Retopo Tweak Tools

Sharp Edges: Mark edges as sharp. Normals will be split along that edges.
Brush: This tool works similarly 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.

It can be used to “Tweak” a set of vertices based on a “soft selection” determined by the size of the Brush. Holding down “Shift” while using this tool causes the brushed polygons to be “relaxed” or smoothed.

Delete Polygons: Hover the mouse cursor over a polygon until it highlights, and “Left-Click” to delete it. Use CTRL to delete connected sets of polygons. See also.
Delete Edges: Hover the mouse cursor over an edge until it highlights, and “Left-Click” to delete it. Use CTRL to select edge loops quickly.
Collapse: Hover the mouse cursor over an edge until it highlights and “Left-Click” to cause the two vertices joined by the edge to become one vertex. USE LMB on the edge to collapse it. Use CTRL+LMB to collapse edge rings.
Split Rings: Create new edge loops and adjoining edges by highlighting a row of edges and “Left-Clicking”.
Move: This is a general “Tweak” tool for moving vertices, edges, edge loops, or faces – depending on which you have enabled in the “Brush Command Panel”.
Selecting “Auto” in the panel allows you to move any topological element on the fly.
Slide Edges: Adjust the spacing between any row of edges by highlighting the desired edge and dragging it with the “Left-Mouse” button held down. 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. A new click will start a 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.

Double-click to erase the 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 a new line from an existing point or line.

Tutorials

Retopo Workspace Pt.5 (Edit Geometry): This Quick Start tutorial covers the tools in the EDIT GEOMETRY section of the Tool Panel in 3DCoat’s Retopo Workspace.