# ATMNE18 Hotel Lighting: More GeoGebra Augmented Reality Demos

- Author:
- Tim Brzezinski

These 2 screencasts were taken inside the Crowne Plaza Hotel. This was the site of the 2018 Association of Mathematics Teachers of New England (ATMNE18) conference (Dec 6 - 7, 2018 in Warwick, Rhode Island, USA).
Note, .
Since the distance between any point ( , the intersection of the

**for the first screencast**, the**blue surface**has equation*x*,*y*) in the coordinate plane (i.e. the plane z = 0) and the origin =**blue surface**and any plane that contains the z-axis will be a cosine wave. (This is why it looks like a cosine wave in all directions!) For the**second screencast**and**third screencast**, how would you describe the 2 surfaces are used to model these light fixtures? How can we tell? For the**third screencast**, how do the equations ensure these 2 surfaces don't overlap or leave any gaps (despite one that may seem to appear)?