ftt_treesize-class: S4 class for tree sizes: diameter, height, and crown...
In mikemahoney218/blender-forthetrees: See the Forest (Using 3D Renders in Blender)

Description Slots See Also

S4 class for tree sizes: diameter, height, and crown specifics.

dbh: Numeric: diameter at breast height, in meters. May include missing values, which will be handled differently by different rendering functions.
height: Numeric: bole height, in meters. May include missing values, which will be handled differently by different rendering functions. Height is understood as the total height of the object to be rendered (top of the stem and crown, if applicable); different importer functions may determine this differently.
crown: Logical: does the tree have leaves? May include missing values, which will be handled differently by different rendering functions.
crown_radius: Numeric: radius of the crown, in meters, at its widest point. May include missing values, which will be handled differently by different rendering functions.
idx: Character: a unique identifier (or "index") for each object to be modeled. Must be unique with no NA or NULL values, but otherwise is not validated.
x,y,z: Numeric: distance of the origin of the object from the origin of the grid system (the central point at 0, 0, 0) in meters in the given direction. Must have no NA, NULL, NaN, Inf, or -Inf values.
metadata: Data frame: a table containing additional information on the objects to be modeled. Optional, but if this slot is used then the data frame must contain a column named idx which should correspond to the idx slot. Only the existence of this column is validated.
appendix: List: additional data produced in the generation of the object. Not validated; any additional outputs that don't map to modeled objects may be inserted here.