Add/Split: Add polygons using the lines between points. In this mode you can add new polygons, as well as split faces and edges, and connect vertices. Use RMB to tweak edges/vertices.

You can use the Add/Split tool as a target weld tool.

Select: In this mode you can select individual vertices, edges and faces. Use CTRL to remove elements from selection. Select an element with LMB, then move (slide) them with RMB.
This command open new panel tools at bottom (Selected and Entire Mesh), see below this page that new commands.
Quick Start Menu In 'Face' mode use INSERT to subdivide faces and DEL to delete. In 'Edge' mode use INSERT to split edges, BKSP to collapse, DEL to remove edges, L to select edge loops, and R to select edge rings, SHIFT to select/highlight edge rings. Select Path: .
Points to Polygons: Add points with LMB. Tweak points and add faces with RMB. (look at preview) Force triangles with SHIFT. Hold cursor close to the center of potential quad for more precise placing of the quad.
Special: Clear Points.

Strokes: Draw strokes and press ENTER to create a polysurface. Press ESC to clear strokes. Draw with CTRL to add splines, and connect and break existing strokes.

Curves/Strokes: It works similar to the strokes tool but uses curves instead of strokes. It operates only over the curves created within this tool! Generally, it takes into account only curves within the 'CurvesStrikes' folder in the curves tree.
2D Primitives: .
R-Fill: This is a Quad Fill tool, designed to fill holes in a mesh with proper topological flow.
Knife: Cut a face by Knife. Draw the line and press ENTER.
Spline Tool: Extrude selected faces along Arc. Angle and Axis of the Arc can be edited by a Transform Gizmo. You can edit the Quantity of Segments and Scale factor. In Spline Mode, you may LMB drag points to move in 3D space and use the Scroll Wheel on Mouse (or equivalent on Wacom Tablet) to interactively scale the geometry of the edge loop surrounding the point the cursor is over.

Free Extrude: Extrude in any direction. Pay attention that new vertices will not be snapped automatically, but they will snap in further operations if you don't turn off Auto snap.
Smart Extrude: Extrude face or edge in any direction. Hitting the ENTER key creates a new extrusion. You can also scale (RMB + Drag) and rotate (SHIFT + Drag) selected faces or edges, interactively.
Smart Extrude part 2:.
Smart Extrude in 3DCoat Part2: Extrude tools have been modified as requested by users. With a new selection, the extrude is automatic when the movement starts. The possibility of working as before is left for Smart Extrude.
Smart Extrude part 3

Inset and Smart Extrude:.
Free Moving: Moving selected faces/edges/vertices. By using mouse or Gizmo. If nothing is selected entire mesh will be transformed.

Surface Swept: Mesh generating by moving profile along selected curve-guide. The grid step frequency is regulated in 2 directions by U,V Spanse. It is also possible to insert additional edge rings at the desired location with a double click near the thick pink or blue curve.
Added mode: “Twist Plots Editable”. The ability to control the rotation along the track sections.

Surface Swept Tool

Profile: Mesh generating by moving profile along Axis or selected curve-guide. The grid step frequency is regulated in 2 directions by U,V Spanse..
Surface Strip: A stripe can be created by drawing a centerline. The width of the strip you can edit near spline points by mouse wheel. You can insert and delete spline points by DblClick. Press Esc to Start draw other Curve.

Rotate Surface: The Rotate surface will be generated by revolution the selected profile around selected curve-axis. The grid step frequency is regulated in 2 directions by U,V Spanse.
Surface by 2 Views: The Mesh generating by moving two conic along curve-guide. You can edit curve. “Surface by 2 Views” is not enable in the Z-Up coordinate system.
Surface Swept 2: Mesh generating by moving profile along two selected curve-guide. The grid step frequency is regulated in 2 directions by U,V Spanse.
Loft Surface: Loft Surfaces are surfaces generated by multiple Curves creating a smooth tangency between the selected curves. Mesh generating by moving across selected curve-section. The grid step frequency is regulated in 2 directions by U,V Spanse.
Swept Surface N Geners: The Sweep Surfaces will be generated by by moving N profiles along two curve-guide. After appear Tool Options dialog You need select second guide and curve-profiles. The new item in VoxTree will be created and the mesh will be placed there. Select the corresponding object in SculptTree to be able to change parameters like thickness, Quantity of facets, smoothing. Delete the corresponding SculptTree element to stop filling the curve.
Surface Patch: Selected curves define the Boundary and geometry of Mesh .The grid step frequency is regulated U Spanse.

Add Geometry tools examples

Brush: This tool works similar to a soft selection. Vertices closest to the center of the brush cursor move more than those at the outer edges. Use SHIFT to smooth vertices spacing.

