The W Coordinate texture node enables hair strands to receive a color gradient along the length of the entire strand. The W Coordinate is used to address the vertex coordinate system of each hair strand. Without the W Coordinate, Octane will apply a solid color along the entire length of a strand of hair.  

How to Use

To use Hair in Octane, review the "Rendering / Hair Rendering" section, here. The following example material setup should be assigned to the hair object itself. Once an Octane Gradient node is created and the colors chosen, connect the W coordinate Node to the input section of the gradient. Finally, to see the hair render in Live Viewer, assign the Octane Object tag to the object to which you assigned the hair and check the "Render as Hair" option in the Hair tab of the tag.

W coordinate