simvx.core.mesh_instance_2d

MeshInstance2D: custom 2D mesh rendering node.

Renders arbitrary 2D geometry defined by vertices, indices, UVs, and per-vertex colours. Useful for deformable shapes, terrain slices, soft-body visuals, and any geometry that doesn’t fit a simple sprite or polygon.

Module Contents

Classes

Mesh2D	Immutable-ish 2D mesh data: vertices, triangle indices, UVs, and per-vertex colours.
MeshInstance2D	Renders a custom 2D mesh defined by a :class:Mesh2D.

Data

log
__all__

API

simvx.core.mesh_instance_2d.log

‘getLogger(…)’

simvx.core.mesh_instance_2d.__all__

[‘Mesh2D’, ‘MeshInstance2D’]

class simvx.core.mesh_instance_2d.Mesh2D

Immutable-ish 2D mesh data: vertices, triangle indices, UVs, and per-vertex colours.

Vertices and UVs are stored as (N, 2) float32 arrays. Colours are (N, 4) float32 RGBA. Indices are a flat uint32 array where every three consecutive values form one triangle.

Factory class-methods create common primitives with correct winding and UVs.

vertices: numpy.ndarray

‘field(…)’

indices: numpy.ndarray

‘field(…)’

uvs: numpy.ndarray

‘field(…)’

colours: numpy.ndarray

‘field(…)’

__post_init__()

property vertex_count: int

property triangle_count: int

property is_empty: bool

get_aabb() → tuple[simvx.core.math.types.Vec2, simvx.core.math.types.Vec2]

Axis-aligned bounding box as (min_corner, max_corner).

classmethod from_polygon(points: list | numpy.ndarray) → simvx.core.mesh_instance_2d.Mesh2D

Fan-triangulate a convex polygon.

Points should be in order (CW or CCW). UVs are derived from the bounding box. All vertices share white colour.

classmethod from_rect(width: float, height: float, centered: bool = True) → simvx.core.mesh_instance_2d.Mesh2D

Axis-aligned rectangle as two triangles.

When centered the origin is at the rectangle centre; otherwise it is at the top-left corner.

classmethod from_circle(radius: float, segments: int = 32) → simvx.core.mesh_instance_2d.Mesh2D

Regular polygon approximating a circle centred at the origin.

classmethod from_grid(width: float, height: float, cols: int, rows: int, centered: bool = True) → simvx.core.mesh_instance_2d.Mesh2D

Subdivided rectangle useful for terrain slices or deformation grids.

Creates a cols x rows quad grid ((cols+1)*(rows+1) vertices).

class simvx.core.mesh_instance_2d.MeshInstance2D(mesh: simvx.core.mesh_instance_2d.Mesh2D | None = None, modulate: tuple = (1.0, 1.0, 1.0, 1.0), position=None, rotation: float = 0.0, scale=None, **kwargs)

Bases: simvx.core.nodes_2d.node2d.Node2D

Renders a custom 2D mesh defined by a :class:Mesh2D.

The mesh vertices are in local space and transformed by the node’s position, rotation, and scale before drawing. A modulate colour tints the output (per-vertex colours, when present, multiply against it).

Example::

mesh = Mesh2D.from_rect(64, 64)
node = MeshInstance2D(mesh=mesh, modulate=(1, 0, 0, 1))
root.add_child(node)

Initialization

modulate

‘Colour(…)’

property mesh: simvx.core.mesh_instance_2d.Mesh2D | None

on_draw(renderer) → None

Emit mesh triangles through the renderer’s immediate-mode API.

position

‘_SpatialVecProperty(…)’

rotation

‘Property(…)’

scale

‘_SpatialVecProperty(…)’

top_level

‘Property(…)’

z_index

‘Property(…)’

z_as_relative

‘Property(…)’

render_layer

‘Property(…)’

set_render_layer(index: int, enabled: bool = True) → None

is_on_render_layer(index: int) → bool

property absolute_z_index: int

property rotation_degrees: float

property world_position: simvx.core.math.types.Vec2

property world_rotation: float

property world_scale: simvx.core.math.types.Vec2

property world_transform: tuple[simvx.core.math.types.Vec2, simvx.core.math.types.Vec2, float]

property forward: simvx.core.math.types.Vec2

property right: simvx.core.math.types.Vec2

translate(offset: tuple[float, float] | numpy.ndarray)

rotate(radians: float)

rotate_deg(degrees: float)

look_at(target: tuple[float, float] | numpy.ndarray)

to_global(point) → simvx.core.math.types.Vec2

to_local(point) → simvx.core.math.types.Vec2

transform_points(points: list[simvx.core.math.types.Vec2]) → list[simvx.core.math.types.Vec2]

wrap_screen(margin: float = 20)

post_processed

‘Property(…)’

property transform_render_dirty: bool

strict_errors: ClassVar[bool]

True

dev_checks: ClassVar[bool]

None

dev_warnings: ClassVar[bool]

None

freeze_check_interval: ClassVar[float]

1.0

dynamic: bool

False

visible

‘Property(…)’

update_mode

‘Property(…)’

focus_mode

‘Property(…)’

drag_threshold

‘Property(…)’

focus_entered

‘Signal(…)’

focus_exited

‘Signal(…)’

__properties__: ClassVar[dict[str, simvx.core.descriptors.Property]]

None

classmethod __init_subclass__(**kwargs)

property name: str

property visible_in_tree: bool

property input_player: simvx.core.input.players.InputPlayer

property input_context: simvx.core.input.contexts.InputContext | None

reset_error() → None

add_child(node: simvx.core.node.T) → simvx.core.node.T

remove_child(node: simvx.core.node.Node) → None

reparent(new_parent: simvx.core.node.Node)

node_at(path, default=_NO_DEFAULT)

find(target, *, direct: bool = False)

find_all(target, *, direct: bool = False)

expect(target, *, direct: bool = False)

ancestor(target)

walk(*, include_self: bool = True) → collections.abc.Iterator[simvx.core.node.Node]

property path: str

property is_scene_root: bool

add_to_group(group: str)

remove_from_group(group: str)

is_in_group(group: str) → bool

on_ready() → None

on_enter_tree() → None

on_exit_tree() → None

on_update(dt: float) → None

on_fixed_update(dt: float) → None

on_draw_3d(gizmos) → None

on_picked(event: simvx.core.input.events.PickEvent) → bool | None

on_gui_input(event: simvx.core.input.events.GuiInputEvent) → bool | None

start_coroutine(gen: simvx.core.descriptors.Coroutine) → simvx.core.descriptors.CoroutineHandle

stop_coroutine(gen_or_handle)

property focused: bool

property focus_rect: tuple[float, float, float, float] | None

drag_threshold_for(pointer_type: simvx.core.input.enums.PointerType | str) → float

grab_focus() → None

release_focus() → None

capture_pointer(pointer_id: int | None = None) → None

release_pointer(pointer_id: int | None = None) → None

queue_redraw() → None

property render_dirty: bool

clear_children()

destroy()

property destroying: bool

property destroyed: bool

call_deferred(method: collections.abc.Callable[..., Any], *args: Any) → None

property app

property tree: simvx.core.scene_tree.SceneTree

property viewport_size: simvx.core.math.types.Vec2

property viewport_insets: tuple[float, float, float, float]

property physics

property physics_2d

__getitem__(key: str)

classmethod get_properties() → dict[str, simvx.core.descriptors.Property]

__repr__()