C Specification
The VkPartitionedAccelerationStructureWriteInstanceDataNV structure is defined as:
// Provided by VK_NV_partitioned_acceleration_structure
typedef struct VkPartitionedAccelerationStructureWriteInstanceDataNV {
VkTransformMatrixKHR transform;
float explicitAABB[6];
uint32_t instanceID;
uint32_t instanceMask;
uint32_t instanceContributionToHitGroupIndex;
VkPartitionedAccelerationStructureInstanceFlagsNV instanceFlags;
uint32_t instanceIndex;
uint32_t partitionIndex;
VkDeviceAddress accelerationStructure;
} VkPartitionedAccelerationStructureWriteInstanceDataNV;
Members
-
transform
is a VkTransformMatrixKHR structure describing the transformation to be applied to the instance in PTLAS. -
explicitAABB
specifies an axis aligned bounding box representing the maximum extent of any vertex within the used acceleration structure after applying the instance-to-world transformation. The partition translation is not applied to the bounding box. -
instanceID
is a user specified constant assigned to an instance in the PTLAS. -
instanceMask
is a 8-bit mask assigned to the instance that may be used to include or reject group of instances. -
instanceContributionToHitGroupIndex
is a 24-bit per application specified instance value added in the indexing into the shader binding table to fetch the hit group to use. -
instanceFlags
is a bitmask of VkPartitionedAccelerationStructureInstanceFlagsNV specifying flags an instance in the PTLAS. -
instanceIndex
is the index of the instance within the PTLAS. -
partitionIndex
is the index of the partition to which this instance belongs. Global partitions are referred to byVK_PARTITIONED_ACCELERATION_STRUCTURE_PARTITION_INDEX_GLOBAL_NV
. -
accelerationStructure
is the device address of the bottom level acceleration structure or a clustered bottom level acceleration structure that is being instanced. This instance is disabled if the device address is0
.
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.