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Abstract:
Opticks is an open source project that brings NVIDIA OptiX ray tracing to existing Geant4 toolkit based simulations. Advantages of separate optical photon simulation and the approaches developed to integrate it with the general Geant4 particle simulation are presented. Approaches to minimize overheads arising from split are shown. Challenges included bringing complex CSG geometries with wavelength dependent material and surface properties to the GPU. Techniques for visualisation of photon propagations with interactive time scrubbing and history selection using OpenGL/OptiX/Thrust interop and geometry shaders are described. Results and demonstrations are shown for the photomultiplier based Daya Bay and JUNO Neutrino detectors.
Opticks is an open source project that brings NVIDIA OptiX ray tracing to existing Geant4 toolkit based simulations. Advantages of separate optical photon simulation and the approaches developed to integrate it with the general Geant4 particle simulation are presented. Approaches to minimize overheads arising from split are shown. Challenges included bringing complex CSG geometries with wavelength dependent material and surface properties to the GPU. Techniques for visualisation of photon propagations with interactive time scrubbing and history selection using OpenGL/OptiX/Thrust interop and geometry shaders are described. Results and demonstrations are shown for the photomultiplier based Daya Bay and JUNO Neutrino detectors.  Back
 
Topics:
Computational Physics, In-Situ & Scientific Visualization, Rendering & Ray Tracing
Type:
Talk
Event:
GTC Silicon Valley
Year:
2016
Session ID:
S6320
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Abstract:
Optick 是基于 NVIDIA OptiX 和 Geant4 toolkit 开发的开源模拟软件。计算机工作站 GPU 上的测试表明: Opticks 拥有强大的并行计算能力,可以将 CPU 上的 Geant4 光子模拟速度提高 1000 倍以上。拥有 Turing 架构的 NVIDIA RTX 处理器可以针对 ray tracing 进行硬件级别的加速,使得模拟速度进一步提高 6 倍以上。Geant4 模拟包括光子散射、吸收、和重发射等物理过程,这些作用过程在 Opticks 中都利用 CUDA 进行了重新设计和实现。材料的光学属性依赖于光子的波长。这些光学属性基于 GPU texture 实现了快速的插值和抽样方法。此外,Opticks 软件可以把 GPU ray tracing 使用的复杂 CSG 几何(Constructive Solid Geometry)自动转换成 Geant4 模拟使用的几何,并且保证两种模拟使用完全一致的几何描述。
Optick 是基于 NVIDIA OptiX 和 Geant4 toolkit 开发的开源模拟软件。计算机工作站 GPU 上的测试表明: Opticks 拥有强大的并行计算能力,可以将 CPU 上的 Geant4 光子模拟速度提高 1000 倍以上。拥有 Turing 架构的 NVIDIA RTX 处理器可以针对 ray tracing 进行硬件级别的加速,使得模拟速度进一步提高 6 倍以上。Geant4 模拟包括光子散射、吸收、和重发射等物理过程,这些作用过程在 Opticks 中都利用 CUDA 进行了重新设计和实现。材料的光学属性依赖于光子的波长。这些光学属性基于 GPU texture 实现了快速的插值和抽样方法。此外,Opticks 软件可以把 GPU ray tracing 使用的复杂 CSG 几何(Constructive Solid Geometry)自动转换成 Geant4 模拟使用的几何,并且保证两种模拟使用完全一致的几何描述。  Back
 
Topics:
HPC and Supercomputing
Type:
Talk
Event:
GTC China
Year:
2019
Session ID:
CN9894
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