使用法线在opengl中使用.off

Question

How can i put the right normals to the object? There is a way to transform from .off into an object that contains normals?

Answer 1

OFF files usually don't support special attributes per face or per vertex and thus have no normals.

The simplest thing you can do is do simply calculate the normals yourself using one of the well-known and easy to implement face-normal algorithms. Here are a few examples.

Answer 2

You can also look at doing normals via a texture (aka bump mapping ). You will basically need to generate a normal map of your models in a 3D program and be using some kind of perpixel shading and bind your shades to use the normal texture.

The advantage to doing it that way is you can have higher detail without increasing the number of polygons. You can do things like generate a single grainy bumpy stone pattern on a single flat polygon.

Also if you generate your normals procedurally you can't mix flat and smooth shading.