Blender 3D : FaceBuilder from keentools.

This keentools webpage providde many tools for users.

One of these is the FaceBuilder tool for Blender 3D software.

FaceBuilder​ is an add-on for Blender for 3D-modelling of human faces and heads based on photos. With FaceBuilder you don’t need to be an experienced 3D modeler to create a quality 3D model with clean topology. You start with getting a few photos of a person from different angles of view and then place a model on each of them to build a head or a face model. The 3D models can be later used for sculpting, animation, tracking or anything else in Blender or exported into a file and imported into any other 3D software.

Let's see the install step from the official youtube channel:

... and these videos with this tool:

Shadertoy: iChannel texture - 005.

This simple example is a kaleidoscope distorsion with math functions: sine and cosine.

You can see this book name it A Mathematical Kaleidoscope: Applications in Industry, Business and Science by B Conolly, S. Vajda how math can solve many issues.

You can change the parameters to see how they interact and how the distortions and use the mouse.

Shadertoy: iChannel texture - 004.

Here is a simple example that can help us understand a bit about the theory of spatial frequency.

This theory is used in various fields as wave propagation.

The example is very simple for a better understanding.

You can change the parameters to see how they interact and how the distortions are.