Keep Bounds While Smoothing: With this option enabled, boundaries will be preserved while smoothing the mesh. Press SHIFT to smooth.\\
Through All Groups: Operating Through All visible Groups.\\

Delete Polygons: Click (individually) or drag cursor along polygons to delete them. Hold the CTRL key to delete connected sets of polygons.
Delete Edges: Delete edges, edge rings, or edge loops. Hold down CTRL key to quickly select & delete entire edge loops.
Collapse: USE LMB on an edge to collapse it. Use CTRL+LMB to collapse edge rings.
Split Rings: Split edge rings with a line.
Move: Tweak vertices, edges, and faces.
Slide Edges: Use LMB to slide edges. CTRL+LMB will slide edge loops.
Measure: Click to add points. Use SHIFT to align lines horizontally, vertically or diagonally. Press ESC to stop measure guide creation. New click will start new guide. Click on lines and points to split lines or drag points. Measure guides may be used in other tools as visual markers or snapping guides.
Show Open Edge: Open Edge of Mesh drawing by Red.

Doubleclick to erase point. Move nearby points together to erase captured point. Use CTRL to avoid snapping to existing points or lines, for example when you need to start new line from existing point or line.

Mark Seams: Mark seams on the UV-Map. CTRL+LMB unmarks a seam.
Edge Loops: Mark entire edge loops on the UV-Map. Use CTRL+LMB to unmark them.
UV Path: Put path along shortest path (under certain criterion) between several points. Click to add points or split line, use RMB or double-click to remove points. Press ENTER to mark seams, CTRL ENTER to delete seams. Use different criterion to adjust path flow.

Transform:Transform selected faces/vertices. If nothing is selected entire mesh will be transformed.
Snap: Snap retopo mesh vertices to the surface. It helps if you have changed the object's state in the scene and want to re-snap retopo mesh. If you are in “Select” tool in vertex mode, then only selected vertices will be affected.
Scale: Scale selected or entire mesh. Each connective cluster will be transformed separately.
Relax: Relax the entire retopo mesh or subset. If you are in “Select” tool in vertex mode then only selected vertices will be affected.
Import: Import retopo mesh.
Export: Export poly mesh.
Subdivide: .
Delete Mesh: .
Symmetry: Apply symmetry to the mesh.
Unwarp: Fit all islands onto the UV map.
Store Selection: .
Load Selection: .
Clear Selection: .
Save Contour: This command allows to save contour in real scale as EPS or DXF for further laser cutting. Length of lines corresponds to geometrical length. It is helpful if you want to cut shape using laser cutter and glue parts together.

Expand: Expand the area of selected elements.
Contract: Contract the area of selected elements.
Transform: Transform selected faces/vertices. If nothing is selected entire mesh will be transformed.
Free Extrude: Extrude in any direction. Pay attention that new vertices will not be snapped automatically, but they will snap in further operations if you don't turn off Auto snap.
Cut Edges: Cut Edges into equal segments. User will pre-determine the number of segments along the selected edge(s).
Snap: Snap retopo mesh vertices to the surface. It helps if you have changed the object's state in the scene and want to re-snap retopo mesh. If you are in “Select” tool in vertex mode, then only selected vertices will be affected.
Scale: Scale selected or entire mesh. Each connective cluster will be transformed separately.
Relax: Relax the entire retopo mesh or subset. If you are in “Select” tool in vertex mode then only selected vertices will be affected.
Rotate CW: Rotate selected edges clockwise.
Rotate CCW: Rotate selected edges counter-clockwise.
Extrude: Extrude selected edges.
Split: Select several edges, chen click Split. Move mouse over edges to specify split position, then click to split. You may use the INSERT key to trigger this tool and split selected edges.
Collapse: Use BKSP to collapse selected edges.
Delete: Use the DELETE key to delete selected edges.
Edge Loop: Press L to select an edge loop. Select two edges on one edge loop to limit the effect.
Edge Ring: Press R to select an edge ring. Select two edges on one edge ring to limit the effect.
Sel.Sharp: Select sharp edges.
Bevel: Bevel selected edges.
Split Edge: Split the selected Edges.
Bridge: By selecting two edges you can create a face.
Set Seams: Mark selected edges as seams (in UV Preview Window).
Delete UV Seams: Delete seams over selected edges (in UV Preview Window).
Store Selection: Store Selection.
Load Selection: LoadSelection.
Clear Selection: Clear Selection.

Import: Import retopo mesh.
Export: Export retopo mesh.
Subdivide: Subdivide poly mesh.
Smooth Selection CC: Subdivide and smooth selected faces using the Catmull-Clark algorithm.
Delete Mesh: Delete poly mesh.
Symmetry: Apply symmetry to the mesh.
Unwrap: Fit all islands onto the UV map.
Save Contour: This command allows to save contour in real scale as EPS or DXF for further laser cutting. Length of lines corresponds to geometrical length. It is helpful if you want to cut shape using laser cutter and glue parts together.