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Drake
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Drake
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Configuration of a camera.
This covers all of the parameters for both color (see geometry::render::ColorRenderCamera) and depth (see geometry::render::DepthRenderCamera) cameras.
The various properties have restrictions on what they can be.
clipping_near, clipping_far] and depth range [z_near, z_far].The values are only checked when the configuration is operated on: during serialization, after deserialization, and when applying the configuration (see ApplyCameraConfig().)
#include <drake/systems/sensors/camera_config.h>
Classes | |
| struct | FocalLength |
| Specification of a camera's intrinsic focal properties as focal length (in pixels). More... | |
| struct | FovDegrees |
| Specification of focal length via fields of view (in degrees). More... | |
Public Member Functions | |
| template<typename Archive > | |
| void | Serialize (Archive *a) |
| Passes this object to an Archive. More... | |
| std::pair< geometry::render::ColorRenderCamera, geometry::render::DepthRenderCamera > | MakeCameras () const |
| Creates color and depth camera data from this configuration. More... | |
| void | ValidateOrThrow () const |
| Throws if the values are inconsistent. More... | |
Public Attributes | |
Frustum-based camera properties | |
| double | clipping_near {0.01} |
| The distance (in meters) from sensor origin to near clipping plane. More... | |
| double | clipping_far {500.0} |
| The distance (in meters) from sensor origin to far clipping plane. More... | |
Depth camera range | |
| double | z_near {0.1} |
| The distance (in meters) from sensor origin to closest measurable plane. More... | |
| double | z_far {5.0} |
| The distance (in meters) from sensor origin to farthest measurable plane. More... | |
Camera extrinsics | |
The pose of the camera. As documented in RgbdSensor, the camera has four associated frames: P, B, C, D. The frames of the parent (to which the camera body is rigidly affixed), the camera body, color sensor, and depth sensor, respectively. Typically, the body is posed w.r.t. the parent (X_PB) and the sensors are posed w.r.t. the body (X_BC and X_BD). When unspecified, X_BD = X_BC = I by default. | |
| schema::Transform | X_PB |
| The pose of the body camera relative to a parent frame P. More... | |
| schema::Transform | X_BC |
| The pose of the color sensor relative to the camera body frame. More... | |
| schema::Transform | X_BD |
| The pose of the depth sensor relative to the camera body frame. More... | |
Renderer properties | |
Every camera is supported by a geometry::render::RenderEngine instance. These properties configure the render engine for this camera. | |
| std::string | renderer_name {"default"} |
| The name of the geometry::render::RenderEngine that this camera uses. More... | |
| std::variant< std::string, geometry::RenderEngineVtkParams, geometry::RenderEngineGlParams, geometry::RenderEngineGltfClientParams > | renderer_class {""} |
| The choice of render engine implementation to use. More... | |
| geometry::Rgba | background {204 / 255.0, 229 / 255.0, 255 / 255.0, 1.0} |
| The "background" color. More... | |
Publishing properties | |
| std::string | name {"preview_camera"} |
| The camera name. More... | |
| double | fps {10.0} |
| Publishing rate (in Hz) for both RGB and depth cameras (as requested). More... | |
| double | capture_offset {0.0} |
| Phase offset (in seconds) for image capture, relative to the simulator's time zero. More... | |
| double | output_delay {0.0} |
| Delay (in seconds) between when the scene graph geometry is "captured" and when the output image is published. More... | |
| bool | rgb {true} |
| If true, RGB images will be produced and published via LCM. More... | |
| bool | depth {false} |
| If true, depth images will be produced and published via LCM. More... | |
| bool | label {false} |
| If true, label images will be produced and published via LCM. More... | |
| bool | show_rgb {false} |
| Controls whether the rendered RGB and/or label images are displayed (in separate windows controlled by the thread in which the camera images are rendered). More... | |
| bool | do_compress {true} |
| Controls whether the images are broadcast in a compressed format. More... | |
| std::string | lcm_bus {"default"} |
| Which LCM URL to use. More... | |
Camera intrinsics | |
See CameraInfo. | |
| int | width {640} |
| Image width (in pixels). More... | |
| int | height {480} |
| Image height (in pixels). More... | |
| std::variant< FocalLength, FovDegrees > | focal {FovDegrees{.y = 45}} |
| The focal properties of the camera. More... | |
| std::optional< double > | center_x {} |
| The x-position of the principal point (in pixels). More... | |
| std::optional< double > | center_y {} |
| The y-position of the principal point (in pixels). More... | |
| double | focal_x () const |
| Returns the focal length (in pixels) in the x-direction. More... | |
| double | focal_y () const |
| Returns the focal length (in pixels) in the y-direction. More... | |
| Vector2< double > | principal_point () const |
| Returns the position of the principal point. More... | |
| double focal_x | ( | ) | const |
Returns the focal length (in pixels) in the x-direction.
