If you're interested in developing rendering engines or similar, consider exploring open-source projects like Blender, which offers a wide range of 3D creation capabilities, including modeling, rigging, animation, rendering, and more.

If you're serious about using Lumion for your projects, consider purchasing a license. Lumion offers various pricing plans, including a free trial, subscription-based models, and perpetual licenses.

If you're looking to "crack" a trial version, you might also consider reaching out to the software provider directly for:

models and Lumion, so any changes made in the CAD software update instantly in the visualization environment. Custom Displacement Maps