This project is rather inactive, might I suggest you look at https://trenchbroom.github.io/

RunegearX

Migrating the project to .net Core for a 1.0 release.

• Refactor code
• Add missing basic features
  • CSG carve, slice, hollow
  • Undo/redo of commands
  • Visibility groups (layers)
  • Basic entities
  • Ability to add properties to brushes and entities

Goal

The goal is to 'finish' this project and create a basic oldschool CSG editor with an engine agnostic file format.

Core editor features

• Saving/loading file format
• Undo/redo functionality
• Copy, cut, paste brushes/entities
• Texture browser/manager
• Basic configurability through settings
  • colors, etc...

Core features

• Drawing brush primitives
  • Rectangle, Cylinder, Wedge, Cone
• Manipulating brush primitives (brushes, faces, vertices)
  • Move, Rotate, Scale, Skew
• Texturing brushes
  • Shift, scale, rotate
  • Justify (fit, center, top, left, right, bottom)
  • Lock texture
• Grouping brushes & entities
  • Logical grouping
  • Visibility grouping
• Constructive solid geometry
  • Carve
  • Slice
  • Hollow
  • Extrude
• Place and manipulate entities (basically points with properties)
  • Predefined entities
    • Lights
  • Custom defined entities