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vec3 sampleNormalTexture(in sampler2D sampler, in float factor, in vec2 texCoord, in vec3 tangent,
in vec3 binormal, in vec3 normal)
{
vec3 tsNormal = 2.0 * texture(sampler, texCoord).xyz - 1.0;
return mix(normal, normalize(tsNormal.x * tangent - tsNormal.y * binormal + tsNormal.z * normal), factor);
}
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