(GI tab)
Use these settings to quickly check lighting and materials without long wait times. if you have a powerful NVIDIA GPU; otherwise, stay on Interactive Progressive rendering to see changes in real-time. : Set the slider to Resolution : Keep it low, such as 800 x 450 px , to speed up calculations. 2. Final High-Quality Rendering
Without GI, your scene looks like a flat CAD model. GI calculates how light bounces off walls, floors, and ceilings.
The most critical decision a user makes occurs at the very top of the settings window: choosing between the (CPU) and the V-Ray GPU Engine .