Mip-NeRF A Multiscale Representation for Anti-Aliasing Neural Radiance Fields

point sampling in NeRF leads to aliasing

• scpecially for scenes where caneras are from different distances
• integrate posenc in a cone instead of sample form a point
• single MLP, no coarse and fine network, but still have coarse and fine points: not needed, scale modeled in IPE
  • update weight before sample fine points, leap-frog