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Canvas 2D vs WebGL for interactive globes

Canvas 2D and WebGL both draw into a browser canvas. The difference is the rendering model and the type of product each supports well.

Canvas 2D is usually appropriate when​

  • the result is a focused globe or world-map component;
  • markers, arcs, labels, country fills, and 2D overlays are enough;
  • the same drawing must export cleanly as an image;
  • a WebGL context is unavailable or undesirable;
  • a small dependency surface matters;
  • keyboard and reduced-motion behavior should be controlled at the component level.

WebGL is usually appropriate when​

  • you need perspective cameras, lighting, shaders, textures, or real 3D models;
  • thousands of independently animated objects must be moved by the GPU;
  • depth testing and spatial composition are product requirements;
  • the project already depends on Three.js or another WebGL engine.

Important distinction​

A globe can look three-dimensional on a two-dimensional canvas without using a 3D scene engine. Orthographic projection, horizon clipping, shading, and lifted great-circle arcs create depth cues. CanvasGlobe uses this approach.

That does not make Canvas 2D a replacement for a general WebGL renderer. CanvasGlobe does not provide perspective cameras, meshes, custom shaders, terrain, or 3D Tiles.

How to decide​

  1. List the required layers and interactions.
  2. Test the largest realistic dataset.
  3. Measure the complete application, not only the library package.
  4. Test target mobile devices and reduced motion.
  5. Verify image or video export if it is required.
  6. Prefer the simpler renderer that satisfies the real requirements.

Try the Canvas 2D playground or compare CanvasGlobe, Cobe, globe.gl, MapLibre, and Cesium.