Tangent to Surface Normal
- Where to find it:
- Add Adjustment Layer / Extension Pack / Normal Map /
- NodeGraph / Right Mouse Click / Nodes / Filter / Extension Pack / Normal Map /
The Tangent to Surface Normal Adjustment Node allows you to convert your Tangent Space Normal Map into a surface Normal that
many Mari default nodes can use (Triplanar etc.) in their Calculation, when attached to their 'Normal' Handle in the Nodegraph.
It provides a way to make Mari aware of fine details and surface normals from highres models, when working with lower res geo.
On the left the normals generated with a 'Surface Normal' Node on a lowpoly model.
On the right the normals generated with the 'Tangent to Surface Normal' Adjustment over a Normal Map.
The 'Manifold' connection can be used to feed in a coordinate system for the evaluation of the gradient.
- Invert Red
Will invert the Red Channel of the attached Normal Map
- Invert Green
Will invert the Green Channel of the attached Normal Map
OpenGl vs DirectX Normal Map
Mari's Shaders by default expect a Direct X Normal Map.
If you have an OpenGl Normal Map you will have to invert the Green Channel to get a Direct X Normal Map
- Switch Red/Green
Allows you to swap the Red/Green Component of a Tangent Space Normal Map attached to the Node in the