Tree Parameters
Controls the shape of the tree by altering the first level branch length. Custom uses the envelope defined by the pruning parameters to control the tree shape directly rather than through pruning. There are 8 shape presets in addition to the Custom option:
- Conical
- Spherical
- Hemispherical
- Cylindrical
- Tapered Cylindrical
- Flame
- Inverse Conical
- Tend Flame
These are shown in the same order in the image below, with all other parameters kept constant.
Number of levels of branching, typically 3 or 4
Fractional amount by which the effect of pruning is applied
Width of the pruning envelope as a fraction of its height (the maximum height of the tree)
The fractional distance from the bottom of the pruning up at which the peak width occurs
The curvature of the lower section of the pruning envelope. < 1 results in a convex shape, > 1 in concave
The curvature of the upper section of the pruning envelope. < 1 results in a convex shape, > 1 in concave
Number of splits at base height on trunk, if negative then the number of splits will be randomly chosen up to a maximum of |base splits|
How much the radius at the base of the trunk increases
Scale of the entire tree
Maximum variation in size of the entire tree
Influence upon the growth direction of the tree in the x, y and z directions, the z element only applies to branches in the second level and above. Useful for simulating the effects of gravity, sunlight and wind. The image below shows the Silver Birch preset generated with 0 tropism in all directions, negative vertical tropism (gravity) and both vertical and lateral tropism (gravity + wind).
Ratio of the stem length to radius
How drastically the branch radius is reduced between branching levels