Grid Guides for Blender
Add thirds, center line + root-2 rectangles, and diamond grid to camera view. This add-on comes with customizable features such as: changing grid color and line thickness.
These grids are tools I personally use when working on composition in painting software, thanks to Tiffanie Mang for introducing me to this grid combo. So, I tried implementing this in Blender.
For those curious about how these grids are applied in practice, you can check out how Tiffanie and Zac Retz analyze classical paintings using this grid combo here!
Special thanks to Tiffanie for inspiring me to make this add-on as well as Jay Hambidge's for his theory of dynamic symmetry. Please check them out, they're wonderful artists!
Also shout-out to Fabian for testing the early stage of the add-on!
Grid Guides 1.1 add-on (.zip)