threejs-lighting

To configure realistic lighting and shadows in Three.js, you must enable shadow maps and adjust shadow camera frustums. Using Directional or Spot lights with correct bias settings prevents rendering artifacts while illuminating architectural visualizations or product renders accurately.

Image-Based Lighting (IBL) in Three.js uses HDR maps and cube textures to provide realistic ambient illumination and environmental reflections. Loading an HDR file as an environment map allows your materials to capture natural light distribution across your 3D models.

Use RectArea lights in Three.js for studio-style lighting with defined rectangular emissive surfaces, such as softboxes. Point lights emit illumination omnidirectionally from a single location, making them better suited for simulating bare bulbs or localized dynamic light sources.

To optimize shadow performance for multiple light sources in WebGL, you should carefully manage shadow map resolution and utilize light layers. Limiting shadow-casting objects and adjusting shadow camera bounds reduces the rendering overhead associated with dynamic shadow calculations.

Yes, Three.js supports dynamic light animations for daylight cycles by programmatically updating light positions and intensities. You can animate Directional lights to simulate the sun's trajectory, adjusting shadow camera parameters dynamically to maintain consistent illumination.