| double focal_y | ( | ) | const |
Returns the focal length (in pixels) in the y-direction.
| std::pair<geometry::render::ColorRenderCamera, geometry::render::DepthRenderCamera> MakeCameras | ( | ) | const |
Creates color and depth camera data from this configuration.
| std::exception | if configuration values do not satisfy the documented prerequisites. |
Returns the position of the principal point.
This respects the semantics that undefined center_x and center_y place the principal point in the center of the image.
| void Serialize | ( | Archive * | a | ) |
Passes this object to an Archive.
Refer to YAML Serialization for background.
| void ValidateOrThrow | ( | ) | const |
Throws if the values are inconsistent.
| geometry::Rgba background {204 / 255.0, 229 / 255.0, 255 / 255.0, 1.0} |
The "background" color.
This is the color drawn where there are no objects visible. Its default value matches the default value for render::RenderEngineVtkParams::default_clear_color. See the documentation for geometry::Rgba::Serialize for how to define this value in YAML.
This value is used only if the render_class specifies either "RenderEngineVtk" or "RenderEngineGl" by name (RenderEngineGltfClient doesn't have a configurable background color.)
| double capture_offset {0.0} |
Phase offset (in seconds) for image capture, relative to the simulator's time zero.
This can be useful to stagger multiple cameras. Refer to the RgbdSensorAsync class for a comprehensive description.
| std::optional<double> center_x {} |
The x-position of the principal point (in pixels).
To query what the current value is, use principal_point().
| std::optional<double> center_y {} |
The y-position of the principal point (in pixels).
To query what the current value is, use principal_point().
| double clipping_far {500.0} |
The distance (in meters) from sensor origin to far clipping plane.
| double clipping_near {0.01} |
The distance (in meters) from sensor origin to near clipping plane.
| bool depth {false} |
If true, depth images will be produced and published via LCM.
| bool do_compress {true} |
Controls whether the images are broadcast in a compressed format.
| std::variant<FocalLength, FovDegrees> focal {FovDegrees{.y = 45}} |
The focal properties of the camera.
It can be specified in one of two ways:
For both specifications, if only one value is given (in either direction), the focal length (as reported by focal_x() and focal_y()) is determined by that single value and is assumed to be symmetric for both directions.
| double fps {10.0} |
Publishing rate (in Hz) for both RGB and depth cameras (as requested).
| int height {480} |
Image height (in pixels).
| bool label {false} |
If true, label images will be produced and published via LCM.
| std::string lcm_bus {"default"} |
Which LCM URL to use.
| std::string name {"preview_camera"} |
The camera name.
This name is used as part of the corresponding RgbdSensor system's name and serves as a suffix of the LCM channel name.
name is not empty. | double output_delay {0.0} |
Delay (in seconds) between when the scene graph geometry is "captured" and when the output image is published.
