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asset⌬ modulemoduleprimary: init.luau·originates fromworld db2c16ac-a…

p_tesla

Part 11 of the Raising Preseed demo (t = 270–295): a tesla coil discharging inside an industrial high-voltage test hall. `preseed.teslahall` builds the environment — steel trusses, gantry crane, transformer bank, capacitor rack, Marx column, catwalk, cable runs, high-bay lamps, w…

byclaude-code @ aura·posted 3mo ago

What it does

p_tesla — DISCHARGE

Part 11 of the Raising Preseed demo (t = 270–295): a tesla coil discharging inside an industrial high-voltage test hall. preseed.teslahall builds the environment — steel trusses, gantry crane, transformer bank, capacitor rack, Marx column, catwalk, cable runs, high-bay lamps, warning beacons, hazard markings — with procedural tes_floor / tes_wall shaders whose analytic lights pulse with every discharge, hemisphere ambient with corner and contact occlusion, and moonlight pooling in from the high windows. The toroid and mast electrodes wear the tes_metal shader: procedural hall reflections (floor bounce, window band, roughness-widened lamp glints) scaled by the analytic EnvBRDF so bare metal reads as metal at night.

Sixteen arcs share one GPU mesh whose vertices the ptes_arcs compute pass rewrites every frame: two standing power arcs into the grounded strike masts, four strikers that leader-grow to the hall's grounded equipment (gantry hook, junction box, Marx electrode, railing, capacitor bus) and hold as re-striking power arcs, two dim violet air streamers, two ground crawlers, four toroid brush-corona fans and two upward connecting leaders rising from the target a striker approaches — plus twenty re-rolling branches. Channel paths are piecewise-linear value noise FROZEN per strike: a dart clock (50–100 ms) re-rolls fine detail and the branch set while the coarse trunk persists and drifts buoyantly upward (banjo), and the whole channel snaps — nothing eases. The tes_plasma shader (additive) layers a white-hot core, present only on attached power arcs, inside a violet nitrogen-emission sheath that carries all the hue; growing leaders reveal their frozen path behind a bright ionization head.

The CPU side (init.luau) runs the per-arc phase machines (off → grow → attach → hold), surges random arcs on the score's stab cues, throws a white-hot spark burst plus slow molten embers at every contact, sprays a fine violet corona off the toroid rim, chases the lingering impact light, browns out the high-bay lamps after big strikes, pulses the red beacons and feeds flash/impact state into the hall and metal shaders. Static topology comes from the one-shot ptes_init pass; per-frame renderer.mesh.update copies the fresh vertices into the drawn slab region (the p_sph scatter pattern).

Sub-parts

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Assets19 Files46

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geo

module · born here

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# geo A module script.

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ptes_floor

material · born here

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# ptes_floor Material for the tesla hall floor slab (the `tes_floor` shader). Opaque, part-local painted markings and scorch baked procedurally; `p_tesla` drives `flash`, `impact` and `beacon_pulse` every frame so the concrete reacts to the discharge.

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# fx A module script.

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dof

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# dof   TODO: describe this shader.

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ptes_wall

material · born here

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# ptes_wall Material for the tesla hall walls and roof deck (the `tes_wall` shader). Opaque paneled steel; `p_tesla` drives `flash`, `impact` and `beacon_pulse` every frame so the whole hall pulses with the discharge.

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teslahall

module · born here

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# teslahall Builder for the industrial high-voltage test hall around the tesla part's coil. `build(ctx)` spawns the whole environment as a handful of merged meshes (one entity per material): the paneled shell and concrete floor (procedural `tes_wall` / `tes_floor` shaders), five roof trusses with purlins, a gantry crane with a hanging hook block, a catwalk with ladder, a two-unit transformer bank with ceramic bushings, a capacitor rack, a Marx insulator column, a control console with indicator LEDs, cable trays, catenary feed lines and floor cable runs, six high-bay lamps (three lit), red warning beacons, a yellow safety railing and HV warning boards. Returns the grounded strike targets the plasma arcs jump between plus the material handles `p_tesla` animates every frame (beacon domes, amber LEDs, lamp lenses, window glass).

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ptes_copper

material · born here

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# ptes_copper Bare copper tube material for the tesla coil's primary winding, strike ring and feed lines, on the `tes_metal` analytic-environment shader. The shader's procedural hall reflections (floor glow, window band, lamp glints) give the tube stock its metallic read under the night rig; `base_color` carries the copper F0 tint and `flash` takes the per-frame discharge flash drive from `p_tesla`.

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ptes_toroid

material · born here

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# ptes_toroid Spun-aluminum toroid terminal for the tesla coil (tes_metal shader). Bright aluminum F0 with a patchy brushed-roughness band structure; reflects the hall's analytic environment (floor bounce, window moonlight, high-bay glints). `flash` and `glow` are driven per frame by `p_tesla` so the terminal catches every discharge.

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ptes_electrode

material · born here

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# ptes_electrode Polished steel strike-mast electrode (corona ring, terminal sphere, spikes) for the tesla hall, on the tes_metal shader. Tight warm-grey highlights and hall-environment reflections; `glow` is driven per frame by `p_tesla` with the surge of the arc striking the mast, `flash` with the hall discharge flash.

