# Math 21a Fall 2019

## Multivariable Calculus

# Yoga Cat

To illustrate data in computer vision, a yoga cat was scanned with the phone. Once the**spacial data**are acquired, one can now do various things with it, like displaying the curvature or painting in gold. Curvature is very interesting. It is seen in the picture to the right of the photograph. Places where the surface looks like a saddle (negative curvature), the surface is colored red, where the surface looks like a paraboloid (positive curvature), the surface is colored blue. We will later see this curvature in the form of the discriminant D when extremizing functions.