One of the most important uses of Slicer is to create three dimensional reconstructions of anatomical structures, using two dimensional slices as input. This type of reconstruction is called a 3D model. The input to this process is label map data that has been created with Slicer's editing tools.
To create a 3D model:
  1. From the Main menu, click ModelMaker. The ModelMaker panel appears.
  2. Click the Create tab. The Create panel appears.
  3. Select the Volume.
  4. Click Label and select a color, or enter a Label color number. This is the value that will be used to create the model. This should correspond to the value in the label map.
  5. Enter a Name for this model.
  6. Enter a Smooth value, which controls how smooth the resulting model will be.
  7. Enter a Decimate value, which indicates how redundant polygons will be reduced.
  8. Click Create to start the model creation process.
Here is an example. Below is a skull image segmented using the Threshold effect. All voxels labeled 4 (blue) will be included in the resulting model.

Below is the resulting 3D skull model.