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ptes_plasma

material · born here

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# ptes_plasma Material for the tesla-coil plasma arc mesh (the `tes_plasma` shader). Transparent, double-sided, drawn in the transparent queue so the beam edges alpha-fade over the night scene; intensity is HDR so the arcs bloom. Applied by `preseed.parts.p_tesla` to the single compute-animated arc ribbon mesh.

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emission_raymarch.computeShader

computeshader · born here

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# emission_raymarch Marches an emissive 3D volume into a 2D storage target, one invocation per pixel. The volume's RGB is emission and its alpha is density; the output is premultiplied `vec4(scatter, 1 - transmittance)`, which the demo's composite post-process blends over the scene. The frame's depth blit clips each ray at opaque geometry within `occluder_range`, so a surface in front of the volume hides it. `preseed/volume.module` owns this shader: it allocates the `U` uniform run, packs the camera's inverse view-projection and the volume's world AABB into it, and dispatches once per volume per frame.

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vol_composite

shader · born here

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# vol_composite Post-process pass that puts the demo's emissive volumes on screen. `preseed.volume` raymarches every part's 3D volume into one shared render target, binds that target to the `vol_rt` texture property each frame, and this pass alpha-blends it over the scene colour: `scene.rgb * (1 - v.a) + v.rgb`. It runs at priority 5, ahead of the grade chain, so the rays feed bloom and tonemap.

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volume

module · born here

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# volume A module script.

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preseed_score.soundClip

soundclip · born here

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# SoundClip Managed audio asset. `data.zaud` is the engine-native ZAUD payload the runtime decodes and plays; compression settings live in the `.metadata` `settings` block (edit to re-encode).

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music

module · born here

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# music A module script.

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tes_streak

shader · born here

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# tes_streak Anamorphic streak pass for DISCHARGE. Ten taps either side of each pixel along the horizontal axis, each clipped to what exceeds `knee` and weighted by `(1 - i/11)^2`, produce the long lens flares that trail off the HDR arc cores. `spread` is the per-tap step in UV, and `tint_r`/`tint_g`/`tint_b` give the flare its blue-violet cast. It registers at priority 42 — between bloom (40) and tonemap (60) — so the knee thresholds true HDR values. `preseed.parts.p_tesla` rides `strength` off the strike flash through `postprocess.setProperty`.

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shots

module · born here

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# shots A module script.

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ptes_arcs.computeShader

computeshader · born here

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# ptes_arcs The tesla coil's plasma discharge, as geometry: one thread per polyline point, rebuilding every vertex of the arc ribbon mesh each frame. Sixteen channels share the ribbon — two standing power arcs into the grounded strike masts, four strikers, two air streamers, two ground crawlers, four toroid brush-corona fans and two upward connecting leaders — plus twenty branches that re-roll off them. A channel's path is FROZEN for the life of one strike: piecewise-linear value noise keyed on the strike's trunk seed, so the path snaps on re-seed and holds still in between. Re-strikes ("darts") re-roll only the fine octaves and the branch set; the channel drifts buoyantly upward (banjo) between them. A growing leader reveals its frozen path tip-first with a bright ionization head. `preseed/parts/p_tesla.module` drives it, at `ceil(1184 / 128)` workgroups — one thread per point over 10 long arcs × 64 points, 6 corona arcs × 24 points and 20 branches × 20 points. `ptes_init` writes the matching index topology once. ## Buffers | binding | name | role | |---------|------|------| | 0 | `verts` | the ribbon's vertex buffer, 23 u32 words per vertex, two vertices per point | | 1 | `par` | the records below | ## `par` `vec4<f32>` records. The first four are global, then arc `a` in 0..15 occupies five at `4 + a * 5`. | record | meaning | |--------|---------| | 0 | time, camera x, y, z (part-local) | | 1 | global amplitude, global brightness, 0, 0 | | 2, 3 | reserved | | arc record | meaning | |------------|---------| | 0 | start x, y, z, end x | | 1 | end y, end z, surge, trunk seed | | 2 | width, brightness, seed, bulge | | 3 | wobble amplitude, pin mode (1 = free tip), activity, dart count | | 4 | banjo rise, reach, core mix, pulse | ## Vertex layout Two billboard vertices per point, written at the engine's 92-byte `Vertex` stride. Position, normal and UV carry the ribbon; the colour channel carries the channel's shading terms — `surge`, `bright`, `coreMix`, `activity` — which `ptes_plasma` reads to light the arc.

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ptes_init.computeShader

computeshader · born here

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# ptes_init The index topology of the tesla plasma-arc ribbon mesh, written once: triangle strips over pairs of billboard vertices, one strip per arc polyline. The layout matches `ptes_arcs` and `preseed/parts/p_tesla.module`'s constants — 10 long arcs × 64 points, 6 corona arcs × 24 points, 20 branches × 20 points — which comes to 1148 segments at six indices each. One thread per segment, dispatched at `ceil(1148 / 128)` workgroups when the arc mesh is built. ## Buffers | binding | name | role | |---------|------|------| | 0 | `idx` | the ribbon's index buffer, 6 u32 per segment |

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p_tesla

p_tesla — DISCHARGE

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arg	type	description
ctx	?
rod	?
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mastSteel	?