Reflection effect doesn't work on black background or black mesh

Inter, epoxy resin (forked) - CodeSandbox

Why doesn’t the effect work over a black background or a black mesh ?

Your sphere is using a mesh Basic Material which doesn’t include the necessary channels for environment reflectivity, try using a MeshStandardMaterial with roughness at 0 and metalness at 0.5…

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And if you want to control reflectivity, then use MeshPhysicalMaterial.

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Ok thank you :slight_smile: