C Specification

If VkAccelerationStructureGeometryLinearSweptSpheresDataNV is included in the pNext chain of a VkAccelerationStructureGeometryKHR structure, then that structures defines the linear swept sphere’s (LSS) geometry data.

The VkAccelerationStructureGeometryLinearSweptSpheresDataNV structure is defined as:

// Provided by VK_NV_ray_tracing_linear_swept_spheres
typedef struct VkAccelerationStructureGeometryLinearSweptSpheresDataNV {
    VkStructureType                          sType;
    const void*                              pNext;
    VkFormat                                 vertexFormat;
    VkDeviceOrHostAddressConstKHR            vertexData;
    VkDeviceSize                             vertexStride;
    VkFormat                                 radiusFormat;
    VkDeviceOrHostAddressConstKHR            radiusData;
    VkDeviceSize                             radiusStride;
    VkIndexType                              indexType;
    VkDeviceOrHostAddressConstKHR            indexData;
    VkDeviceSize                             indexStride;
    VkRayTracingLssIndexingModeNV            indexingMode;
    VkRayTracingLssPrimitiveEndCapsModeNV    endCapsMode;
} VkAccelerationStructureGeometryLinearSweptSpheresDataNV;

Members

  • sType is a VkStructureType value identifying this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

  • vertexFormat is the VkFormat of each LSS vertex element.

  • vertexData is a device or host address of memory containing vertex data for this geometry.

  • vertexStride is the stride in bytes between each vertex element.

  • radiusFormat is the VkFormat of each LSS radius.

  • radiusData is a device or host address of memory containing LSS radius data value.

  • radiusStride is the stride in bytes between each radius value.

  • indexType is the VkIndexType of each index element.

  • indexData is a device or host address of memory containing index data for vertex and radius buffers for this geometry. When indexType is VK_INDEX_TYPE_NONE_KHR it must be NULL.

  • indexStride is the stride in bytes between each index element.

  • indexingMode is a VkRayTracingLssIndexingModeNV value specifying the mode of indexing.

  • endCapsMode is a VkRayTracingLssPrimitiveEndCapsModeNV value specifying the endcaps mode for LSS primitives.

Description

If an index buffer is not specified in indexData, LSS primitives are rendered individually using subsequent pairs of vertices similar to VK_PRIMITIVE_TOPOLOGY_LINE_LIST.

Valid Usage
Valid Usage (Implicit)

See Also

VK_NV_ray_tracing_linear_swept_spheres, VkDeviceOrHostAddressConstKHR, VkDeviceSize, VkFormat, VkIndexType, VkRayTracingLssIndexingModeNV, VkRayTracingLssPrimitiveEndCapsModeNV, VkStructureType

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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0