Point Data

mental ray supports to store positional data with custom properties in the scene database for various purposes. This allows to implement rendering effects which are not attached to a surface but to a point in space (or time), like global illumination data. Custom applications and shaders may use it to compute and render particle systems or fluid density grids with mental ray. Most of the internal point data structures in mental ray which are used for caching purposes like the photon map are stored in proprietary formats, giving the freedom to adjust their behavior at any time in order to add new features or improve performance. The map data container, on the other hand, is a general data storage for point-based data, and designed to be suited for exchange of public information within the same or with other similar applications.

Map Data 3.7

The map data container allows to store point-like information in mental ray with built-in support for back-up in external disk files. The mandatory position of the point can be specified in 1-dimensional up to 6-dimensional space, typical applications may use the 2D or 3D space. Any number of additional data item can be attached to a point or particle, each identified by type and name. This makes the map data container a perfect candidate for passing information between renderings, like between frames of an animation, or even from and to other rendering solutions. In addition, mental ray is optimizing common access and lookup methods with the help of acceleration techniques that are optimized for sparse and non-uniform distributions of the data, like arbitrary clouds of points.

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