// Effects:
  //   - Trails (billboard lines following objects)
  //   - Particles (quickly decaying point textures)
  //   - Clouds (volumetric nebulae)
  //   - Flares (lens flares known from photographing against the sun)
  //   - Fluid (metaballs)
  //   - Decals (projective texturing?)
  //   - Clothing (soft folding tissue)
  // Terrain:
  //   - ROAM 2.0 (arbitrary landscape rendering; TINs)
  //   - Vegetation (small scale plants on the ground)
  //   - Forests (large scale plants with impostors)
  //   - Water (liquid surface)
  //   - Lightning (electrical current attracted the reference points)

  // Blood:
  // Particles hit surface, transform to Metaballs 
  // Metaballs glide down surface, transform to decals