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    RENDERING ALONG A SPACE-FILLING CURVE
    2.
    发明公开
    RENDERING ALONG A SPACE-FILLING CURVE 审中-公开

    公开(公告)号：US20230419450A1

    公开(公告)日：2023-12-28

    申请号：US18076954

    申请日：2022-12-07

    Applicant: NVIDIA Corporation

    Inventor： Alexander Georg Keller ,  Carsten Alexander Waechter ,  Nikolaus Binder

    IPC: G06T5/00 ,  G06T1/20 ,  G06T7/90 ,  G06T11/40

    CPC classification number: G06T5/002 ,  G06T1/20 ,  G06T7/90 ,  G06T11/40 ,  G06T2207/20084 ,  G06T2207/20081

    Abstract: In photorealistic image synthesis by light transport simulation, the colors of each pixel are an integral of a high-dimensional function. However, the functions to integrate contain discontinuities that cannot be predicted efficiently. In practice, the pixel colors are estimated by using Monte Carlo and quasi-Monte Carlo methods to sample light transport paths that connect light sources and cameras and summing up the contributions to evaluate an integral. Because of the sampling, images appear noisy when the number of samples is insufficient. A low discrepancy sequence provides sample locations and these sample locations can be enumerated (assigned or distributed to pixels) according to a space-filling curve superimposed on a pixel grid. Correlations of such combinations of space-filling curves and low discrepancy sequences are analyzed, and the presented algorithms reduce correlations, are deterministic, and may be executed for each pixel in parallel.

    RAY OFFSETTING FOR NUMERICAL IMPRECISION COMPENSATION IN CONTENT GENERATION SYSTEMS AND APPLICATIONS
    5.
    发明申请
    RAY OFFSETTING FOR NUMERICAL IMPRECISION COMPENSATION IN CONTENT GENERATION SYSTEMS AND APPLICATIONS 有权

    公开(公告)号：US20240371073A1

    公开(公告)日：2024-11-07

    申请号：US18597392

    申请日：2024-03-06

    Applicant: Nvidia Corporation

    Inventor： Dirk Gerrit van Antwerpen ,  Carsten Alexander Waechter ,  Oliver Klehm

    IPC: G06T15/06

    Abstract: Approaches presented herein provide for the reduction in artifacts in image data rendered using ray or path tracing, such as may be due to self-intersections with scene geometry. In at least one embodiment, an appropriate offset value is automatically determined that is to be applied to the spawn point of a secondary ray to be traced, such as may correspond to a hit point of an incoming ray on scene geometry. In at least one embodiment, a single offset value can be calculated that accounts for all sources of numerical error in both construction of the spawn point and during ray traversal, including sources of error in both object space and world space. Once calculated, this single offset can be applied along a normal of a scene geometry, so that any ray traced from a shifted spawn point will not self-intersect the triangle, even for edge or corner cases.

    RANK-1 LATTICE SAMPLING
    6.
    发明公开
    RANK-1 LATTICE SAMPLING 审中-公开

    公开(公告)号：US20240354912A1

    公开(公告)日：2024-10-24

    申请号：US18760184

    申请日：2024-07-01

    Applicant: NVIDIA Corporation

    Inventor： Alexander Georg Keller ,  Carsten Alexander Waechter ,  Nikolaus Binder

    IPC: G06T5/77 ,  G06T11/00

    CPC classification number: G06T5/77 ,  G06T11/001 ,  G06T2207/10024 ,  G06T2207/20084

    Abstract: In photorealistic image synthesis by light transport simulation, the colors of each pixel are an integral of a high-dimensional function. However, the functions to integrate contain discontinuities that cannot be predicted efficiently. In practice, the pixel colors are estimated by using Monte Carlo and quasi-Monte Carlo methods to sample light transport paths that connect light sources and cameras and summing up the contributions to evaluate an integral. Because of the sampling, images appear noisy when the number of samples is insufficient. A rank-1 lattice sequence provides sample locations and these sample locations can be enumerated (assigned or distributed to pixels) according to a space-filling curve superimposed on a pixel grid. Combinations of space-filling curves and rank-1 lattice sequences reduce correlations, are deterministic, and may be executed for each pixel in parallel. The rank-1 lattice sequence enables real-time light transport simulation, producing high visual quality even for low sampling rates.

    CONSISTENT SAMPLING FOR SPATIAL HASHING
    7.
    发明公开
    CONSISTENT SAMPLING FOR SPATIAL HASHING 审中-公开

    公开(公告)号：US20230169721A1

    公开(公告)日：2023-06-01

    申请号：US17536531

    申请日：2021-11-29

    Applicant: Nvidia Corporation

    Inventor： Pascal Albert Gautron ,  Carsten Alexander Waechter

    IPC: G06T15/50 ,  G06T15/06

    CPC classification number: G06T15/506 ,  G06T15/06

    Abstract: Approaches presented herein reduce the presence of temporary artifacts such, as flickering, when using spatial hashing with simulation. Flickering can be avoided, at least in part, by ensuring that the same simulation points are utilized in separate executions of an algorithm, even where the execution order can vary. This can involve selecting a single representative point for each hash cell of a spatial hash map, where simulation for that hash cell will be performed for that representative point location, regardless of execution order. Both a location index and a selector value are stored for this hash map entry in a single value, where lower bits store the location index and higher bits represent the selector value. Storing the selector value in the higher-weight bits ensures an atomic maximum operation will primarily consider the selector value, and resort to the location index only in the event of equal selector values.

    LIGHTING SIMULATION ANALYSIS USING LIGHT PATH EXPRESSIONS
    10.
    发明申请
    LIGHTING SIMULATION ANALYSIS USING LIGHT PATH EXPRESSIONS 有权
    使用光路表示的照明模拟分析

    公开(公告)号：US20160042559A1

    公开(公告)日：2016-02-11

    申请号：US14820491

    申请日：2015-08-06

    Applicant: NVIDIA Corporation

    Inventor： Daniel Johannes Seibert ,  Stefan Radig ,  Matthias Raab ,  Carsten Alexander Waechter ,  Lutz Kettner ,  Alexander Keller ,  Dirk Gerrit van Antwerpen

    IPC: G06T15/50 ,  G06T15/06 ,  G06T17/00

    CPC classification number: G06T15/506 ,  G06T15/06 ,  G06T15/55 ,  G06T2210/04

    Abstract: A method, system, and computer program product for performing a lighting simulation are disclosed. The method includes the steps of receiving a three-dimensional (3D) model, receiving a set of probes, where each probe specifies a location within the 3D model and an orientation of the probe, and performing, via a processor, a lighting simulation based on the 3D model, the set of probes, and one or more light path expressions. The light path expressions are regular expressions that represent a series of events, each event representing an interaction of a ray at a location in the 3D model.

    Abstract translation: 公开了一种用于执行照明模拟的方法，系统和计算机程序产品。 该方法包括以下步骤：接收三维（3D）模型，接收一组探针，其中每个探针指定3D模型内的位置和探针的取向，以及经由处理器执行基于照明模拟 在3D模型上，探针组和一个或多个光路表达式。 光路表达式是表示一系列事件的正则表达式，每个事件表示3D模型中某个位置的光线相互作用。

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