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Calculating view angle for relief mapping

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I am having some problems with calculating my viewing angle for stepping into the height map when doing relief mapping.

The relief mapping is working, at least kind of. Currently it is only displays the correct result in the positive Z axis (up).

float3 viewDir = fragment.fragmentWorldPos.xyz - cameraPosition;
float3 viewDirNormal = normalize(viewDir);

float rayX = dot(worldNormTangent.xyz, -viewDirNormal);
float rayY = dot(worldNormBinormal.xyz, viewDirNormal);
float rayZ = dot(worldNormNormal.xyz, viewDirNormal);

float3 rayDir = float3(rayX,rayY,rayZ);
rayDir *= depthScale / rayDir.z;
float2 textureOffsetDirection = rayDir.xy;

Any help would be greatly appreciated

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