Tree and prop variants

Use several compatible prefab rules to vary a biome’s trees and decorations. Assign the target surface and adjust each rule’s chance or weight. Use random yaw where it suits the model.

Changing a rule’s probability changes its presence; it does not resize the model. Keep variants consistently sized and correctly authored at scale 1.

Inspect the result with the same seed while adjusting a rule. The final amount also depends on free space, paths and terrain. See decoration rules.