Grant Warwick- Mastering Vray: Material Ideas Needed.

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@Richard7666

It looks to me like ur Dome lights its night or sunset. Which are the hardests IBL cases to clean up. I suggest 128 Sub D on dome and light. Also use Adaptive subdivision with values 1-2. It should render a lot faster than Adaptive DMC and be quite clean. If its still noisy Id up the IBL subD.

Indeed, it is! I’m wondering if cranking up the intensity multiplier of HDRI will not get it render faster? Sadly, it can’t be apply in this scene.
But it seems that lighter is the scene and faster is the render.