# VkAccelerationStructureGeometryTrianglesDataKHR(3) Manual Page

## Name

VkAccelerationStructureGeometryTrianglesDataKHR - Structure specifying a triangle geometry in a bottom-level acceleration structure

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## C Specification

The `VkAccelerationStructureGeometryTrianglesDataKHR` structure is defined as:

    // Provided by VK_KHR_acceleration_structure
    typedef struct VkAccelerationStructureGeometryTrianglesDataKHR {
        VkStructureType                  sType;
        const void*                      pNext;
        VkFormat                         vertexFormat;
        VkDeviceOrHostAddressConstKHR    vertexData;
        VkDeviceSize                     vertexStride;
        uint32_t                         maxVertex;
        VkIndexType                      indexType;
        VkDeviceOrHostAddressConstKHR    indexData;
        VkDeviceOrHostAddressConstKHR    transformData;
    } VkAccelerationStructureGeometryTrianglesDataKHR;

## 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 vertex element.

- `vertexData` is a device or host address to memory containing vertex data for this geometry.

- `vertexStride` is the stride in bytes between each vertex.

- `maxVertex` is the number of vertices in `vertexData` minus one.

- `indexType` is the VkIndexType of each index element.

- `indexData` is a device or host address to memory containing index data for this geometry.

- `transformData` is a device or host address to memory containing an optional reference to a VkTransformMatrixKHR structure describing a transformation from the space in which the vertices in this geometry are described to the space in which the acceleration structure is defined.

## Description

Note | Unlike the stride for vertex buffers in VkVertexInputBindingDescription for graphics pipelines which must not exceed `maxVertexInputBindingStride`, `vertexStride` for acceleration structure geometry is instead restricted to being a 32-bit value.

Valid Usage

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-vertexStride-03735
  `vertexStride` must be a multiple of the size in bytes of the smallest component of `vertexFormat`

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-vertexStride-03819
  `vertexStride` must be less than or equal to 232-1

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-vertexFormat-03797
  The format features of `vertexFormat` must contain `VK_FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR`

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-indexType-03798
  `indexType` must be `VK_INDEX_TYPE_UINT16`, `VK_INDEX_TYPE_UINT32`, or `VK_INDEX_TYPE_NONE_KHR`

Valid Usage (Implicit)

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_TRIANGLES_DATA_KHR`

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-pNext-pNext
  Each `pNext` member of any structure (including this one) in the `pNext` chain must be either `NULL` or a pointer to a valid instance of VkAccelerationStructureGeometryMotionTrianglesDataNV, VkAccelerationStructureTrianglesDisplacementMicromapNV, or VkAccelerationStructureTrianglesOpacityMicromapEXT

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-sType-unique
  The `sType` value of each structure in the `pNext` chain must be unique

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-vertexFormat-parameter
  `vertexFormat` must be a valid VkFormat value

- VUID-VkAccelerationStructureGeometryTrianglesDataKHR-indexType-parameter
  `indexType` must be a valid VkIndexType value

## See Also

VK_KHR_acceleration_structure, VkAccelerationStructureGeometryDataKHR, VkDeviceOrHostAddressConstKHR, VkDeviceSize, VkFormat, VkIndexType, 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0