VkRayTracingLssIndexingModeNV

Chaining LSS primitives can be achieved by specifying an index buffer in VkAccelerationStructureGeometryLinearSweptSpheresDataNV::indexData and setting VkAccelerationStructureGeometryLinearSweptSpheresDataNV::indexingMode to one of VkRayTracingLssIndexingModeNV values:

typedef enum VkRayTracingLssIndexingModeNV {
    VK_RAY_TRACING_LSS_INDEXING_MODE_LIST_NV = 0,
    VK_RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV = 1,
} VkRayTracingLssIndexingModeNV;

• VK_RAY_TRACING_LSS_INDEXING_MODE_LIST_NV specifies that a list of indices is provided where each consecutive pair of indices define a LSS primitive.
• VK_RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV specifies a successive implicit indexing format, in which each LSS primitive is defined by two successive positions and radii, (k, k + 1), where k is a single index provided in the index buffer. In this indexing scheme, there is a 1:1 mapping between the index buffer and primitive index within the geometry.