Question: I have bunch of objects that I want to position next to each other in a scene. When they are next to each other, there is an apparent seam between them due to different normal directions. The normal directions are this way, of course, because the two objects are of a different mesh.

**Is there a way to manually change the direction of normals for specific vertices like in 3DS Max, Maya, etc.?**

[![enter image description here](https://i.stack.imgur.com/D2G60.png)](https://i.stack.imgur.com/D2G60.png)

Answer: 
I think it is answered by Anthony Forwood:

> 
> The Blend4Web add-on allows you to manually edit normals.
> 
> 
> 

The add-on itself can be downloaded from [here](https://www.blend4web.com/en/downloads/). Documentation on how to use it can be seen [here](https://www.blend4web.com/doc/en/normal_editor.html).
The only method that I know of is to influence the normals by using the Normal Edit Modifier and it works only if you have two or more objects and not one object with several submeshes. 

1. In Object Mode, select Object1, go to "Properties Window -> Data"
and enable "Auto Smooth".
2. With Object1 still selected, go to "Properties Window -> Modifiers
-> Add Modifier -> Modifiy -> Normal Edit".
3. Keep "Radial"and under "Target Object" select Object2.
4. Repeat steps 1-3 for Object2, only with Object1 as target.

[![normal edit modifier](https://i.stack.imgur.com/iZVMW.gif)](https://i.stack.imgur.com/iZVMW.gif)

Since gif isn't suitable to display the "before" and "after" images, here's a jpeg to illustrate the difference.

[![enter image description here](https://i.stack.imgur.com/eJ864.jpg)](https://i.stack.imgur.com/eJ864.jpg)

I only tested this once with Leadwerks Game Engine and there it seemed to work.