Vulkan.Extensions.VK_NV_ray_tracing_linear_swept_spheres

VkAccelerationStructureGeometryLinearSweptSpheresDataNV - Structure specifying a LSS geometry in a bottom-level acceleration structure

Description

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

Valid Usage

• The linearSweptSpheres feature must be enabled

• vertexStride must be a multiple of:

  • the size of the format specified in vertexFormat if that format is a packed format

  • the component size specified in vertexFormat if that format is not a packed format

• vertexStride and radiusStride must be less than or equal to 232-1

• The format features of vertexFormat must contain FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR

• The format features of radiusFormat must contain FORMAT_FEATURE_2_ACCELERATION_STRUCTURE_RADIUS_BUFFER_BIT_NV

• All values referenced in radiusData must be greater than or equal to 0

• If indexingMode is RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV, indexData must not be NULL

• indexType must be INDEX_TYPE_UINT16, INDEX_TYPE_UINT32, or INDEX_TYPE_NONE_KHR

Valid Usage (Implicit)

• sType must be STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_LINEAR_SWEPT_SPHERES_DATA_NV

• vertexFormat must be a valid Format value

• vertexData must be a valid DeviceOrHostAddressConstKHR union

• radiusFormat must be a valid Format value

• radiusData must be a valid DeviceOrHostAddressConstKHR union

• indexType must be a valid IndexType value

• indexData must be a valid DeviceOrHostAddressConstKHR union

• indexingMode must be a valid RayTracingLssIndexingModeNV value

• endCapsMode must be a valid RayTracingLssPrimitiveEndCapsModeNV value

Structure Chaining

Extends the structure

• AccelerationStructureGeometryKHR

See Also

VK_NV_ray_tracing_linear_swept_spheres, DeviceOrHostAddressConstKHR, DeviceSize, Format, IndexType, RayTracingLssIndexingModeNV, RayTracingLssPrimitiveEndCapsModeNV, StructureType

VkAccelerationStructureGeometrySpheresDataNV - Structure specifying a sphere geometry in a bottom-level acceleration structure

Valid Usage

• The spheres feature must be enabled

• vertexStride must be a multiple of:

  • the size of the format specified in vertexFormat if that format is a packed format

  • the smallest component size specified in vertexFormat if that format is not a packed format

• vertexStride and radiusStride must be less than or equal to 232-1

• The format features of vertexFormat must contain FORMAT_FEATURE_ACCELERATION_STRUCTURE_VERTEX_BUFFER_BIT_KHR

• The format features of radiusFormat must contain FORMAT_FEATURE_2_ACCELERATION_STRUCTURE_RADIUS_BUFFER_BIT_NV

• All values referenced in radiusData must be greater than or equal to 0

• indexType must be INDEX_TYPE_UINT16, INDEX_TYPE_UINT32, INDEX_TYPE_NONE_KHR

Valid Usage (Implicit)

• sType must be STRUCTURE_TYPE_ACCELERATION_STRUCTURE_GEOMETRY_SPHERES_DATA_NV

• vertexFormat must be a valid Format value

• vertexData must be a valid DeviceOrHostAddressConstKHR union

• radiusFormat must be a valid Format value

• radiusData must be a valid DeviceOrHostAddressConstKHR union

• indexType must be a valid IndexType value

• indexData must be a valid DeviceOrHostAddressConstKHR union

Structure Chaining

Extends the structure

• AccelerationStructureGeometryKHR

See Also

VK_NV_ray_tracing_linear_swept_spheres, DeviceOrHostAddressConstKHR, DeviceSize, Format, IndexType, StructureType

VkPhysicalDeviceRayTracingLinearSweptSpheresFeaturesNV - Structure describing the ray tracing linear swept spheres features that can be supported by an implementation

Members

This structure describes the following features:

Description

If the PhysicalDeviceRayTracingLinearSweptSpheresFeaturesNV structure is included in the pNext chain of the PhysicalDeviceFeatures2 structure passed to getPhysicalDeviceFeatures2, it is filled in to indicate whether each corresponding feature is supported. If the application wishes to use a Device with any features described by PhysicalDeviceRayTracingLinearSweptSpheresFeaturesNV, it must add an instance of the structure, with the desired feature members set to TRUE, to the pNext chain of DeviceCreateInfo when creating the Device.

Structure Chaining

Extends the structures

• DeviceCreateInfo

• PhysicalDeviceFeatures2

See Also

VK_NV_ray_tracing_linear_swept_spheres, Bool32, StructureType

VkRayTracingLssIndexingModeNV - LSS indexing mode

Description

• RAY_TRACING_LSS_INDEXING_MODE_LIST_NV specifies that a list of indices is provided where each consecutive pair of indices define a LSS primitive.

• RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV specifies a successive implicit indexing format, in which each LSS primitive is defined by two successive positions and radii, (k, k + 1), where k is a single index provided in the index buffer. In this indexing scheme, there is a 1:1 mapping between the index buffer and primitive index within the geometry.

See Also

VK_NV_ray_tracing_linear_swept_spheres, AccelerationStructureGeometryLinearSweptSpheresDataNV

VkRayTracingLssPrimitiveEndCapsModeNV - LSS endcaps mode

Description

• RAY_TRACING_LSS_PRIMITIVE_END_CAPS_MODE_NONE_NV disables all endcaps and the chain boundaries have no influence.

• RAY_TRACING_LSS_PRIMITIVE_END_CAPS_MODE_CHAINED_NV specifies that when RAY_TRACING_LSS_INDEXING_MODE_SUCCESSIVE_NV is used as indexing mode for the LSS primitive, the first primitive in each chain will have both endcaps enabled, and every following primitive in the chain only has endcaps at the trailing position enabled.

See Also

VK_NV_ray_tracing_linear_swept_spheres, AccelerationStructureGeometryLinearSweptSpheresDataNV

VkGeometryTypeKHR - Enum specifying which type of geometry is provided

Description

• GEOMETRY_TYPE_TRIANGLES_KHR specifies a geometry type consisting of triangles.

• GEOMETRY_TYPE_AABBS_KHR specifies a geometry type consisting of axis-aligned bounding boxes.

• GEOMETRY_TYPE_INSTANCES_KHR specifies a geometry type consisting of acceleration structure instances.

• GEOMETRY_TYPE_DENSE_GEOMETRY_FORMAT_TRIANGLES_AMDX specifies a geometry type consisting of triangles from compressed data.

• GEOMETRY_TYPE_SPHERES_NV specifies a geometry type consisting of spheres.

• GEOMETRY_TYPE_LINEAR_SWEPT_SPHERES_NV specifies a geometry type consisting of linear swept spheres.

• VK_GEOMETRY_TYPE_MICROMAP_KHR specifies a geometry type consisting of a micromap array.

See Also

VK_KHR_acceleration_structure, VK_NV_ray_tracing, AccelerationStructureGeometryKHR, GeometryNV