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Reference: setLight

setLight(b) turns realistic lightning of 3D objects on (true) or off (false).

Generally, geometric objects such as boxes, cones, spheres and cylinders that are drawn using the special functions drawBox3, drawCone, drawSphere, and drawCylinder are best viewed with lightning, whereas curves and point sets are best drawn without lightning.

Examples: setLight(true) or setLight(false)