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https://forums.chaos.com/forum/v-ray-for-3ds-max-forums/v-ray-for-3ds-max-problems/1174406-vray-6-1-clouds-shadow-problem#post1174593
With regards to this thread - the method to have clouds in your scene, but not casting heavyu shadows into the scene is to create two sub objects and turn off various options.This is clumsy as hell - please just give us an option to do it properly.