Building Plant Models

This page shows a GeometryBasics-first workflow: reference meshes are GeometryBasics.Mesh and node transformations use CoordinateTransformations.

Overview

The recommended workflow is:

Define one RefMesh per organ type using GeometryBasics.Mesh.
Build your MTG topology.
Attach Geometry to each node with a CoordinateTransformations.Transformation.

Create Reference Meshes

refmesh_cylinder

RefMesh{String, GeometryBasics.Mesh{3, Float32, GeometryBasics.NgonFace{3, GeometryBasics.OffsetInteger{-1, UInt32}}, (:position,), Tuple{Vector{Point{3, Float32}}}, Vector{GeometryBasics.NgonFace{3, GeometryBasics.OffsetInteger{-1, UInt32}}}}, ColorTypes.RGB{Float64}, Vector{Vec{3, Float64}}, Nothing}("Cylinder", Mesh{3, Float32, GeometryBasics.NgonFace{3, GeometryBasics.OffsetInteger{-1, UInt32}}}(...), Vec{3, Float64}[[-0.2079117555624273, -0.9781475869718993, 0.0], [0.5877851979724341, -0.8090170338407632, 0.0], [0.866025368452769, -0.500000061196242, 0.0], [0.9945218964062968, -0.10452845339151909, 0.0], [0.951056490534413, 0.30901707365834336, -0.0], [0.7431448429718478, 0.6691305869292987, -0.0], [0.40673667947806075, 0.9135454414352694, -0.0], [0.0, 1.0, -0.0], [-0.40673667947806075, 0.9135454414352694, 0.0], [-0.7431448429718478, 0.6691305869292987, 0.0]  …  [0.0, -0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, 0.0, 1.0], [0.0, -0.0, -1.0], [0.0, 0.0, 1.0]], nothing, RGB{Float64}(0.5, 0.5, 0.5), false)

Build an MTG

mtg = build_mtg(4, 2)
add_geometry!(mtg, refmesh_cylinder, refmesh_leaf)
length(descendants(mtg, :geometry; ignore_nothing=true, self=true))

Visualize

plantviz(mtg, color=Dict("Cylinder" => :tan4, "Leaf" => :seagreen3))

Notes

Internal coordinates are unitless Float64 values in meters.
Transform composition is done with compose_lr(t1, t2) (left-to-right semantics).
Use LinearMap, Translation, and AffineMap from CoordinateTransformations.