I tried to improve performance of drawing models in my game. I tried with “glDrawElements(GL_TRIANGLES, …)”, before I found out, that it gives pure profits.
It is common, that some points are shared beetween triangles. It happens, that they have got identical position, and teture coordinates. But it’s rare, that they have same normals. They do, only if they situated on a same plane (well, parallel, but they have same position, so it’s the same).
Is there any way to specify different indexes for one point in arrays of Vertex, TexCoords and Normals? If not, how to improve rendering, if used type defines model as a set of triangles?