I import cube.fbx, It is very simple cube made in 3DMax.
The weird thing is that I check that mesh’s Vertex count and that points 24.
cube’s vertex is 8 right? there were count 3 times the same vertices.
Why this happen?
A vertex has several other “attributes” associated, like the uv coordinates and the normal. You must have independent vertices for each face of a cube (6 faces X 4 vertices = 24 vertices), since their normals (and many uv coordinates) are different from the other faces. For a smooth volume like a sphere, vertices can be shared by two or more triangles when their uv and normals are equal - but even in this case some of them have identical normals but can’t be shared because their uv coordinates differ.