Hello,
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To create a moving sky with clouds by adding a shape, like a dome, and put a video of clouds on it.
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If your scene has sunlight but it’s not reaching inside, change the sun angle in the Light tab.
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For a steam effect, use a flat surface with a video showing the steam, but make sure the video has a see-through background.
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It’s not possible to show dimensions on minimap.
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For opening and closing the doors please read this: Open and Close Door with trigger in Shapespark?