particle_render — GFX2D `particle` op

• Data kinds: table → rgba

• Call: import gfx2d; gfx2d.particle_render(state, height, width, mode='add', fade=True) (or opsgfx2d.get("particle_render"))

Usage

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.

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

Ops the type connects to (they accept `rgba` as input)

premultiply · alpha_composite · sprite_blit · sprite_transform · sprite_sheet_slice · nine_slice

Same category (`particle`)

particle_emit · particle_step

*Provenance: gfx2d.py — GFX2D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

particle_render — GFX2D particle op