Registered Extension Number

430

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

SPIR-V Dependencies

Contact

Extension Proposal

Other Extension Metadata

Last Modified Date

2025-01-03

Interactions and External Dependencies
Contributors
  • Vikram Kushwaha, NVIDIA

  • Eric Werness, NVIDIA

  • Daniel Koch, NVIDIA

  • Ashwin Lele, NVIDIA

  • Nathan Morrical, NVIDIA

Description

This extension adds two new primitives for ray tracing: a sphere primitive and a linear swept sphere (LSS) primitive. The purpose of the LSS primitive is to enable rendering of high quality hair and fur using a compact primitive representation encoded in the acceleration structure. Sphere primitives are defined by a position and a radius and are a subset of LSS, but are useful in their own right, for example for particle systems.

This extension adds support for the following SPIR-V extension in Vulkan:

  • SPV_NV_linear_swept_spheres

New Structures

New Enums

New Enum Constants

  • VK_NV_RAY_TRACING_LINEAR_SWEPT_SPHERES_EXTENSION_NAME

  • VK_NV_RAY_TRACING_LINEAR_SWEPT_SPHERES_SPEC_VERSION

  • Extending VkFormatFeatureFlagBits2:

    • VK_FORMAT_FEATURE_2_ACCELERATION_STRUCTURE_RADIUS_BUFFER_BIT_NV

  • Extending VkGeometryTypeKHR:

    • VK_GEOMETRY_TYPE_LINEAR_SWEPT_SPHERES_NV

    • VK_GEOMETRY_TYPE_SPHERES_NV

  • Extending VkPipelineCreateFlagBits2:

    • VK_PIPELINE_CREATE_2_RAY_TRACING_ALLOW_SPHERES_AND_LINEAR_SWEPT_SPHERES_BIT_NV

  • Extending VkStructureType:

    • VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_LINEAR_SWEPT_SPHERES_DATA_NV

    • VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_SPHERES_DATA_NV

    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_LINEAR_SWEPT_SPHERES_FEATURES_NV

New or Modified Built-In Variables

New SPIR-V Capabilities

Version History

  • Revision 1, 2025-01-03 (Vikram Kushwaha)

    • Initial draft

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0