Floating origin is a nice algorithm for dealing with floating point imprecision. Essentially just translating the camera to origin regularly. Regarding terrain

Floating origin is a nice algorithm for dealing with floating point imprecision. Essentially just translating the camera to origin regularly. Regarding terrain there are many techniques of varying difficulties to implement. Streaming terrain data and stitching LOD seams (both normal and vertex blending) are basically the gist of it, but the implementation details regarding uniform vs non-uniform grids, tesselation vs chunking etc. needs to be considered.