Nodes > Math > Geometric > FaceForward
Flips the supplied surface normal to face in the opposite direction I. If it already faces away, return the normal as-is.
Inputs
| Name | Type | Description |
|---|---|---|
| N | float | Normal to flip |
| I | float | Incidence vector (usually direction vector from camera to vertex) |
| NRef | float | Reference vector to compare against I |
Outputs
| Name | Type | Description |
|---|---|---|
| faceforward( N, T, NRef ) | float | Normal vector that faces the opposite direction of I |
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