Refer to the RgbdSensorAsync class for a comprehensive description.
| std::variant<std::string, geometry::RenderEngineVtkParams, geometry::RenderEngineGlParams, geometry::RenderEngineGltfClientParams> renderer_class {""} |
The choice of render engine implementation to use.
It can be specified simply by providing a string containing the class name of the RenderEngine to use (i.e., "RenderEngineVtk", "RenderEngineGl", or "RenderEngineGltfClient"). Or, it can be specified by providing parameters for one of those engines: RenderEngineVtkParams, RenderEngineGlParams, or RenderEngineGltfClientParams.
If a string containing the render engine class name is provided, the engine instantiated will use the default parameters – equivalent to passing the set of default parameters.
It is possible for multiple cameras to reference the same renderer_name but configure the renderer differently. This would be a configuration error. The following rules will help prevent problematic configurations:
renderer_name.renderer_name, only the first can use the engine parameters to specify it. Attempting to do so with a later camera will produce an error.In YAML, it can be a bit trickier. Depending on how a collection of cameras is articulated, the concept of "first" may be unclear. In examples/hardware_sim/scenario.h the collection is a map. So, the camera configurations are not necessarily processed in the order they appear in the YAML file. Instead, the processing order depends on the mnemonic camera key. So, be aware, if you use a similar mapping, you may have to massage the key names to achieve the requisite processing order. Alternatively, a vector of CameraConfig in your own scenario file, would guarantee that processing order is the same as file order.
We intend to relax these restrictions in time, allowing equivalent, redundant specifications of a render engine (and throwing only on inconsistent specifications).
Passing the empty string is equivalent to saying, "I don't care". If a render engine with that name has already been configured, the camera will use it (regardless of type). If the name doesn't already exist, the default, slower, more portable, and more robust RenderEngineVtk will be instantiated. RenderEngineGl can be selected if you are on Ubuntu and need the improved performance (at the possible cost of lesser image fidelity). In YAML, omitting renderer_class from the camera specification is equivalent to "passing the empty string".
It isn't always obvious what the proper spelling in YAML is. The following examples illustrate how the renderer_class field can be defined in YAML files.
Things to note:
! to announce it as a type (examples 2, 3, and 4).{} (example 2).default_clear_color in examples 3 and 4).renderer_class is a string and either empty or one of "RenderEngineVtk", "RenderEngineGl", or "RenderEngineGltfClient", or, it is a parameter type of one of Drake's RenderEngine implementations. | std::string renderer_name {"default"} |
The name of the geometry::render::RenderEngine that this camera uses.
Generally, it is more efficient for multiple cameras to share a single render engine instance; they should, therefore, share a common renderer_name value.
renderer_name is not empty. | bool rgb {true} |
If true, RGB images will be produced and published via LCM.
| bool show_rgb {false} |
Controls whether the rendered RGB and/or label images are displayed (in separate windows controlled by the thread in which the camera images are rendered).
As both image types are rendered from ColorRenderCamera, it applies to both of them and depends on whether the RenderEngine instance supports it.
Note: This flag is intended for quick debug use during development instead of serving as an image viewer. Currently, there are known issues, e.g., flickering windows when multiple cameras share the same renderer or upside-down images if RenderEngineGl is set. See issue #18862 for the proposal to visualize images via Meldis.
| int width {640} |
Image width (in pixels).
| schema::Transform X_BC |
The pose of the color sensor relative to the camera body frame.
X_BC.base_frame is empty. | schema::Transform X_BD |
The pose of the depth sensor relative to the camera body frame.
X_BD.base_frame is empty. | schema::Transform X_PB |
The pose of the body camera relative to a parent frame P.
If X_PB.base_frame is unspecified, then the world frame is assumed to be the parent frame.
X_PB.base_frame is empty or refers to a valid, unique frame. | double z_far {5.0} |
The distance (in meters) from sensor origin to farthest measurable plane.
| double z_near {0.1} |
The distance (in meters) from sensor origin to closest measurable plane.