# VkRayTracingLssIndexingModeNV(3) Manual Page

## Name

VkRayTracingLssIndexingModeNV - LSS indexing mode

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## C Specification

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

    // Provided by VK_NV_ray_tracing_linear_swept_spheres
    typedef enum VkRayTracingLssIndexingModeNV {
        VK_RAY_TRACING_LSS_INDEXING_MODE_LIST_NV = 0,
        VK_RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV = 1,
    } VkRayTracingLssIndexingModeNV;

## Description

- `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.

## See Also

VK_NV_ray_tracing_linear_swept_spheres, VkAccelerationStructureGeometryLinearSweptSpheresDataNV

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0