VkPartitionedAccelerationStructureInstanceFlagBitsNV(3)

# VkPartitionedAccelerationStructureInstanceFlagBitsNV(3) Manual Page

## Name

VkPartitionedAccelerationStructureInstanceFlagBitsNV - Bitmask specifying flags for PTLAS instances

## C Specification

Bits which can be set in VkPartitionedAccelerationStructureWriteInstanceDataNV::`instanceFlags`, specifying flags for instances, are:

    // Provided by VK_NV_partitioned_acceleration_structure
    typedef enum VkPartitionedAccelerationStructureInstanceFlagBitsNV {
        VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_TRIANGLE_FACING_CULL_DISABLE_BIT_NV = 0x00000001,
        VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_TRIANGLE_FLIP_FACING_BIT_NV = 0x00000002,
        VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_FORCE_OPAQUE_BIT_NV = 0x00000004,
        VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_FORCE_NO_OPAQUE_BIT_NV = 0x00000008,
        VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_ENABLE_EXPLICIT_BOUNDING_BOX_NV = 0x00000010,
    } VkPartitionedAccelerationStructureInstanceFlagBitsNV;

## Description

- VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_TRIANGLE_FACING_CULL_DISABLE_BIT_NV disables face culling for this instance.

- VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_TRIANGLE_FLIP_FACING_BIT_NV specifies that the facing determination for geometry in this instance is inverted.

- VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_FORCE_OPAQUE_BIT_NV causes this instance to act as though VK_GEOMETRY_OPAQUE_BIT_KHR were specified on all geometries referenced by this instance.

- VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_FORCE_NO_OPAQUE_BIT_NV causes this instance to act as though VK_GEOMETRY_OPAQUE_BIT_KHR were not specified on all geometries referenced by this instance.

- VK_PARTITIONED_ACCELERATION_STRUCTURE_INSTANCE_FLAG_ENABLE_EXPLICIT_BOUNDING_BOX_NV enables use of an explicit bounding box for this instance.

## See Also

VK_NV_partitioned_acceleration_structure, VkPartitionedAccelerationStructureInstanceFlagsNV

## 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