A graphics processing system includes a tiling unit configured to tile a first view of a scene into a plurality of tiles, a processing unit configured to identify a first subset of the tiles that are associated with regions of the scene that are viewable in a second view, and a rendering unit configured to render to a render target each of the identified tiles.

In some examples, a method of decoding a point cloud includes decoding an initial QP value from an attribute parameter set. The method also includes determining a first QP value for a first component of an attribute of point cloud data from the initial QP value. The method further includes determining a QP offset value for a second component of the attribute of the point cloud data and determining a second QP value for the second component of the attribute from the first QP value and from the QP offset value. The method includes decoding the point cloud data based on the first QP value and further based on the second QP value.

In some examples, a method of decoding a point cloud includes decoding an initial QP value from an attribute parameter set. The method also includes determining a first QP value for a first component of an attribute of point cloud data from the initial QP value. The method further includes determining a QP offset value for a second component of the attribute of the point cloud data and determining a second QP value for the second component of the attribute from the first QP value and from the QP offset value. The method includes decoding the point cloud data based on the first QP value and further based on the second QP value.

An image processing system includes at least one memory configured to store video data, and a processor configured to perform image processing on the video data. The processor is configured to select a preregistered target vehicle from among vehicles included in the video data. The processor is configured to clip, in the video data, a plurality of frames from the video data before the preregistered target vehicle is selected, and generate an image including the target vehicle by using the clipped frames.

An image processing system includes at least one memory configured to store video data, and a processor configured to perform image processing on the video data. The processor is configured to select a preregistered target vehicle from among vehicles included in the video data. The processor is configured to clip, in the video data, a plurality of frames from the video data before the preregistered target vehicle is selected, and generate an image including the target vehicle by using the clipped frames.

Methods, apparatus, devices, and systems for three-dimensional (3D) displaying objects are provided. In one aspect, a method includes obtaining data including respective primitive data for primitives corresponding to an object, determining an electromagnetic (EM) field contribution to each element of a display for each of the primitives by calculating an EM field propagation from the primitive to the element, generating a sum of the EM field contributions from the primitives for each of the elements, transmitting to each of the elements a respective control signal for modulating at least one property of the element based on the sum of the EM field contributions, and transmitting a timing control signal to an illuminator to activate the illuminator to illuminate light on the display, such that the light is caused by the modulated elements of the display to form a volumetric light field corresponding to the object.

Methods, apparatus, devices, and systems for three-dimensional (3D) displaying objects are provided. In one aspect, a method includes obtaining data including respective primitive data for primitives corresponding to an object, determining an electromagnetic (EM) field contribution to each element of a display for each of the primitives by calculating an EM field propagation from the primitive to the element, generating a sum of the EM field contributions from the primitives for each of the elements, transmitting to each of the elements a respective control signal for modulating at least one property of the element based on the sum of the EM field contributions, and transmitting a timing control signal to an illuminator to activate the illuminator to illuminate light on the display, such that the light is caused by the modulated elements of the display to form a volumetric light field corresponding to the object.

Methods and apparatus to facilitate 3D object visualization and manipulation across multiple devices are disclosed. Example apparatus disclosed herein include a viewpoint determiner, a visible shard determiner, and a laminate assembler. The viewpoint determiner determines a viewpoint location of a viewpoint corresponding to a viewing device, the viewpoint location being in a reference frame of a three-dimensional (3D) model. The visible shard determiner determines a visible shard set of the 3D model based on the viewpoint location. The laminate assembler generates a two-dimensional (2D) image of the visible shard set.

A frustum bounds a subset of rays projected into a virtual scene to be rendered. The frustum is transformed from a Cartesian coordinate space to a spherical coordinate space using a transform matrix that places a central ray of the frustum as the Z-axis. A projection hemisphere centered around the central ray is defined. The extents of the intersection of the transformed frustum and the surface of the projection hemisphere are bound by a frustum circle. A geometric object in the scene or a bounding volume is bound by a bounding sphere, which is transformed into the spherical coordinate system using the transform matrix, and then projected onto the surface of the projection sphere to define a bounding circle. The frustum is identified as intersecting the geometric object or bounding volume responsive to angular overlap and distance overlap between the frustum circle and the bounding circle.

A frustum bounds a subset of rays projected into a virtual scene to be rendered. The frustum is transformed from a Cartesian coordinate space to a spherical coordinate space using a transform matrix that places a central ray of the frustum as the Z-axis. A projection hemisphere centered around the central ray is defined. The extents of the intersection of the transformed frustum and the surface of the projection hemisphere are bound by a frustum circle. A geometric object in the scene or a bounding volume is bound by a bounding sphere, which is transformed into the spherical coordinate system using the transform matrix, and then projected onto the surface of the projection sphere to define a bounding circle. The frustum is identified as intersecting the geometric object or bounding volume responsive to angular overlap and distance overlap between the frustum circle and the bounding circle.