TerrainAxe(利斧)

RoundVerts  not only help you get an arc apperance ,but also optimize polyon model by decreasing or increasing the number of vertices .

Usually ,a road net is turned from spline shape, the number of vertices in corners maybe insufficient or too many,you often need to keep a balance between vertex number and its accuracy.With RoundVerts,you don't need to worry about the shape steps in shape-editing stage.

RoundVerts

Ajust Verts Number

1. Subdivid: subdivid each of the selected edges to the specified number of vertices

2. Remain:Add or remove vertices to keep selected vertices to the specified number

3. MakeArc(Tan2Edge): After excuting [Remain],smooth the result vertices using [Tan2Edge]

Make Arc

1. AutoRadius:Calculate  the radius base on the selected  vertices and adjcent Edges 
2. Tan2Edge: Shape the vertices to an Arc , which is defined  by  the radius and 2 tangents defined by two  edges. In order priority,the two  edges can be  the selected edges, adjcent open edges,any two of the adjcent edges
3. 
   
4. Tan1Edge: Shape the vertices to an Arc , which is defined  by  the radius and 1tangent defined by one edge.In order of priority ,the edge can be a selected edge ,an open edge or any one edge . 
5. Corner:Collapes selected vertices to one vertex
6. 
   

ArcBy3P

1. Pick Height：Pick a point that specifies the top of the arc  to define an circle with two end vertices
2. Pick 3rd Point:Pick a point to define an arc with  two end vertices
3. ArcTo3p: Make an  arc through three points, two of them are  the positions of end vertices, the rest one is a point snapped.
4. if right-click the button,moving mouse will  change  the arc radius.