Hello, I'm 'testing the waters' with Vue 6 Esprit.  I just got it last week while playing with easel, and I too am working on the Spectral Atmosphere, which I find it amazing compared to the Standard and Volumentric Atmospheres.

Here's a test render I did, still not done with adding some things, but worth a try out.  I used Spectral, the MetaClouds (both top and bottom) with Ambient Occlusion, the procedual terrains, and I made a quick lookout tower in Hexagon -- in all, it took 9 1/2 hours to render.

By the way, I am a new user at Vue, been a Poserholic for 3 1/2 years.

Here's a go at it.

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Asus N50-600 - Intel Core i5-8400 CPU @ 2.80GHz · Windows 10 Home/11 upgrade 64-bit · 16GB DDR4 RAM · 1TB SSD and 1TB HDD; Graphics: NVIDIA Geforce GTX 1060 - 6GB GDDR5 VRAM; Software: Poser Pro 11x