torchdrivesim.rendering.base

Base class for renderers producing rasterized birdview images from given background meshes and agent positions.

Module Contents

Classes

RendererConfig	Determines behavior of the renderer.
DummyRendererConfig	For DummyRenderer.
BirdviewRenderer	A renderer producing simple 2D birdview images based on static background meshes and rectangular agents.
DummyRenderer	Produces a black image of the required size. Mostly used for debugging and benchmarking.

Functions

construct_pytorch3d_cameras(...)	Create PyTorch3D cameras object for given positions and orientations.
get_default_rendering_levels(→ Dict[str, float])	Produces the default rendering levels, mapping object categories
get_default_color_map(→ Dict[str, Tuple[int, int, int]])	Produces the default color map, mapping object categories

Attributes

logger

torchdrivesim.rendering.base.logger

class torchdrivesim.rendering.base.RendererConfig

Determines behavior of the renderer. Subclasses determine renderer class used.

backend: str = 'default'

render_agent_direction: bool = True

left_handed_coordinates: bool = False

highlight_ego_vehicle: bool = False

class torchdrivesim.rendering.base.DummyRendererConfig

Bases: RendererConfig

For DummyRenderer.

backend: str = 'dummy'

class torchdrivesim.rendering.base.BirdviewRenderer(cfg: RendererConfig, device: torch.device | None = None, batch_size: int | None = None, static_mesh: torchdrivesim.mesh.BirdviewMesh | None = None, world_center: torch.Tensor | None = None, color_map: Dict[str, Tuple[int, int, int]] | None = None, rendering_levels: Dict[str, float] | None = None, res: torchdrivesim.utils.Resolution = Resolution(64, 64), fov: float = 35)

Bases: abc.ABC

A renderer producing simple 2D birdview images based on static background meshes and rectangular agents. Currently only square resolutions are supported. The renderer always operates in batch mode, with a single batch dimension on the left.

Parameters:

• cfg – configuration object, usually subclassed

• device – torch device used for rendering

• batch_size – if road_mesh is not specified, this is used to determine batch size

• static_mesh – BirdviewMesh object specifying drivable surface (empty mesh is used if not provided)

• world_center – Bx2 float tensor, defaults to geometric centre of the road mesh

• color_map – a dictionary of RGB tuples in 0-255 range specifying colors of different rendered elements

• res – default resolution

get_color(element_type: str) → Tuple[int, int, int]

to(device: torch.device)

Moves the renderer to another device in place.

add_static_meshes(meshes: List[torchdrivesim.mesh.BirdviewMesh]) → None

Includes additional static elements to render.

copy()

expand(n: int)

Adds another dimension with size n on the right of the batch dimension and flattens them. Returns a new renderer, without modifying the current one.

select_batch_elements(idx: torch.Tensor)

Selects given elements from the batch, potentially with repetitions. Returns a new renderer, without modifying the current one.

Parameters:

idx – one-dimensional integer tensor

render_static_meshes(camera_xy: torch.Tensor | None = None, camera_sc: torch.Tensor | None = None, res: torchdrivesim.utils.Resolution = None, fov: float = None) → torch.Tensor

Render a single birdview of the static mesh only. Nc is the number of cameras. C=3 is the number of RGB channels.

Parameters:

• camera_xy – Ncx2 tensor of camera positions

• camera_sc – Ncx2 tensor of camera orientations (sine and cosine of yaw angle)

• res – Resolution, currently only square resolutions are supported

• fov – Field of view in meters

Returns:

birdview image tensor of shape NcxHxWxC

transform(points: torch.Tensor, pose: torch.Tensor) → torch.Tensor

Given points relative to a pose, produce absolute positions of the points. There can be zero or more batch dimensions.

Parameters:

• points – BxNx2 tensor

• pose – Bx3 tensor of position (x,y) and orientation (yaw angle in radians)

Returns:

Bx2 tensor of absolute positions

make_actor_mesh(agent_state: Dict[str, torch.Tensor], agent_attributes: Dict[str, torch.Tensor]) → torchdrivesim.mesh.BirdviewMesh

Creates a mesh representing given actors. Each vertex and each face corresponds to a unique agent and both vertices and faces for each agent are continuous in the resulting tensor to allow for subsequent masking. For each agent there are seven vertices and three faces, specifying its bounding box and direction. Direction vertices use the ‘direction’ category, while agent categories are copied from input dictionaries.

render_frame(agent_state: Dict[str, torch.Tensor], agent_attributes: Dict[str, torch.Tensor], camera_xy: torch.Tensor | None = None, camera_sc: torch.Tensor | None = None, rendering_mask: Dict[str, torch.Tensor] = None, res: torchdrivesim.utils.Resolution | None = None, traffic_controls: Dict[str, torchdrivesim.traffic_controls.BaseTrafficControl] | None = None, fov: float | None = None, waypoints: torch.Tensor | None = None, waypoints_rendering_mask: torch.Tensor | None = None) → torch.Tensor

Renders the agents and traffic controls on top of the static mesh. Cameras batch size is (B*Nc), which corresponds to using Nc cameras per batch element. This extra dimension is added on the right of batch dimension and flattened, to match the semantics of extend from pytorch3d. If cameras is None, one egocentric camera per agent is used, that is Nc = A.

