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The NeL PACS library comprises world surface representations for content movement and collision management for both server and client applications.

Todo. {.is-danger}

• Both landscape and enclosed spaces are supported.
• PACS can either be linked to application as a library or run as a pair of stand-alone service.

• Algorithm for determining (non-convex) surface list for a path
• Surface border skirting algorithm for generating paths across surfaces

• There is support for both object-object collisions and object-scenery collisions.
• Objects are divided into static solid objects, dynamic solid objects and dynamic 'ghost' objects that have no impact on the scenery
• Both Logical collisions and Blocking collisions are supported
• Blocking collisions may be treated as 'sticky', 'sliding' or 'bounce'
• Object collision primitives include cylinders and cuboids.
• PACS may maintain a collision space history which allows re-tracing of movement information received late, by the server, through the world as it was for lag management purposes.

• Landscape scenery is converted directly to a surface representation by exported data re-processing utilities.
• Streets and interiors must have explicit collision models (surface models) which are exported from 3ds Max and processed to generate the same surface representation.

• shapes: This sample demonstrates creating and moving move primitives, colliding them with other primitives, collecting the triggers and managing world images.

• Landscape