fullseye

particle_render — GFX2D particle op

• データ種: table → rgba
• 呼び出し: import fullseye as fs; fs.ledger.particle_render(state, height, width, mode='add', fade=True) (実装を直接呼ぶなら import gfx2d; gfx2d.particle_render(state, height, width, mode='add', fade=True)、台帳から引くなら opsgfx2d.get("particle_render"))

使い方

Splat a particle state into an rgba image.

Each particle is a radially symmetric (1 - (r/R)^2)^2 kernel of radius size, weighted by its alpha and, when fade is set, by the remaining fraction of its life (1 - age/life). Particles past their lifetime contribute nothing.

mode is "add" (premultiplied additive — what a spark does; the result is clipped at 1 and the clipped energy is not returned) or "over" (each particle composited in array order, which is what a soft smoke puff does).

Pure function of the state: no randomness enters here, so two calls on the same state produce identical bytes.

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

型が繋がる次の op(rgba を入力に取れる)

premultiply · alpha_composite · sprite_blit · sprite_transform · sprite_sheet_slice · nine_slice

同カテゴリ(particle)

particle_emit · particle_step

---

Provenance: gfx2d.py — GFX2D operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.

This site is open source. Improve this page.