There are two primary ways to move from Lumion 12.0 to a more stable version like or 12.0.2 : Full Update (Recommended):

The , released in November 2021, is widely regarded as a significant refinement update that prioritized atmospheric detail and workflow usability over radical engine overhauls. For many users at Brightman Designs and within the architectural visualization community, it transformed "fine-tuning" from a chore into a creative strength. Key Strengths: Realism in the Details

How to using the current Lumion 2024 features? A deeper look at AI-driven lighting in 3D design?

A new object category with over 140 options to add character to surfaces, including water stains, bricks, moss, and road markings. Expanded Library:

If you are trying to fix a specific where an object appears hollow, could you describe the CAD software you are using (e.g., Revit, SketchUp) and where the "solid" look is failing? Lumion 12.0.1.1 Hotfix (only for Lumion 12.0.1 users)