RTG Plus

Realistic Terrain Generation Plus is a branch of the original RTG that significantly expands the diversity of forest areas. Forests now differ in tree species composition, their height, and growth density. This modification complements the existing landscape diversity in RTG, including wide navigable rivers and lakes, majestic mountain ranges, gentle hills, and endless plains.
Enhanced Vegetation
RTG Plus adds numerous variations of main tree species - oak, spruce, birch, acacia, and dark oak, which are presented in a wide range of sizes. Large trees are generated using a fractal principle, ensuring the uniqueness of each specimen. Forest areas differ in composition, density, and height - from individual trees to complex mixed plantations, from open woodlands to dense canopies, and from low-growing thickets to majestic cathedral forests.
Usage
To start the game, create a new world with the "RTG" type. For maximum landscape diversity, it's recommended to use the current version of Geographicraft, however RTG+ works excellently with the standard map as well.
Fixes and Improvements
- Increased depth of scenic lakes
- Reduced river depth
- Elimination of excess stone at water edges
- Reduced tree sizes in Roofed Forest to prevent generation hangs
- Improved Mesa generation
- New Bryce Canyon design with improved appearance and traversability
- New method for growing RTG trees from groups of saplings
- Willows no longer generate with withering foliage
- Support for all BoP biomes (previously some were missing)
- Support for Thaumcraft biomes
- Increased size and impressive appearance of landmarks in savanna
Growing RTG Trees
Saplings without neighbors in orthogonal or diagonal directions grow into standard vanilla trees.
Saplings forming 2×2 patterns grow into special vanilla trees (jungle, spruce, and dark oak).
RTG trees grow from oak, birch, spruce, acacia, and dark oak saplings placed in groups within a 3×3 area with a sapling in the center.
For oak, birch, and spruce: the more saplings in the 3×3 area, the taller the tree. Two adjacent oak saplings grow approximately like this (size may vary):

Six oak saplings in a 2×3 area grow into:

(size and shape may vary for large trees)
Two adjacent birch saplings grow approximately like this:

Six birch saplings in a 3×3 array grow into:

Two adjacent spruce saplings:

Six spruce saplings in a 3×3 array grow into:

There is one special exception: a pattern of three oak saplings forming an obtuse angle:

Grows into an RTG Swamp Willow:

Two acacia saplings:

Due to the large size of vanilla acacias, the algorithm may sometimes create a standard acacia.
The largest acacias generated by RTG approximately correspond to the size produced by a group of 4 saplings:

Larger groups grow into even larger trees.
Two dark oak saplings together produce one of the RTG Roofed Forest trees:

Three saplings produce another:

A 2×2 pattern produces a vanilla dark oak, as mentioned above. Other sizes of dark oak sapling groups produce nothing.