Test examples
○ Colorful spheres
△ Coplanar polygon
□ Cube with directional light
□ Cuboids
⁄ Dashed line
☆ Empty scene
⁄ Line
☆ Multiple cones
☆ Multiple cylinders
● Points
△ Polygon with custom vertexNormals
△ Polygons
➚ Purple arrow
☆ Scene with numbered axes
○ Sphere with ambient light
○ Sphere with point light
○ Sphere with spot light
☆ Texts
☆ Tubes
⬠ Uniform-polyhedrons
☆ Wrong protocol version warning