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By the procedure, we first use the cosine values of the angle between view vector and normal vector on each vertex as the texture coordinates, through calculation of the dot product of the two vectors. The derivative of radial curvature on the model surface is used as the second pass texture mapping coordinates, by a calculation using Euler formula.

该方法首先通过模型顶点的视线向量和法线向量的点乘积计算其夹角的余弦值,作为第一步的纹理坐标进行映射;再通过欧拉公式计算径向曲率及其方向导数值,作为第二步映射的纹理坐标

In view of the demand of computerized eye-glasses-wearing system, an approach to match two dimensional (2D) human head images with 3D glasses frame graphics in 3D space has been proposed. First, the operator points out three or six key points, which are used to locate 3D eye-glasses frame, on the human face image displayed on the computer screen interactively.

论文针对计算机化眼镜配戴系统的要求,提出了一种在三维空间匹配二维人头图象和三维眼镜图形的方法,即通过人机交互方法,由操作者在显示于计算机屏幕上的二维人头图象上,指出确定三维眼镜位置的三个或六个关键点的二维坐标及其三维对应点,从而可以近似求出人面朝向及视点坐标,再用相应位置上的三维通用人头图形替换二维人面图象,计算人面和眼镜间的遮挡关系并显示,从而完成二者的空间匹配。

Remember that the z-coordinate is negative because OpenGVS uses the same right handed coordinate system to remain compatible with OpenGL (remember,+Z is out of the screen toward the eyepoint, so we are conceptually moving our sample object "into the screen" away from the eyepoint so we can see it).

记住Z坐标是相反的,因为OpenGVS用一样的右手坐标系统去保留对OpenGL的兼容(记住,+Z从银幕而出指向眼睛的,所以我们观念性的移动我们的例子,使之背离眼睛进入荧幕,所以我们能看见它)。

This paper discussed the coordinate transformation method of WGS84 coordinate system to 1954-BeiJing Gauss grid coordinate. Introduced transformation model of WGS84 to Beijing 54 and computing method of transformation parameter. According to different model and computing method, computed and compared with the result combine real data. Think that adopt base-line vector quantity ask four parameters model have higher transformation precision.

本文详细讨论了WGS84大地坐标转换到北京54坐标系下的高斯平面坐标的方法,重点介绍了WGS84和北京54的空间直角坐标的转换模型及转换参数的计算方法,并根据不同的模型和计算方法结合实际数据进行计算和结果的比较,认为采用基线向量求解的四参数模型具有较高的转换精度,分区变换和提高控制点精度也能提高转换的精度。

When the vehicle vibrates, the ratio coefficients of the characteristics of components in fixed position and the corresponding characteristics of suspension are a function of generalized coordinates.

车辆振动过程中,实际安装位置的元件特性与悬挂特性的比例系数是广义坐标的函数。为了使数学模型尽量接近实际情况,本文导出了此比例系数与广义坐标的关系。

Since the number of generalized coordinates is large when using the finite elemen

因为用有限元离散时,柔性薄板的广义坐标规模较大,故仿真计算需要时间较长,所以模态截断法被用来缩减广义坐标数量,提高计算效率。

Taking generalized coordinates for variables, the differential equations of multiple elastic particles are decomposed into the differential equations in the independent form by introducing generalized coordinates .

通过广义坐标的引入,将多质点弹性体系的运动微分方程分解成以广义坐标为变量的独立微分方程形式。

The main problem of the mode synthesis method , applied in structural vibration analysis of prefabricated bridges, is how to select relevant number of low frequency modes synthesized during the course that displacements of substructures are expressed in generalized coordinates that are defined by displacement modes.

模态综合法应用于装配式桥梁结构振动分析的主要问题,是在将子结构坐标缩聚为模态广义坐标的过程中,如何选取适当数目的低阶模态来参与综合。

Since the number of generalized coordinates is large when using the finite element method, MTA is usually used for improving computational efficiency and only lower-order modes are chosen.

因为用有限元离散时,柔性薄板的广义坐标规模较大,故仿真计算需要时间较长,所以模态截断法被用来缩减广义坐标数量,提高计算效率。

It is important that the longitude and latitude that you supply are geographic coordinates, not geocentric coordinates.

你需要提供的是地理坐标而不是地心坐标,这个很重要。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。