osg ImagePyramid

The OpenSceneGraph (OSG) ImagePyramid is a data structure that stores a large image as a set of smaller images or tiles, arranged in a hierarchical manner. Each level of the pyramid contains an image that is half the size of the image in the previous level, with the smallest level containing a single tile.

The ImagePyramid allows for efficient rendering of large images by loading only the necessary tiles to display the current view. This reduces memory requirements and improves performance, especially when dealing with very large images or remote data sources.

In OSG, the ImagePyramid is typically used for texture mapping, where the image tiles are used to create a texture that is applied to a 3D model. The ImagePyramid can also be used for other purposes, such as terrain elevation data, where each level represents a different level of detail.

Overall, the OSG ImagePyramid is a useful tool for managing large image data sets, allowing for efficient rendering and reducing memory requirements.