# VkPhysicalDeviceRayTracingPropertiesNV(3) Manual Page

## Name

VkPhysicalDeviceRayTracingPropertiesNV - Properties of the physical device for ray tracing

## C Specification

The `VkPhysicalDeviceRayTracingPropertiesNV` structure is defined as:

    typedef struct VkPhysicalDeviceRayTracingPropertiesNV {
        VkStructureType    sType;
        void*              pNext;
        uint32_t           shaderGroupHandleSize;
        uint32_t           maxRecursionDepth;
        uint32_t           maxShaderGroupStride;
        uint32_t           shaderGroupBaseAlignment;
        uint64_t           maxGeometryCount;
        uint64_t           maxInstanceCount;
        uint64_t           maxTriangleCount;
        uint32_t           maxDescriptorSetAccelerationStructures;
    } VkPhysicalDeviceRayTracingPropertiesNV;

## Members

- `sType` is the type of this structure.

- `pNext` is `NULL` or a pointer to an extension-specific structure.

- `shaderGroupHandleSize` size in bytes of the shader header.

- `maxRecursionDepth` is the maximum number of levels of recursion allowed in a trace command.

- `maxShaderGroupStride` is the maximum stride in bytes allowed between shader groups in the SBT.

- `shaderGroupBaseAlignment` is the required alignment in bytes for the base of the SBTs.

- `maxGeometryCount` is the maximum number of geometries in the bottom level acceleration structure.

- `maxInstanceCount` is the maximum number of instances in the top level acceleration structure.

- `maxTriangleCount` is the maximum number of triangles in all geometries in the bottom level acceleration structure.

- `maxDescriptorSetAccelerationStructures` is the maximum number of acceleration structure descriptors that are allowed in a descriptor set.

## Description

If the `VkPhysicalDeviceRayTracingPropertiesNV` structure is included in the `pNext` chain of VkPhysicalDeviceProperties2, it is filled with the implementation-dependent limits.

Limits specified by this structure must match those specified with the same name in VkPhysicalDeviceRayTracingPropertiesKHR.

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_RAY_TRACING_PROPERTIES_NV`

## See Also

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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.