This page is a link to https://knot-toy.wood.properties/ – a web app for teaching and learning about knots and visual grading of timber. There is no user guide at the moment, but the idea is to make boards in the build mode and try to assess them like a visual grader in the grader sim mode. The render mode is for making things look nice.

With advanced render mode, you can make reasonably realistic wood textures for 3D models. Here is an example with the Benchy boat https://skfb.ly/pMPsn and another with the Stanford bunny https://skfb.ly/pMPyL. Wane can be added to the exported model, e.g. https://skfb.ly/pMQVV

16 August 2026 V1.0 First public release
16 August 2026 V1.1 Fixed a UI glitch that affected smaller screens
17 August 2026 V1.2 Extended the undo-redo to all modes and made some other small improvements.
18 August 2026 V1.3 Made the advanced render work better for complex 3D geometry
19 August 2026 V1.4 Added wane to the advanced render mode
23 August 2026 V1.5 Added a 3D photo mode to the advanced render