When the glass material's refractive glossiness is set to <1, Vantage does not render the blurred background HDRI correctly

Vantage Issues
1

When the glass material’s refractive glossiness is set to 0.98, Vantage does not render the blurred background HDRI correctly

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2

Hi hill_Iam,

This is expected if you have used a Background override image in Vantage as glossy reflection/refraction is not currently supported for Background images. The Use for refraction/mirror reflections option in the Background rollout is used only for pure (meaning 1.0 in value, anything below is glossy) reflections and refractions - it will use the environment map and not the background one. You can check here with a sample scene, the front 2 spheres have glossy(<1) reflection and refraction and the back ones have pure(=1) reflections/refractions https://imgsli.com/MjE2MTAw/0/2 . So this is not a bug, this is how it currently works until we improve the Use for refraction/mirror reflections ​option to work with glossy refractions/reflections(LAV-1650). You can check this thread here where it was initially discussed Background - Use for refraction/mirror reflection - Not Working - Vantage :: Issues - Chaos Forum

Best regards,
Alexander