@motion-script/core / ParametricGeometry3D

Interface: ParametricGeometry3D

Defined in: render3d/geometry.ts:234

A surface sampled over a [0,1] × [0,1] grid — the ergonomic form of BufferGeometry3D for procedural meshes (waves, terrain, ribbons).

Core evaluates the callbacks into vertex buffers at record time, so the descriptor handed to the renderer is still plain data. Re-evaluated every frame, so read signals and the frame time inside vertex.

Geo.parametric({ segments: [70, 70], vertex: (u, v) => ({ x: (u - 0.5) * 20, y: wave(u, v, t), z: (v - 0.5) * 20 }), computeNormals: true, })

Extends

Passthrough3D

Properties

color?

optional color?: (u, v, position) => Color

Defined in: render3d/geometry.ts:241

Optional per-vertex colour. Needs vertexColors: true on the material.

Parameters

u

number

v

number

position

Vector3

Returns

Color

computeNormals?

optional computeNormals?: boolean

Defined in: render3d/geometry.ts:243

Derive vertex normals. Almost always wanted for a lit surface.

params?

optional params?: Record<string, unknown>

Defined in: render3d/geometry.ts:14

Inherited from

Passthrough3D.params

segments

segments: number | readonly [number, number]

Defined in: render3d/geometry.ts:237

Grid resolution as [uSegments, vSegments], or one number for both.

type

type: "parametric"

Defined in: render3d/geometry.ts:235

vertex

vertex: (u, v) => ParametricVertex3D

Defined in: render3d/geometry.ts:239

Position for grid coordinate (u, v), both in [0, 1].

Parameters

u

number

v

number

Returns

ParametricVertex3D