Orkuncakilkaya
382826889f
The remaining lighting tiers from the original proposal, all extending the deterministic accumulation core (light.ludic) — no new ECS plumbing: - Light.spot: cone / flashlight lights (direction + spread degrees), with a self-contained integer atan2-in-degrees and a feathered edge. - Light.falloff: a brightness-ramp exponent (1 linear, 2 quadratic, …) via repeated fixed multiply. - Light.soft: soft shadows — an area-sampled light so an occluder edge fades through a penumbra instead of a hard cut. - Light.gel + Light.clear_gel: colour cookies — a light gels from its centre colour to a rim colour. - Light.normal + Light.clear_normals + Light.height: a normal G-buffer so surfaces shade by facing (N·L), not distance alone (tier 3). - Light.time_of_day: a day/night ambient ramp from a single 0..1 value. The engine lighting system (systems_light.ludic) consumes matching optional Light2D fields — direction/spread/falloff/softness/gel — each defaulting off so an older five-field Light2D lights exactly as before. Every tier is integer + Q16.16 fixed, so scenes light identically on every run and headless. Worked example + regression: examples/library/light_tiers.ludic (1 1 1 1 1 1 1 1 1). Nine new docs/language/light pages. Full suite 76 passed, self-host C-free fixpoint intact, no golden drift. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
---
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id: light-falloff
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name: Light.falloff
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category: light
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kind: namespace-method
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tokens: Light.falloff
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sig: Light.falloff(exponent)
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tip: Set the brightness-ramp exponent for later lights (1 linear, 2 quadratic…).
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order: 6
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ns: Light
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member: falloff
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---
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Sets the **falloff curve** applied to every light emitted after it. A light's brightness ramps from full at the centre to zero at its radius; the ramp is raised to <code>exponent</code>, so <code>1</code> is the original linear falloff, <code>2</code> is quadratic (a softer, more concentrated core), <code>3</code> cubic, and so on. Like the occluder store, the setting persists across frames until changed — a game sets it once, or per light, and it rides alongside the short <a href="light-point"><code>Light.point</code></a> / <a href="light-spot"><code>Light.spot</code></a> signatures. Integer exponent, Q16.16 ramp — deterministic.
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Parameters:
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- `exponent` — the ramp power, an integer `>= 1` (`1` = linear, the default)
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```ludic
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program Demo {
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property Torch { x: int = 0, y: int = 0 }
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model Lamp { Torch }
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handler Render phase Update {
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Screen.clear(0)
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Light.ambient(Color.rgb(24, 24, 32))
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Light.falloff(2) # a tighter, quadratic glow
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Light.point(80, 60, 70, Color.rgb(255, 210, 130), 1.0)
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Screen.show()
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}
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}
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```
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