, 1/2)
+    UV += 0.5f.xx;                                      // (0, 0) to (1, 1)
+    return UV;
 }
 
 /*
@@ -39,15 +39,15 @@ void main(uint3 GlobalInvocationID : SV_DispatchThreadID)
     
     if (GlobalInvocationID.z < 2)
     {
-        LocalDir = float3(AxisSign * HalfSide, GlobalInvocationID.y - HalfSide, (GlobalInvocationID.x - HalfSide) * AxisSign);
+        LocalDir = float3(AxisSign * HalfSide, HalfSide - GlobalInvocationID.y, (HalfSide - GlobalInvocationID.x) * AxisSign);
     }
     else if (GlobalInvocationID.z < 4)
     {
-        LocalDir = float3(GlobalInvocationID.x - HalfSide, -AxisSign * HalfSide, -AxisSign * (GlobalInvocationID.y - HalfSide));
+        LocalDir = float3(GlobalInvocationID.x - HalfSide, AxisSign * HalfSide, AxisSign * (GlobalInvocationID.y - HalfSide));
     }
     else
     {
-        LocalDir = float3((GlobalInvocationID.x - HalfSide) * AxisSign, GlobalInvocationID.y - HalfSide, -AxisSign * HalfSide);
+        LocalDir = float3((GlobalInvocationID.x - HalfSide) * AxisSign, HalfSide - GlobalInvocationID.y, HalfSide * AxisSign);
     }
     
     float2 UV = SampleSphericalMap(normalize(LocalDir));