> ## Documentation Index
> Fetch the complete documentation index at: https://docs.spline.design/llms.txt
> Use this file to discover all available pages before exploring further.
# 3D Modeling Tools
The modeling tools enable you to edit geometries to create more complex shapes.
To edit a geometry, press `Smooth & Edit` from the Shape panel in the right sidebar. After this, the object will be now converted into a [subdivision surface](https://en.wikipedia.org/wiki/Subdivision_surface).
You can Extrude, Inset, or generate Edge Loops:
You can add Loop Cuts and use the Slide Tool to reposition the edges:
Also, you can modify and dissolve vertices (points), faces (polygons), or edges (lines):
Finally, you can fill holes by selecting the edges:
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The following parameters can be adjusted under the settings menu:
### Extrude & Inset Mode
Controls if the selected geometry will be extruded or insetted grouped or individually.
### Extrude Direction
Controls the direction of the edges when extruded.
### Selection Side
You can specify which side should be affected (both or front only).
### Selection Mode
You can change the selection mode and adjust the radius of the paint selection
### Hole Filling
You can specify if the geometry of filled holes will be Flat, Curved or Ngon.