I need to transform both vertex and normals between these coordinate systems:

OpenSceneGraph: X right, Y into the page, Z up
Unity: X right, Y up, Z into the page

As far as I can tell, changing between right and left handed coordinate systems can simply be acheived by swapping two axis. For example swapping z with y should be enough.

So my questions are:

1. What about the normals? Would swapping their axis be enough?
2. If I need to rotate the model after converting the normals to the correct coordinate system, do I simply apply that rotation matrix to the normal vector, as I do to the vertex point?

you just need swap members in transform matrix

https://stackoverflow.com/questions/1263072/changing-a-matrix-from-right-handed-to-left-handed-coordinate-system

33 minutes ago, Makusik Fedakusik said:

you just need swap members in transform matrix

https://stackoverflow.com/questions/1263072/changing-a-matrix-from-right-handed-to-left-handed-coordinate-system

Yes then I was right about swapping the two axis. But what about the normals?