3D
Invisibility
Toolkit
The tools in this kit are designed for drawing dynamic
models of convex polyhedra whose faces, edges, and
vertices correctly change their appearance depending
on their visibility: edges become dashed and faces
and vertices vanish when they appear on the back
side of the solid as its shape is changed by dragging
vertices or by spinning the entire image. (Tools
like these were used to construct the author's icosahedron.)
Vladimir Dubrovsky, 2004
Fractal
Gallery
This sketch from Sketchpad's Samples illustrates
a potpourri of iterated geometric constructions,
many of them producing well-studied fractals.
Sketchpad Samples
A remarkable
model of a regular icosahedron, with an exercise
page describing a construction of this Platonic
solid. The shape can be spun, lit from different
angles, and viewed from any reference point. (Constructions
like this can be made with the author's 3D Invisibility
Toolkit.)
Rainbow
Investigation
This explanatory sketch from Sketchpad's Samples
collection looks at the physics of rainbows: light
traveling through prisms and water droplets.
Sketchpad Samples
Copyright by Dara Math , Chiangmai , Thailand . All rights reserved. Questions
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