v2.0.0

Complete rewrite in Rust. The command is now hmterrain.

Added

• Adaptive meshes (TIN) by greedy Delaunay insertion, the new default. Every
  pixel stays within --max-error of the mesh, and flat areas need far fewer
  triangles. --max-triangles and --max-vertices set a size budget instead.
• Output formats: binary glTF (.glb), binary STL (.stl) and binary PLY
  (.ply), next to OBJ.
• --base THICKNESS closes the terrain into a watertight solid for 3D printing.
• 16-bit and floating-point heightmaps, plus TIFF, JPEG, BMP, TGA and PNM input.
• Non-square heightmaps.
• Texture coordinates, so the source image or a satellite photo can be draped
  over the terrain.
• --pixel-size, --invert, --no-normalize, --no-center, --format,
  --threads and --quiet.
• A Rust library (heightmap_terrain) with the same features.
• CI on Linux, macOS and Windows, release binaries for seven targets with
  build provenance, CodeQL, OpenSSF Scorecard, cargo-deny and Dependabot.

Changed

• Heights are given with --min-height and --max-height. The v1 form
  hmterrain in.png out.obj -200 200 still works.
• Grid cells are split along the diagonal with the closer heights, so diagonal
  ridges and valleys stay sharp.
• The mesh is centered on X and Z only. The heights you ask for are the heights
  you get.
• Output is written to a temporary file first, so a failed run never leaves a
  truncated mesh.
• The output file is no longer opened in another program after conversion.

Fixed

• Height normalization divided by max - min + 1, so terrain used only part of
  the requested height range.
• Face indices in OBJ files were 0-based, which shifted every triangle by one
  vertex.
• Each grid cell was covered by four overlapping triangles with mixed winding,
  and a two-pixel border was missing.
• Normals were deduplicated as text and never referenced by faces, so viewers
  ignored them.
• Numbers used the system locale, which wrote commas as decimal separators on
  some systems and broke the OBJ file.
• Only the green channel was read, and 16-bit images lost precision.

Releases 1.0.1

Upgrade to .NET 8 and Refactor

Release 1.0.0

First Ever Release