Ear tangent space vector displacement map from Mudbox (left). Polygon plane displaced with ear vector displacement map (right). Traditional displacement maps are not used for any surface change that is not perpendicular to the base mesh’s polygons. Vector displacement maps can displace in directions other than the face normal, which is much more flexible. Vector displacement uses the color channels that specify a vector in a certain space to displace the vertices of the geometry in that direction and magnitude.
Ear.exr vector displacement map connected to vector_displacement shader
Input
Connect the vector displacement map to this input.
Tangent Space
Normal
The normal and tangent parameters can be optionally linked to define a custom tangent coordinate system that the input is transformed from. If the normal is not linked, it will use the default surface normal.
Tangent
The tangent map. Together with the shading normal, it defines the tangent coordinate system that the input vector applies to. If available from your sculpting tool, you should connect here the tangent map that the normal map relies on. If 0, the shader attempts the following actions to build the frame: The shader works in tangent space only. If your tangent map was exported in either world or object space, you can instead use the more generic space_transform shader.
Order
Lets you shuffle the input channels order.
Invert X/Y/Y
Color to Signed
Controls the amount of displacement. Displacement_height can have either positive or negative values. This attribute only applies to normal displacement. You can use this value to compensate for any inconsistencies between the exported displacement map and the low-resolution geometry.
Scale
Controls the amount of displacement. Displacement_height can have either positive or negative values. This attribute only applies to normal displacement. You can use this value to compensate for any inconsistencies between the exported displacement map and the low-resolution geometry.
Further example: Sea waves are displaced using a vector map (right)