Ordered rendering performance

[andersonlucasg3]

There is a problem with the zPosition property of the nodes and the order of rendering of these nodes when they have alpha channels in the texture.
If I have 3 nodes to be rendered:
node1 -> zPosition == 0
node2 -> zPosition == -1
node3 -> zPosition == 1
When the rendering occurs in the order node1, node2, node3, the node1 would be obfuscated by the alpha channel of the other two nodes if they intersected each other.
So I have fixed this issue with a poor solution, that is ordering the children array each time I'm going to render the parent node of these nodes.

Most likely solution:

The most decent approach would be inserting ordered, and updating the order of the children nodes always that the zPosition value is changed.

Open to discussion.