What typically causes light leaks in a scene?

Light leaks in a scene are primarily caused by light passing through gaps in geometry. This situation occurs when there are small openings or spaces between meshes where light can shine through, leading to unwanted illumination effects that disrupt the intended lighting design of the scene. This can often happen when the geometry of objects does not completely seal, such as when walls are not perfectly aligned or if there are unseen holes in the model.

When developing a scene, it's crucial to ensure that all geometries are well-aligned and that there are no gaps, as this can significantly impact the aesthetic and realism of the environment. Properly solid geometry helps ensure that light behaves as expected and contributes to achieving the intended visual style. Addressing these gaps often involves careful modeling and using techniques like lightmapping to minimize light leaks and achieve more accurate lighting results.