TreeLod

from acron.proctree import TreeLod

class TreeLod

Bases:

Bases: TypedReferenceCount

Levels of detail from one skeleton, each under a triangle budget.

A level is the cheapest of a fixed ladder of reductions that fits its budget, and always coarser than the level before: fewer rings along a stem (`ring_stride`), fewer sides (`radial_scale`), thin wood pruned on a copy (`min_radius`; the leaves of a pruned twig move to the branch it grew from) and fewer leaf cards (`leaf_keep`, the outer cards first, the rest scaled up so the crown keeps its area). A level added with `cards > 0` is a billboard cloud instead: the leaves clustered (k-means) into that many big crossed cards over the trunk and the thickest limbs.

Inheritance diagram

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__init__()

add_level()

A level under `triangle_budget`; `cards > 0` makes it a billboard cloud of that many cards.

static billboard_cloud()

The leaves clustered into `cards` big crossed cards (deterministic k-means: farthest-point seeds from the top, six rounds), over the wood thicker than `min_radius`.

build()

Builds every level from the skeleton (each the first step of the ladder, past the previous level’s, that meets its budget).

clear_levels()

get_budget()

static get_class_type()

get_geom()

get_leaf_keep()

get_min_radius()

get_num_levels()

get_radial_scale()

get_ring_stride()

get_skeleton()

The (reduced) skeleton the level was meshed from.

get_triangles()

static reduce()

A copy without the wood thinner than `min_radius` (or deeper than `max_level`) and with `leaf_keep` of the leaves – the outer ones first, in a nested order (a smaller keep is a subset of a larger), scaled up so the crown keeps its leaf area. Leaves of pruned twigs move to the branch the twig grew from.