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====== Light sources ======

A LightNode in GroIMP works similar to light socket where different lights can be "screwed" into. 

The Light simulates a directional light source and can be placed into the scene similarly to primitive objects. It controls the direction, intensity, and color of the light that affects the appearance of surfaces and shadows in the scene. 

All light types (except the SunskyShaders) can be set to shadowless mode, disabling shadow casting. Rays can be vizualized and adjusted.


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