Sometimes you need to re-generate normals of a single mesh or even the whole model. You may need to make them smooth or hard, or even flip them. You can do this in Koru using the Edit Normals tool.
Let’s start with a simple sphere shape with reflective metallic material (Steel for instance):
Now click the Tools -> Edit Normals menu item or the corresponding button in the toolbar to see the normals editor window pops up:
Nothing really changed for the sphere, as by default the normals editor tool runs in “Auto” mode that tries to make normals smooth. As the sphere was smooth enough before we started, there is no much difference so far. However, things will change when we switch to the “Hard” mode that makes all the edges hard:
As you may see, all the edges are now hard and the sphere looks like a disco ball. This is good when you need to focus on sharp edges of the shape.
The other two options are Flip normals and Flip facing. They let you heal inverted meshes that sometimes comes from imporperly exported files or in case of import errors. Try them if you see the inside of your shape instead of the outer side. They usually help.