Calibrate your 3D viewport to follow the mouse for accuracy and changing resolutions. When calibrated, re-calibrations are only needed if changes are made to the UI or the resolution of the screen.
Get the ADDON - inletzone.com/geometry-builder
It's time to make map making easier than ever within Blender. Instead of looking to game engines to do the job, why not take full ownership of the mesh creation for a smoother and more customizable process?
Geometry Builder makes this a reality and more besides. It shines in scenarios such as game level design or architectural visualization. Nonetheless, it’s equally valuable for hard surface modelling, enabling users to add mesh with ease and accuracy.
#Blender is open source (GPL) and free to use for any purposes in regards to 3D creation like modeling, animation, rendering, compositing (VFX), motion tracking, 2D animation (Grease Pencil), rigging and texturing. Download it TODAY ► blender.org/download