IMM Shapes:
IMM - "Insert Multi Mesh" - shapes are additional Tools that can be drawn into a model, subtools that exist separately in a project and can be altered and sculpted in a manner similar to the primary Tool. There are a variety of different types of IMM, ranging from primitive shapes to industrial parts and humanoid meshes.
Some IMM shapes - known as "IMM Curves" operate in a different manner, being drawn onto models in lines. The 3D form of the IMM is then constructed around this line.
Dynamesh can be used to weld an IMM shape to a Tool. This can be used when an IMM is interacting with Tool geometry.
Additionally, the "reverse dynamesh" operation can subtract from base shape. This cuts out matter from a model where the IMM intersects with the primary Tool. To do this, hold ALT when drawing in the IMM and then hold CTRL when activating the Dynamesh functionality.
Zspheres:
To access Zspheres, go into the Tool tab, Right Click "Simple Brush" and select Zsphere. This can then be drawn into the project space like a standard Tool. Once the Zsphere has been drawn in, Edit mode can be activated, allowing for new Zspheres to be drawn in. These connect to pre-existing Zspheres and can be moved and scaled using the transpose tool. Zspheres connect to one another in chains, and these chains can be altered and moved as the Zspheres they connect to are transposed.
Zspheres can be converted into sculpt able material by adding an "Adaptive Skin" to the model. This turns the Zspheres into polygons. Pressing "A" previews how the model will look when the Adaptive Skin has been added to it.
When the Adaptive Skin process is finalised the model can be Sculpted upon and altered in a completely free manner. As such, I practiced sculpting on the Zsphere model I had previously created. In this I largely used the Move and Standard Brush tools with symmetry turned on. I additionally used the Crease tool to create sharped pinches across the model and smoothed out areas in which shrp polygons could be found.
Base Meshes:
A "Base Mesh" is a basic model that describes the overarching forms - muscular and otherwise - of human anatomy. These are useful when creating character models as they allow for a basic human form to be manipulated and altered, allowing for simpler creation of human forms in ZBrush. IMM brushes are particularly useful in this, as they can be drawn in to create the basic forms that can then be molded into limbs and body masses.
For example, I used the basic Sphere Tool to form the basis of a torso, then used the Capsule IMM Brush to create the overarching forms of the upper and lower leg. These forms can then be individually masked to allow for easy none-destructive manipulation, not altering the other forms of the model.
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