Node Description and Purpose: The Enviro Light node provides Global Illumination lighting to a scene, with separate control over the strength and color of the effect as applied to surfaces and atmosphere. Use of the Enviro Light allows for much more realistic lighting and shadows in your scene. The Enviro Light is a part of every default scene and its use is recommended for best results. However use of Global Illumination also increases render time and can cause issues in consistency between frames of an animation. Quality settings for Global Illumination are controlled in the Render node.
Node Type: Lighting
A single object or device in the node network which generates or modifies data and may accept input data or create output data or both, depending on its function. Nodes usually have their own settings which control the data they create or how they modify data passing through them. Nodes are connected together in a network to perform work in a network-based user interface. In Terragen 2 nodes are connected together to describe a scene.