PREDICTIVE GEOMETRY CODING IN G-PCC

An example method of decoding a point cloud includes selecting, from a plurality of predefined prediction modes, a prediction mode for performing predictive geometric coding of a location of a current node of the point cloud, wherein the plurality of prediction modes includes at least: a zero prediction mode and a delta prediction mode; in response to selecting the zero prediction mode: determining a radius, an azimuth angle, and a laser index of a parent node of the current node; deducing the azimuth angle and the laser index of the predicted position of the current node as the azimuth angle and the laser index of a father node; inferring that the radius of the predicted location is a minimum radius value, wherein the minimum radius value is different from the radius of the parent node; and determining the position of the current node based on the predicted position of the current node. 解码点云的示例方法包括从多个预定义的预测模式中选择用于执行点云的当前节点的位置的预测几何编解码的预测模式，其中多个预测模式至少包括：零预测模式和增量预测模式；响应于选择零预测模式：确定当前节点的父节点的半径、方位角和激光器索引；将当前节点的预测位