Unity Engine documentationScript ReferenceUnityEngineAdditionalCanvasShaderChannelsTangentInclude the Tangent on the mesh vertices.Read time 1 minuteLast updated 11 days agoDefinition Type: Field Namespace: UnityEngine Assembly: UnityEngine.UIModule Tangent = 16 Remarks This channel isn't likely needed unless you are expecting lighting to be applied to the Canvas. Reminder that a Overlay Canvas can not have lighting applied.