Maya + Vray Vector Displacement

1. Extract an Absolute Tangent map from mudbox.

2. Import mesh and assign a shader with a displacement file texture.

3. Between the file and the displacement node you need three nodes:

Multiply

+/- average

blendColors

4. Connect from the file texture (use the "Other..." option):

OutputR -> Input1.X

OutputG -> Input1.Z

OutputB -> Input1.Y

and set multiply input2 values to 0.5 0.5 1

5. Connect multipyl to +/- average input [0].

In the Average node create a new item (under input 3D) and set it’s values to 0.5 0.5 0

6. Connect output from average to blendcolors color1. Set blend to 1.

If you don’t do this step Vray will crash.

7. Connect blendColors to the displacment node

OutputR -> displacement

8. Create a Vray displacement control node for your mesh and set it to Vector Displacement

9. I usually smooth my mesh 2 times before rendering.

10. In renderGlobals under Vray/Misc check the "allow negative shader colors", now render!

result: