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Adding and merging objects during the sculpting process in Blender is a feature I often use.  A great addon for this is the BoolTool with which you can execute boolean operations without destroying the quality of your topology.

Here is a simple example to demonstrate some drawbacks when adding objects to your sculptings and how to avoid these using the BoolTool. Let’s start with the following head sculpt:

sculpted head

sculpted head

If you want to create the neck you could add a new cylinder and adjust it’s position and rotation:

added_cylinder

Then we would add some edge loops and move around the vertices with proportional editing to create a basic shape of the neck:

add edge loops

add edge loops

And would end up with something like this:

Two objects in wireframe mode

Two objects in wireframe mode

In this wireframe mode (Z key) you can see that the two objects are overlapping. The normal way to combine two objects is to use the Join operation:

Join objects

Join objects

But if we would go on sculpting this object we will get the following errors because our topology is not merged correctly, the objects are still overlapping:

seams for objects

seams for objects

And this seams can’t be smoothed away in sculpt mode with a smooth brush.

The Blender addon BoolTool can be used to union the two objects to one object that has a topology that we can sculpt with without getting topological errors. First you have to download and install the BoolTool. After installation (follow the instructions in the readme)

BoolTool addon

BoolTool addon

you can select the two objects in Object Mode and use the Direct Union operation:

Direct union with bool tool

Direct union with bool tool

Now you get one object with a clean topology. Switch to sculpt mode and use a brush like the Clay Strips and enable Dynamic Topology in the Dyntopo panel:

Enable dynamic topology

Enable dynamic topology

With that brush you can sculpt and smooth the object now without getting ugly seams:

No seams for unioned objects

No seams for unioned objects

Sculpting with object merged

Sculpting with object merged

I really hope you liked this sculpting tip. Of course the BoolTool has many other features that we will explore together in another tutorial.

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