Surface Normal Averaging eryar@163.com 摘要Abstract:正确设置网格面上点的法向,对几何体在光照等情况下显示得更真实,这样就可以减少顶点数量,提高渲染速度.本文通过将OpenCascade中的形状离散成网格数据后在OpenSceneGraph中显示,及使用OSG的快速法向osgUtil::SmoothingVisitor优化与使用OpenCascade来计算正确的法向的结果的对比,说明面法向量的重要性. 关键字Key Words:OpenCascade…

Surface Normal Vector in OpenCascade eryar@163.com 摘要Abstract:表面上某一点的法向量(Normal Vector)指的是在该点处与表面垂直的方向.对于平面,其上各点的法向是一样的,统一为这个平面的法向.对于曲面,各点具有不同的法向量.几何对象的法向量定义了它在空间中的方向,法向量是在进行光照处理时的重要参数.所以在显示造型算法离散曲面后的网格时,设置正确的法向量对场景的光照.光线追踪效果有直接影响.本文结合OpenCascade中代码,…

计算过程如下: 1,通过由主角中心raycast一条竖直射线获得主角所在处地面法线,用作主角的newUp. 注:一定要从主角中心raycast,而不要从player.transform.position,因为如果player的模型原点在脚上,则player.transform.position可能就在地面以下了,向下raycast得不到与地面的交点了就. 2,根据主角forward和newUp计算newForward. 3,使用Quaternion.LookRotation (newForwar…

OpenCASCADE Face Normals eryar@163.com Abstract. 要显示一个逼真的三维模型,其顶点坐标.顶点法向.纹理坐标这三个信息必不可少.本文主要介绍如何在OpenCASCADE的Draw中显示出曲面的法向量,通过使用相关命令,来方便地对曲面的法向进行检查. Key Words. Face, Surface, Normals 1. Introduction 曲面上点的法向量对于三维显示程序来说是一个重要的数据,他的正确与否直接影响曲面对光照的反应进而影响显示效…

Milan Ikits University of Utah Joe Kniss University of Utah Aaron Lefohn University of California, Davis Charles Hansen University of Utah This chapter presents texture-based volume rendering techniques that are used for visualizing three-dimensional…

转自:http://www.cnblogs.com/graphics/archive/2009/11/25/1583682.html DirectX 总结 DDS DirectXDraw Surface file format, .dds.这是微软从DirectX7开始引进的一种文件格式,它用来存储压缩的或未压缩的纹理,该格式支持mimaps cube maps和volume maps, D3DX和许多其他的DX工具都支持这种格式,比如DirectX Texture Editor(dxtex.e…

[Game Engine Architecture 10] 1.Full-Screen Antialiasing (FSAA) also known as super-sampled antialiasing (SSAA). the scene is rendered into a frame buffer that is larger than the actual screen. Once rendering of the frame is complete, the resulting o…

Accepted Papers     Title Primary Subject Area ID 3D computer vision 93 UPnP: An optimal O(n) solution to the absolute pose problem with universal applicability 128 Video Registration to SfM Models 168 Image-based 4-d Modeling Using 3-d Change Detect…

@http://www-cs-faculty.stanford.edu/people/karpathy/cvpr2015papers/ CVPR 2015 papers (in nicer format than this) maintained by @karpathy NEW: This year I also embedded the (1,2-gram) tfidf vectors of all papers with t-sne and placed them in an interf…

From:  http://www.pamitc.org/cvpr15/program.php Official Program for CVPR 2015 Monday, June 8 8:30am-8:40am Ballrooms A,B,C Rooms 302,304,306 Opening Remarks from Conference Chairs The opening remarks will be made from Ballrooms A,B,C, but a live vid…