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Point cloud based method for calculating emergent irradiance of sub-surface scattering object

A technology of subsurface scattering and calculation method, which is applied in the direction of calculation, 3D image processing, and details related to 3D image data, etc. It can solve the problems of complex storage and high cost of irradiance pre-computation processing to achieve fast rendering and improve efficiency , Guarantee the effect of rendering quality

Inactive Publication Date: 2016-04-13
SHANDONG UNIV
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Problems solved by technology

[0008] Aiming at the problems of high cost of irradiance pre-computation processing and complicated storage in the pre-calculation-based subsurface scattering method, the present invention provides a method for calculating the outgoing irradiance of subsurface scattering objects based on point clouds

Method used

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  • Point cloud based method for calculating emergent irradiance of sub-surface scattering object
  • Point cloud based method for calculating emergent irradiance of sub-surface scattering object
  • Point cloud based method for calculating emergent irradiance of sub-surface scattering object

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

[0029] figure 1 It is a flow chart of the method for calculating the outgoing irradiance of a subsurface scattering object based on a point cloud of the present invention. According to this figure, it can be seen that the method of the present invention includes a preprocessing step and a rendering step.

[0030] (1) Preprocessing step

[0031] The surface of the subsurface scattering object is sampled, and then the sampling points on the surface of the subsurface scattering object are directly illuminated to form point cloud sampling points, and the point cloud sampling points are organized into a point cloud tree for storage.

[0032] In this step, the REYES algorithm is used to perform interpolation sampling on the surface of the subsurface scattering object. The point cloud tree adopts a K-D tree structure.

[0033] This embodiment uses a binary tree ...

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Abstract

The invention discloses a point cloud based method for calculating emergent irradiance of a sub-surface scattering object. The method comprises the steps of (1): sampling the surface of the sub-surface scattering object, then performing direct illumination calculation on a sampling point on the surface of the sub-surface scattering object to form a point cloud sampling point, and organizing the point cloud sampling point into a point cloud tree for storage; and (2): performing a light ray tracing and rendering process for rendering, wherein a cross point of each light ray and a scene containing a plurality of three-dimensional objects is a coloring point; when the coloring point falls on the sub-surface scattering object, traversing the point cloud tree to obtain a tree cut associated with the emergent irradiance of the current coloring point, performing integration on the incident irradiance of the current coloring point by each node on the tree cut, and performing calculation according to a sub-surface scattering function to obtain the emergent irradiance of the current coloring point in any direction.

Description

technical field [0001] The invention relates to subsurface scattering realistic rendering, in particular to a method for calculating the outgoing irradiance of a subsurface scattering object based on a point cloud. Background technique [0002] Subsurface scattering refers to the light transmission process in which light enters the object from a certain point on the surface of the object, is scattered internally, and finally exits from other vertices on the surface of the object. Objects with subsurface scattering properties generally have a more rounded appearance and color. This phenomenon is more obvious on translucent materials. Milk, jade, marble, and biological epidermis in the real world all have this property. Subsurface scattering generally needs to be described by a bidirectional surface scattering reflection distribution function (BSSRDF), and drawn by a global illumination algorithm. Therefore, the simulation of subsurface scattering materials has become a very ...

Claims

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Application Information

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IPC IPC(8): G06T15/50
CPCG06T15/50G06T2200/04
Inventor 王璐徐延宁屠长河孟祥旭岳双燕徐安敏
Owner SHANDONG UNIV
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