Extension and Version Dependencies
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This is a provisional extension and must be used with caution. See the description of provisional header files for enablement and stability details.
Contact
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Christoph Kubisch pixeljetstream
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Eric Werness ewerness-nv
Other Extension Metadata
- Last Modified Date
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2023-03-17
- Interactions and External Dependencies
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TBD
- Contributors
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Christoph Kubisch, NVIDIA
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Eric Werness, NVIDIA
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Description
Ray tracing can very efficiently render from geometry which has very fine detail, but when using only a basic triangle representation, memory consumption can be an issue. This extension adds the ability to add a displacement map to add more detail to triangles in an acceleration structure with an efficient in-memory format. The format is externally visible to allow the application to compress its internal geometry representations into the compressed format ahead of time. This format adds displacements along a defined vector to subtriangle vertices which are subdivided from the main triangles.
This extension provides:
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a new VkMicromapTypeEXT format for the displacement micromap,
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a structure to extend VkAccelerationStructureGeometryTrianglesDataKHR to attach a displacement micromap to the geometry of the acceleration structure,
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enums extending VkBuildAccelerationStructureFlagBitsKHR to allow for updates.
New Structures
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Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
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Extending VkPhysicalDeviceProperties2:
New Enum Constants
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VK_NV_DISPLACEMENT_MICROMAP_EXTENSION_NAME -
VK_NV_DISPLACEMENT_MICROMAP_SPEC_VERSION -
Extending VkBuildAccelerationStructureFlagBitsKHR:
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VK_BUILD_ACCELERATION_STRUCTURE_ALLOW_DISPLACEMENT_MICROMAP_UPDATE_NV
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Extending VkMicromapTypeEXT:
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VK_MICROMAP_TYPE_DISPLACEMENT_MICROMAP_NV
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Extending VkPipelineCreateFlagBits:
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VK_PIPELINE_CREATE_RAY_TRACING_DISPLACEMENT_MICROMAP_BIT_NV
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_ACCELERATION_STRUCTURE_TRIANGLES_DISPLACEMENT_MICROMAP_NV -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DISPLACEMENT_MICROMAP_FEATURES_NV -
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DISPLACEMENT_MICROMAP_PROPERTIES_NV
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Issues
(1) What is the status of this extension?
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Provisional and expected to change. The broad structure and encoding format are stable, but there will likely be changes to the structures, enumerant values, and shader interface.
Version History
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Revision 1, 2023-03-17 (Eric Werness)
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Initial public revision
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Revision 2, 2023-07-07 (Eric Werness)
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Add shader support for decode intrinsics
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Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.