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# Introduction

Platonic solids are polyhedron which satisfy 3 conditions

1. all its faces are congruent convex regular polygons,
2. none of its faces intersect except at their edges, and
3. the same number of faces meet at each of its vertices

## Hexahedron

The most commonly recognised platonic solid, also known as a cube.

## Walking man pacing a sqaure

This is a test of animating an inline animation. In my previous walking man blog, I published an x3d file named walkman.x3d. In this blog, I tried to use the inline command to firstly insert the walkman.x3d as a single object (obj_0), then applied animation again onto this object.

The result is very succeesful.

## Walking man

This is another test of animation in VRMath2. The construction of the man utilises basic 3D primitives including sphere, cone, sylinder, and cube. It is basically a trial and error approach to scale and apply material settings onto those 3D primitive objects.

Animation is then applied to the arms and legs by careful considerations about their positions and orientations of movements.

## Rotating Earth orbiting the Sun

This is a simple Earth and Sun model. This model is not to scale in terms of size and distance.

The rotation and revolution speeds are roughly to scale. The Earth in this model is rotating at 1 second per rotation. It is also revolving at 365 seconds per revolution.

The Earth has a tile of 23.5 degrees on its rotation axis to the orbiting plane. There are also some background stars (points). This model can be easily created using VRMath2 Editor