Spline

spline-3d-interactivity

The built-in Events & Actions machinery — for EDITING interactivity a scene already has, for features only events provide (Scroll/Collision/Trigger/DragDrop/LookAt/Follow, variables + property bindings), for sensor events bridging clicks/hovers into code, and for explicit user asks. NEW interactive behavior is code-driven by default (the `animation` skill + the spline bridge). Covers event/action types, creating and editing them (updateEvent/updateAction/updateTween/remove*), states, variables (basic + dynamic), and inspecting existing interactivity via get_objects.

spline-3d-lathe

The Lathe primitive: revolving a 4-point bezier profile around Y into vases, bottles, bowls, cups, glasses, lamp bases, chess pieces, columns, domes. The points contract (x = radius, y-down, top-first), sizing behavior, segments, open rims & double-siding, profile recipes, and multi-lathe / customMesh fallbacks for complex silhouettes. Load for prompts like "vase", "bottle", "bowl", "cup", "pot", "goblet", "lathe".

spline-3d-materials-and-look

Material layer stacks (color, shading/light category, gradient, fresnel, glass/transmission, depth, texture, displace terrain relief), decal stickers/splashes/impact marks stamped onto surfaces, flatShading/side, animated material tweens, layer/addLayer/updateLayer/removeLayer, opacity, lighting for good looks, fog/AO atmosphere, and backgrounds.

spline-3d-organic-scenes

Nature & organic scenes, stylized or believable: terrain and islands (displace layer vs customMesh), trees/rocks, water, clouds, graded skies, surface scatter, atmosphere, palettes, and ambient motion. Load for prompts like "floating island", "forest", "landscape", "ocean". (Planets/space have their own 'planets' skill.)

spline-3d-particles

Particle emitters: creating and tuning them with particles() (emission, motion, sprite look, emitter shapes, timing), recipes (snow, rain, fire, smoke, confetti, auras), and runtime control via the Particles action (start/stop/burst on events). Load for prompts like "particles", "snow", "rain", "fire", "sparks", "smoke", "confetti", "fireworks", "magic dust".

spline-3d-physics

The physics simulation itself (no character needed): page Simulation switch + gravity, physics() in depth (positioned colliders vs dynamic bodies, friction/bounce/density/gravityScale/damping, convex vs trimesh colliders, fused vs separate group bodies, axis locks), kinematic movers (animated/dragged colliders that push dynamic bodies), spawning dynamic objects with the Create action, and falling/stacking/bouncing/floating recipes.

spline-3d-planets

Planet & space scenes: realistic textured planets (AI texture layer — take the initiative), stylized procedural planets, atmosphere rims, rings, moons, space lighting and backdrop. Load for prompts like "planet", "earth", "mars", "moon", "solar system", "space scene".

spline-3d-procedural-generation

Procedural terrain/ocean/tree/rock/globe/building generators, seeded surface scatter, the constraint-based layout() solver, and the miniworld/diorama, city-street, enclosed-terrain (canyon/cave) and creature-rig recipes. Load for prompts like "forest", "island", "landscape", "ocean", "canyon", "cave", "city", "miniworld", "mini world", "diorama", "arrange the furniture", "place these neatly", or any scene needing many natural assets or exact relative placement.

spline-3d-scene-optimization

Scene performance optimization: reading analyze_scene reports, reducing polygons, decimate(), merge(), bakeBoolean(), consolidating materials, taming lights/shadows/effects/textures, removing unused content — the measure→fix→verify workflow and visual-parity rules. Load for "optimize my scene", "reduce the file size", "make it run faster", "improve FPS", "slow/laggy", "too many polygons", and every fix requested from the Performance panel.

spline-3d-shape-blends

Shape Blends (metaballs / SDF blending): melting meshes into ONE smooth organic surface with shapeBlend() — goo, blobs, liquid drops merging, lava lamps, slime, snowmen, clouds, soft cartoon bodies. Creating from member shapes, per-shape union/subtract/intersect, blend range tuning, the resolution budget, children-color gradients, and animating members so the goo morphs. Load for prompts like 'blob', 'goo', 'gooey', 'metaball', 'melt together', 'merge smoothly', 'liquid', 'slime', 'lava lamp', 'organic blend', 'shape blend'.

spline-3d-state-transitions

The built-in States & Transitions animation feature — load ONLY when the user explicitly asks for it (names states, transitions, the timeline, or the States panel), or for physics-coupled kinematic motion (moving platforms — the one motion that must be state-driven): the all-in-one animate() helper plus the low-level addState/addEvent/addAction/updateTween flow, easings, duration, delay, loop and pingpong. Code-driven motion (the default) is the `animation` skill.

spline-3d-texture-drawing

The generateTexture contract and recipes: draw seamless repeating textures locally with canvas 2D (brick/stone walls, wood planks, roof tiles, ceramic/checker floors, pavement) — the seam-wrap rules (rng-only randomness, save/restore transforms, opaque base, one draw per feature), sizing/repeat math, and worked per-material drawing recipes. Load BEFORE writing any generateTexture call.

spline-3d-use

**MANDATORY prerequisite** — you MUST invoke this skill BEFORE every `3d_run_code` tool call. NEVER call `3d_run_code` directly without loading this skill first. Skipping it causes common, hard-to-debug failures. Trigger whenever the user wants to create, edit, animate or inspect anything in a Spline 3D scene — objects, shapes, 3D text, materials, lights, cameras, the environment, animation, interactivity or physics.