That's right, Poser cannot meaningfully preview layers, which is why I tend to avoid them completely and use a slaved, identical figure with a water droplet and volumetric absorption shader with caustics and refraction turned on. Simply because I need the preview to give me something that isn't complete garbage that layers present as until rendered. Often, I'll change the droplet slave figure to outline mode, so I know it's there, but it doesn't interfere until I need to render.

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My ShareCG Stuff

Verbosity: Profusely promulgating Graham's number epics of complete and utter verbiage by the metric monkey barrel.