Parameters:

• agent_state – maps agent types to state tensors of shape BxAxSt, where St >= 3 and the first three components are x coordinate, y coordinate, and orientation in radians

• agent_attributes – maps agent types to static attributes tensors of shape BxAxAttr, where Attr >= 2 and the first two components are length and width of the agent

• camera_xy – BxNcx2 tensor of camera positions, by default one camera placed on each agent

• camera_sc – BxNcx2 tensor of camera orientations (sine and cosine), by default matching agent orientations

• rendering_mask – BxNcxA tensor per agent type, indicating which cameras see which agents

• res – resolution HxW of the resulting image, currently only square resolutions are supported

• traffic_controls – traffic controls by type (traffic-light, yield, etc.)

• fov – Field of view in meters

• waypoints – BxNcxMx2 tensor of M waypoints per camera (x,y)

• waypoints_rendering_mask – BxNcxM tensor of M waypoint masks per camera, indicating which waypoints should be rendered

Returns:

tensor image of float RGB values in [0,255] range with shape shape (B*Nc)xAxCxHxW

abstract render_mesh(mesh: torchdrivesim.mesh.BirdviewMesh, res: torchdrivesim.utils.Resolution, cameras: pytorch3d.renderer.FoVOrthographicCameras) → torch.Tensor

Renders a given mesh, producing BxHxWxC tensor image of float RGB values in [0,255] range.

construct_cameras(xy: torch.Tensor, sc: torch.Tensor, scale: float | None = None) → pytorch3d.renderer.FoVOrthographicCameras

Create PyTorch3D cameras object for given positions and orientations. Input tensor dimensions should be Bx2.

build_verts_faces_from_bounding_box(bbs: torch.Tensor, z: float = 2) → Tuple[torch.Tensor, torch.Tensor]

Triangulates actors for rendering. Input is a tensor of bounding boxes of shape …xAx4x2, where A is the number of actors. Outputs are shaped …x4*Ax2 and …x2*Ax3 respectively.

make_traffic_controls_mesh(traffic_controls: Dict[str, torchdrivesim.traffic_controls.BaseTrafficControl]) → torchdrivesim.mesh.BirdviewMesh

Create a mesh showing traffic controls.

make_direction_mesh(lenwid: torch.Tensor, pose: torch.Tensor, size: float = 0.3) → torchdrivesim.mesh.BaseMesh

Create a mesh indicating the direction of each agent.

Parameters:

• lenwid – BxAx2 tensor specifying length and width of the agents

• pose – Bx3 tensor of position (x,y) and orientation (yaw angle in radians)

• size – determines the size of the triangle indicating direction

make_waypoint_mesh(waypoints: torch.Tensor, radius: float = 2.0, num_triangles: int = 10) → torchdrivesim.mesh.BirdviewMesh

Create a mesh of the given waypoints.

Parameters:

• waypoints – BxNcxMx3 tensor of M waypoints per camera (x,y,psi)

• radius – float radius of the disc

• num_triangles – int number of triangles used for the disc

class torchdrivesim.rendering.base.DummyRenderer(cfg: RendererConfig, device: torch.device | None = None, batch_size: int | None = None, static_mesh: torchdrivesim.mesh.BirdviewMesh | None = None, world_center: torch.Tensor | None = None, color_map: Dict[str, Tuple[int, int, int]] | None = None, rendering_levels: Dict[str, float] | None = None, res: torchdrivesim.utils.Resolution = Resolution(64, 64), fov: float = 35)

Bases: BirdviewRenderer

Produces a black image of the required size. Mostly used for debugging and benchmarking.

render_mesh(mesh: torchdrivesim.mesh.BirdviewMesh, res: torchdrivesim.utils.Resolution, cameras: pytorch3d.renderer.FoVOrthographicCameras) → torch.Tensor

Renders a given mesh, producing BxHxWxC tensor image of float RGB values in [0,255] range.

torchdrivesim.rendering.base.construct_pytorch3d_cameras(xy: torch.Tensor, sc: torch.Tensor, scale: float) → pytorch3d.renderer.FoVOrthographicCameras

Create PyTorch3D cameras object for given positions and orientations. Input tensor dimensions should be Bx2.

torchdrivesim.rendering.base.get_default_rendering_levels() → Dict[str, float]

Produces the default rendering levels, mapping object categories to their rendering level. Lower level renders on top, but levels lower than 0 don’t render at all.

torchdrivesim.rendering.base.get_default_color_map() → Dict[str, Tuple[int, int, int]]

Produces the default color map, mapping object categories to RGB 3-tuples in [0,255] range.