I was wondering how I could takes each sphere’s vertex stored in my buffer, and calculate the normal to each of them separately. Is it possible to do it in OpenGL?
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I was wondering how I could takes each sphere’s vertex stored in my buffer, and calculate the normal to each of them separately. Is it possible to do it in OpenGL?
OpenGL is typically used to render meshes, not compute them. And normals are part of a mesh’s data. It is usually the responsibility of the builder of the mesh to supply normals.
In the case of a sphere, normals are dead simple to compute perfectly. For a given vector position P on the sphere who’s center is C, the normal is
norm(P - C), wherenormnormalizes the vector.