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    Bidirectional point distribution functions for rendering granular media
    1.
    发明授权
    Bidirectional point distribution functions for rendering granular media 有权
    用于渲染粒度介质的双向点分布函数

    公开(公告)号：US09472016B2

    公开(公告)日：2016-10-18

    申请号：US13842204

    申请日：2013-03-15

    申请人： Wojciech Jarosz ,  Johannes Meng ,  Marios Papas ,  Ralf Habel ,  Carsten Dachsbacher ,  Steve Marschner

    发明人： Wojciech Jarosz ,  Johannes Meng ,  Marios Papas ,  Ralf Habel ,  Carsten Dachsbacher ,  Steve Marschner

    IPC分类号： G06T15/06 ,  G06T15/50

    CPC分类号： G06T15/06 ,  G06T15/506

    摘要： The disclosure provides an approach for rendering granular media. According to one aspect of the disclosure, granular media are rendered using bidirectional point scattering distribution functions (BPSDFs). The dimensionality of BPSDFs may be reduced by making certain assumptions, such as random orientations of grains, thereby simplifying light transport for computational efficiency. To generate a BPSDF from a grain, light transport may be precomputed using a Monte Carlo simulation in which photons are shot onto the grain from all directions. The precomputed BPSDF may be used, during rendering, for describing the interactions within grains. When a light ray traced during rendering intersects proxy geometry which replaces grain geometry, the BPSDF may be evaluated to determine light transport. By repeating this process for many light rays in a Monte Carlo simulation, the light propagation through the granular medium may be determined.

    摘要翻译： 本公开提供了一种用于渲染粒状介质的方法。 根据本公开的一个方面，使用双向点散射分布函数（BPSDF）渲染粒状介质。 可以通过做出某些假设来减少BPSDF的维数，诸如颗粒的随机取向，从而简化了光传输的计算效率。 为了从颗粒生成BPSDF，可以使用蒙特卡罗模拟预先计算光传输，其中光子从所有方向被射击到颗粒上。 在渲染期间可以使用预先计算的BPSDF来描述谷物内的相互作用。 当渲染期间跟踪的光线与替代晶粒几何的代理几何相交时，可以评估BPSDF以确定光传输。 通过在蒙特卡洛模拟中对于许多光线重复该过程，可以确定通过粒状介质的光传播。

    METHOD OF FABRICATING TRANSLUCENT MATERIALS WITH DESIRED APPEARANCE
    3.
    发明申请
    METHOD OF FABRICATING TRANSLUCENT MATERIALS WITH DESIRED APPEARANCE 有权
    具有预期外观的制造透明材料的方法

    公开(公告)号：US20140198204A1

    公开(公告)日：2014-07-17

    申请号：US13935712

    申请日：2013-07-05

    申请人： Marios Papas ,  Christian Regg ,  Steve Marschner ,  Wojciech Jarosz ,  Wojciech Matusik ,  Philip J. Jackson ,  Bernd Bickel

    发明人： Marios Papas ,  Christian Regg ,  Steve Marschner ,  Wojciech Jarosz ,  Wojciech Matusik ,  Philip J. Jackson ,  Bernd Bickel

    IPC分类号： G01N21/47

    CPC分类号： G01N21/4738 ,  Y10T428/24942

    摘要： A method for creating a replication material corresponding to the appearance of a translucent or partially translucent target material. The appearance of the target material can be measured or may be prescribed by a user. The method includes receiving by a processor optical data related to a target subsurface scattering parameter of the target material. Once the processor has received the optical or light characteristic data, the method includes determining by the processor a replication pigment concentration to replicate the appearance of the target material caused by the target subsurface scattering parameter. The processor determines this concentration based on a plurality of pigment subsurface scattering parameters corresponding to a plurality of stored pigment concentrations in the computing device. Once the replication pigment concentration has been determined, the method includes creating, physically or virtually, the replication material by combining the pigment concentration with a base material.

    摘要翻译： 一种用于创建对应于半透明或部分半透明的目标材料的外观的复制材料的方法。 可以测量目标材料的外观，或者可以由用户规定。 该方法包括由处理器接收与目标材料的目标地下散射参数有关的光学数据。 一旦处理器接收到光学或光特性数据，该方法包括由处理器确定复制颜料浓度以复制由目标地下散射参数引起的目标材料的外观。 处理器基于对应于计算设备中多个储存的颜料浓度的多个颜料地下散射参数来确定该浓度。 一旦确定了复制颜料浓度，该方法包括通过将颜料浓度与基材组合来物理或虚拟地复制复制材料。