See this question: [Draw calls using same material][1]
In short: the sphere has too many vertices to batch regardless of whether they use the same material (if you are using the default sphere it has 526 verts).
If you check the [Draw call batching][2] section of the manual it states: "Batching dynamic objects has certain overhead per vertex, so batching is applied only to meshes containing less than 900 vertex attributes in total."
3 draw calls is nothing on any platform. The reason it doesn't batch is because with many vertices the batching has more overhead than another draw call. For some platforms you'll want to stay under 100 draw calls.. but it's not like you have to aim for 1 draw call.
[1]: http://answers.unity3d.com/questions/391307/draw-calls-for-meshes-using-same-material.html
[2]: http://docs.unity3d.com/Documentation/Manual/DrawCallBatching.html
↧
