| Problem | Cause | Fix | |---------|-------|-----| | Black reflections | Missing reflection plane | Add Reflection Control effect → place planes near glass/water | | Flickering in animation | Moving objects + screen-space reflections | Disable "Flicker reduction" or bake lighting | | Grainy shadows | Low Sky Light quality | Increase samples in Sky Light effect to 4+ | | Imported model is tiny | Unit mismatch | Scale in CAD export (set to meters) or use Lumion's Scale tool | | Fire/Volume grid invisible | Camera inside volume | Move camera outside or increase grid density |