## Other Lighting Options  *Sky Light (8:00am).*  *Sky Light (noon).*  *Sky Light (5:30pm).*  *HDRI (Entrance Hall Pano) with Radiosity (default settings).*  *Glowing Torus with Radiosity (Rmin 0.001, Samples 5000, Detail Detection on) and Camera Light set to off (if auto, it will turn on and ruin image).*  *Camera Light. (Just say “No!”)* In addition to the basic light object, Cheetah 3D provides several other methods of lighting a scene. - The **camera light** (essentially a point light with no attenuation located where the camera is; by default, it is only active if a scene has no other lights in it). > **Note:** needs checking in Cheetah 3D 8.1.1: the manual describes **Camera light** as an on/off property of the camera that you disable once you have your own lights (Objects/SceneObjects/Camera); is there still an “auto” setting? (Also the Glowing Torus caption above.) - The **Sky Light** (a basic sky simulation which provides a passable simulacrum of the light produced by the sun and sky). > **AI draft:** generated from the Cheetah 3D 8.1.1 manual; not yet reviewed by the author. - **Image-based lighting** (if you add an **HDRI Light** object to your scene and load a suitable .hdr or .exr image into it, the image will light your scene; with the Cheetah renderer, also turn on **Radiosity** in its render settings, choosing Ambient occlusion or Radiosity). - **Emissive Objects** can light a scene with Falcon, or with the Cheetah renderer when **Radiosity** is turned on in its render settings (these work particularly well with judiciously chosen Radiosity settings). > *End of AI draft.* To make an object “emissive” you need to create a suitable material — generally using the Material shader. The light emitted is the diffuse color multiplied by the emissive color. > **Note:** needs checking in Cheetah 3D 8.1.1: is no light still emitted when the diffuse color is black, in both renderers? **Note** that if the diffuse color is black, no matter what the emissive color is, no light will be emitted. I consider this to be a bug, but apparently it’s a feature. Note that to create a strongly emissive material you need to use a Color constant node (or some other vector of arbitrary size) to drive the Material Shader’s emissive channel — which allows you to dial up the intensity of the emission.