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Flow Map Tool
Flow Map tool allows painting a flow map that stores direction vectors: a brush stroke changes its color depending on the direction of drawing. The flow map is used to specify the direction of a panner for textures. For example, you can simulate the flow of a river.
Specifies the coordinate space of the flow map: Tangent Space or Object Space.
For example, if you set the Flowmap Range to From negative to positive in the Object Space, the brush stroke color will correspond to the color of the axis along which it is drawn.
Flow Map in Object Space
Specifies the range of values for direction vectors: