Features and Limitations

Features and limitations

Webnim is a browser-native interactive TypeScript engine, not a Python Manim runtime or a video-rendering pipeline.

Manim feature coverage

Baseline: Manim Community v0.21.0 mobjects reference and animation reference, inspected 2026-09-09. This tracks declarative TypeScript equivalents, not Python compatibility. “Supported” means the documented JSON behavior works; it does not imply identical Manim rendering or every constructor argument.

Manim feature / family	Status	JSON equivalent or difference
NumberLine, UnitInterval	Supported	axis1d; native one-coordinate objects
Axes, NumberPlane	Supported	plane2d, axes/ticks/grid/camera/theme
PolarPlane	Supported	polar2d, radians, native polar tuples
ThreeDAxes	Supported	space3d, perspective/orthographic orbit camera
Dot, Dot3D	Supported	Point; opt-in parameter dragging
Line, Line3D, Arrow, Arrow3D	Supported	Line, Arrow; native coordinate dimension
Polygon, Polyline	Supported	Explicit vertices
RegularPolygon, Star	Supported	Sides/tips and radii
Rectangle, Square	Supported	Width/height/size
Circle, Ellipse, Arc, Sector	Supported	Sampled paths; no symbolic intersections
CubicBezier	Supported	Bezier, chained cubic control points
FunctionGraph	Supported	Optional domain, adaptive viewport sampling and discontinuity breaks
ParametricFunction	Supported	ParametricCurve, 1D/2D/polar/3D native expressions
Polar functions	Supported	PolarGraph
TangentLine, point from proportion	Partial	Typed Tangent/PointOnCurve, numerical sampled arc length
Group, VGroup	Partial	Qualified children, one parent, inherited transforms; local-origin group transforms
Text	Partial	Browser text with movement/fade/scale; rotation/deformation rejected
Tex, MathTex	Partial	KaTeX; movement/fade/scale only; no system LaTeX compiler
DecimalNumber, Integer, Variable	Partial	DecimalNumber bound to expression; choose decimal precision
Sphere, Cube, Prism	Supported	Sphere, Cube, Cuboid, triangle meshes
Cone, Cylinder, Torus	Supported	Triangle meshes, z-oriented
Surface	Supported	3 parsed expressions, u/v ranges and mesh resolution
Add	Supported	Instantaneous entrance
Create, Uncreate	Partial	Vector paths/path-only groups; no text/mesh clipping masquerading as writing
FadeIn, FadeOut	Supported	Persistent entrance/exit semantics
MoveToTarget / .animate.move_to	Supported	MoveTo, object center
.animate.shift, Rotate, Rotating, ScaleInPlace	Partial	Shift/Rotate/Scale; restricted label combinations
FadeToColor	Supported	Hex color interpolation
ApplyMatrix	Supported	Object matrix or whole-space ApplySpaceMatrix
ApplyComplexFunction	Partial	Whole 2D space, safe complex arithmetic and principal branches
MoveAlongPath	Supported	Path endpoint snapshot; normalized arc-length movement
Indicate, Wiggle	Supported	Temporary style/scale/rotation emphasis
GrowFromCenter	Supported	Centered entrance
Transform, ReplacementTransform	Partial	Vector-path resampling, deterministic repeated morphs; no surfaces/text/cross-space morphs
AnimationGroup, Succession, LaggedStart	Supported	Nested absolute-time compilation, duration scaling and conflicts
ValueTracker, ChangeDecimalToValue	Partial	Named parameters, AnimateParameter, numeric labels
Wait	Supported	Timeline gaps and explicit document duration
Scene changes	Supported	SwitchSpace, cut/fade, single clock, destination interaction
Free camera exploration	Supported	Independent per-space pan/zoom/orbit; no automatic selection
Animated camera, MovingCamera, ThreeDCamera choreography	Partial	CameraZoom, CameraWindow, CameraMove and CameraOrbit; no animated roll or projection switching
Coordinate slicing / partial derivative cross-sections	Planned	Declarative constraints/slicing planes; axis visibility is already configurable
BarChart, SampleSpace, probability diagrams	Partial	Signed bars and labeled probability partitions; no automatic axes or nested conditional diagrams
Table, MathTable, DecimalTable, MobjectTable	Excluded	Intentionally outside project scope
Matrix, DecimalMatrix, IntegerMatrix, MobjectMatrix	Partial	Fixed-cell matrix layout, KaTeX and dynamic numeric entries; MobjectMatrix remains planned
Graph, DiGraph, layout functions	Partial	Circle, line and explicit 2D layouts; static edges, no force layout or self loops
ArrowVectorField, StreamLines	Partial	Cartesian fields, bounded grids and RK4 streamlines; no component morphing
TracedPath	Supported	Deterministic historical point samples and optional trailing time window
AnimatedBoundary	Supported	Repeating stroke window and color cycling on a referenced continuous path
ImplicitFunction	Partial	Bounded 2D marching squares; disconnected contour components
ArcBetweenPoints	Supported	Signed circular sweep between endpoints
Annulus, AnnularSector, ArcPolygon	Supported	Hole-preserving annular paths and per-edge signed arc sweeps
DashedLine, DoubleArrow, CurvedArrow, CurvedDoubleArrow	Supported	World-space dashes and endpoint arrowheads in Canvas/Three.js
Angle, RightAngle	Supported	Ray-defined markers, live coordinate references, perpendicularity validation
Elbow, labeled geometry	Partial	Elbow supported; labels can be composed separately
RoundedRectangle, Triangle	Supported	Rounded corners and equilateral triangle
RegularPolygram, ConvexHull	Partial	Stroke-only polygrams, planar convex hull; no self-intersecting polygram fill
Union, Difference, Intersection, Exclusion	Supported	Bounded polygon clipping with disconnected components and hole triangulation; sampled curved boundaries
Brace, ArcBrace, surrounding/background rectangles	Partial	2D path/point bounds, Brace, SurroundingRectangle, BackgroundRectangle; no ArcBrace or measured text bounds
ComplexPlane, nonlinear/log scales	Partial	Complex transforms supported; alternate axis scale systems planned
ShowPassingFlash	Supported	Temporary moving arc-length stroke window; source hidden after completion
Flash, FocusOn, Circumscribe, ApplyWave, Blink	Partial	ApplyWave/Blink and temporary 2D Flash/FocusOn/Circumscribe overlays; no group or measured text outlines
GrowArrow, GrowFromEdge, GrowFromPoint, SpinInFromNothing	Partial	Anchored drawable-object growth and centered spin; new growth events exclude groups, and label restrictions apply
DrawBorderThenFill	Supported	Separate outline and fill phases; supports vector-path groups
ShowIncreasingSubsets, ShowSubmobjectsOneByOne	Supported	Ordered group children, including nested descendants
Write, Unwrite, AddTextLetterByLetter, word writing	Partial	Unicode grapheme reveal/removal and AddTextWordByWord; actual glyph stroke writing remains planned
TransformMatchingTex, TransformMatchingShapes	Planned	Matching/glyph correspondence
Homotopy, ComplexHomotopy, PhaseFlow	Partial	Safe Cartesian/complex homotopies and deterministic RK4 PhaseFlow on points/continuous paths; no mesh or label deformation
ApplyFunction, ApplyMethod, ApplyPointwiseFunction	Partial	ApplyPointwiseFunction uses safe Cartesian expressions; executable callbacks stay excluded
Restore, Swap, CyclicReplace, TransformFromCopy, FadeTransform	Partial	Snapshot Restore, sibling Swap/CyclicReplace, crossfade FadeTransform and continuous-path TransformFromCopy
ChangeSpeed, arbitrary rate functions	Partial	23 bounded built-in easing curves; custom time warps remain planned
LaggedStartMap	Supported	Declarative target-list expansion with one shared animation template
Polyhedron, Dodecahedron, Icosahedron, ConvexHull3D	Supported	Closed convex-face shells, Platonic meshes and bounded 64-point spatial hulls
Code, markup/paragraph/title/bulleted text, Typst	Planned	Structured text/layout adapters
ImageMobject and image sequences	Partial	Preloaded 2D ImageMobject/ImageSequence, affine transforms and deterministic frames; no 3D textured images
SVG import, SVGMobject, VMobjectFromSVGPath	Excluded	Explicitly outside project scope
Executable Python/JavaScript callbacks, arbitrary updaters	Excluded	No executable code in scene JSON; typed dependencies/expressions replace callback use cases
Manim Python script compatibility, Python CLI, video pipeline	Excluded	Browser-native interactive TypeScript engine
Picture-in-picture multi-view composition (engine extension)	Supported	PiP objects with Add/FadeIn/FadeOut, absolute-pixel insets, shared clock and independent cameras

Rendering differences

All geometry is evaluated headlessly into Cartesian 3D triples. Canvas and Three.js are rendering adapters over that common representation, and the player composites space fades. Mesh normals are recomputed by the 3D adapter; math labels are DOM/KaTeX overlays. Geometry is sampled, including morph endpoints, tangents and nonlinear maps. Three.js native line width may be limited by WebGL. None of these are advertised as glyph-level Manim equivalence.

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