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>
32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
---
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id: light-height
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name: Light.height
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category: light
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kind: namespace-method
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tokens: Light.height
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sig: Light.height(height)
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tip: Set the virtual height of lights above the surface, for normal-map shading.
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order: 12
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ns: Light
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member: height
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---
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Sets how far above the surface plane lights sit, in pixels — the <code>z</code> distance used when shading <a href="light-normal"><code>normal-mapped</code></a> surfaces. A low height makes light rays graze the surface, so tilted faces contrast sharply; a high height lights everything more head-on. It only affects the <code>N·L</code> term, so a scene with no stamped normals is unchanged. The default (<code>64</code>) suits most scenes. Persists until changed.
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Parameters:
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- `height` — the light's height above the plane in pixels (`> 0`)
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```ludic
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program Demo {
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property Wall { x: int = 0, y: int = 0 }
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model Block { Wall }
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handler Render phase Update {
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Screen.clear(0)
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Light.clear_normals()
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Light.height(24) # low, grazing light
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Light.normal(60, 50, 16, 24, 0.7, 0.0)
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Light.point(120, 62, 90, Color.rgb(255, 240, 200), 1.0)
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Screen.show()
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}
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}
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```
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