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Calculation method of model surface normal

A technology of surface normal and calculation method, applied in the field of computer graphics, can solve problems such as insufficient smoothness, and achieve the effect of eliminating uneven transition and small contrast.

Active Publication Date: 2018-04-06
WUXI FANTIAN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the surface normal of the calculated model uses the surface normal to represent the normal direction of each point. This method cannot make the model better present its surface shape. If the solid model is drawn using this surface normal, then The brightness of this surface is the same, resulting in the lack of smoothness when connecting each surface, and the entire object model looks like a scaly effect

Method used

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  • Calculation method of model surface normal
  • Calculation method of model surface normal
  • Calculation method of model surface normal

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Embodiment Construction

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0040] A method for calculating the surface normal of a model. For a triangular network model with multiple triangles splicing to describe the surface structure of an object, GPU rasterization is performed, that is, each vertex and pixel are interpolated and converted into the position and method of the pixel. Line information, then calculating the normal direction of each pixel can obtain the lighting information of the model surface,

[0041] The direction of calculating the normal of each pixel is divided into two cases;

[0042] The first case: perform normal calculation on a model without a normal map;

[0043] Case 2: Calculate the model normals with a normal map.

[004...

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Abstract

The invention discloses a method for calculating the surface normal of a model. For a triangle network model with a plurality of triangles spliced ​​to describe the surface structure of an object, after GPU rasterization, each vertex and pixel is interpolated and converted into pixels The position and normal information of each pixel can be calculated by calculating the normal direction of each pixel to obtain the illumination information of the model surface. The calculation of the normal direction of each pixel is divided into two cases; the first case: without The model with the normal map performs normal calculation; the second case: calculates the normal of the model with the normal map. The purpose of eliminating the uneven transition of the model surface and the small contrast is achieved.

Description

technical field [0001] The invention relates to the field of computer graphics, in particular to a method for calculating the surface normal of a model. Background technique [0002] With the continuous development of computer graphics, it is all-encompassing and has a wide range of sources, including virtual reality, scientific research, 3D animation, military simulation and entertainment. Due to the wide application and popularity of special effects in video games and movies, computer graphics is gaining more and more attention. Despite the continuous development of technology, some basic principles and methods of computer graphics remain stable and coherent. In the virtual three-dimensional world, 3D modeling software is used to shape the geometric shape. These models generally do not contain surface normal information, and the normal information has a great effect on the model drawing of the entity. At present, the surface vertex normals of the model are calculated. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/00G06T17/00
Inventor 张翼
Owner WUXI FANTIAN INFORMATION TECH