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Raytraced Motion Blur in Vulkan

Motion Blur Demonstration

Overview

This sample demonstrates three motion blur methods in Vulkan raytracing: Matrix, SRT, and Object.

Implementation Details

Extension Requirements

  • Enable VK_NV_ray_tracing_motion_blur
  • Set rayTracingMotionBlur to true in VkPhysicalDeviceRayTracingMotionBlurFeaturesNV

Top-Level Acceleration Structure (TLAS)

  • Use VkAccelerationStructureMotionInstanceNV with padding for 160-byte stride
  • Define MATRIX and SRT motion
  • Specify transformations at time 0 and 1
  • Mark static objects with VK_ACCELERATION_STRUCTURE_MOTION_INSTANCE_TYPE_STATIC_NV

Bottom-Level Acceleration Structure (BLAS)

  • For object deformation, use VkAccelerationStructureGeometryMotionTrianglesDataNV
  • Reference objects at time 0 and 1

Pipeline Configuration

  • Set VK_PIPELINE_CREATE_RAY_TRACING_ALLOW_MOTION_BIT_NV flag in VkRayTracingPipelineCreateInfoKHR

Shader Implementation

  • Use traceRayMotionNV for time-specific ray tracing
  • Require GL_NV_ray_tracing_motion_blur extension

Code References

Search for #NV_Motion_blur in the source code for specific implementations.

Key Functions

  • createTopLevelAS(): TLAS setup with motion data
  • createBottomLevelAS(): BLAS configuration for deformation

Technical Considerations

  • Linear interpolation of transformations in shaders
  • Performance impact of motion blur on raytracing
  • Balancing motion blur quality and computational cost