mongo projection

ArticleDirectory Preface I. 3D mathematical history 2. Matrix Transformation 3. Implementation in OpenGL Iv. Projection Transformation 5. View Transformation Vi. Postscript 7. Reference [OpenGL ES 03] 3D Transformation: model, view, projection, and viewport Luo chaohui (http://www.cnblogs.com/kesalin) This article follows the "signature-non-commercial use-consistency

Original post address: http://blog.csdn.net/popy007/article/details/4091967 In the previous article, we discussed the principle of Perspective Projection Transformation and analyzed the method for generating the Perspective Projection Matrix used by OpenGL. As we said, different graphic APIs cause matrix differences due to differences in the left-right coordinate system, vector column vector matrix, and tr

Principle and Implementation of Perspective Projection AbstractPerspective Projection is the basic concept of 3D rendering and also the basis of 3D programming. Understanding the principle of Perspective Projection plays an important role in understanding other 3D rendering pipelines. This article describes in detail the principle and Algorithm Implementation of

I. Introduction For more information, see http://www.gdal.org/ogr/osr_tutorial.html. OgrspatialreferenceClass andOgrcoordinatetransformationClass is mainly used to provide the definition coordinate system (projection and level) and the conversion coordinate. Both classes are based on the coordinate conversion instructions of OpenGIS and use wellKnown text format to express the coordinate system. Some information about the OpenGIS coordinate system and

OpenGL uses camera simulation to realize the most basic 3D transformations in computer graphics, including geometric transformations, projection transformations, cropping transformations, and viewport transformations. At the same time, OpenGL also implements matrix stacks. Understanding the content of coordinate transformation, even if it truly enters the wonderful 3D world. I,OpenGLDisplay of 3D objects in (1) Coordinate System In the real world, all

Why do we have coordinate projections?The official definition is –The irregular Earth surface can be substituted with the Earth ellipsoid, the earth ellipsoid is an irreducible surface , and the map is a plane that maps the points on the Earth's ellipsoid to the plane, called the map projection. The understanding is that the earth is a ball, and what we want is a plan, and the process of this transformation is like the following: a luminous point shin

Author's introduction : Jesse ClarkPhysicists and data scientists who study phase recovery have extensive experience in building websites and designing mobile applications, and have a great passion for entrepreneurship. Github: https://github.com/jn2clark Linkedin: http://www.linkedin.com/in/j3ss3cl4rk Phase Recovery (PR) The concern is to find the phase [1]of the complex value function (usually in Fourier space) given the amplitude information and constrained by

From: http://blog.csdn.net/fenghuayoushi/article/details/6095043 Generally, the GIS (Geographic Information System, referred to as "geographic information") and surveying and mapping majors in colleges and universities will learn a specialized course-map projection. For trusted students, if they do not have a clear concept of map projection, it is not a rigorous academic attitude to learn other aspects, su

Projection transformation is a key graph transformation. OpenGL only provides two projection modes: normal projection and Perspective Projection. No matter which projection function is called, in order to avoid unnecessary transformations, you must add the following two sent

The master of projection is a working mode, which can be depicted in 2.5D mode on 3D model after entering the model, and then picked up from canvas, this article will detail how to use projection master to draw the replacement details. Before you draw: Be sure to make a large subdivision to the highest level before entering the master projection mode. Step one

The local sensitive hashing algorithm was previously implemented with the R language, but because of its low performance in R, the LSH was discarded for similarity retrieval. Learn python found a lot of modules can be achieved, and by random projection of the forest to make query data faster, think you can try to large-scale application in the data similarity retrieval + deduplication scene. In private, the similarity of text can be divided i

Tags: operator haha emma _id Comm MONGO add reason DirectA simple projectionA little use of mongodb know that the projection is very simple, directlydb.student.find({_id:ObjectId(‘5a5085aed8f10c1a6cc0395b‘)},{comments: 1})Add a $slice projectionHowever, when I want to give comments ( $slice ) How to do it?The wrong approachThe following are the wrong practicesdb.student.find({_id:ObjectId(‘5a5085aed8f10c1a6

In Photoshop, layer usage is the most basic and important editing method, so it is unavoidable to use layers in the design and fabrication of various graphics. Layers are one of the most characteristic tools in Photoshop, which can be divided into normal layers, adjustable layers, fill layers, shape layers, and text layers in 5 categories. Next small series to tell you how to use the layer effect to create a simple special effects word. (1) First, the editor can open a picture as a background

Matrix changes generally include three parts: WVP. This article is devoted to explaining some principles in the Construction of P Matrix, that is, projection cropping matrix. Learn more before you start. The role of the projection matrix is to save the objects in the cone and eventually correspond to the viewport. The process is roughly three steps. First, the cone is projected to become a so-called paralle

coordinate system definition and projection transformation in ArcGISArcGIS the coordinate system definition and projection transformation inCoordinate system is the important mathematical foundation of GIS data, it is used to represent the reference system of geographical features, images and observations, and the definition of coordinate system can ensure that geographic data display its position, directio

Google Maps, Virtual earth and other network geographic use of map projection, often known as the web Mercator or spherical Mercator, its main difference with the conventional Mercator projection is to simulate the world as a sphere rather than ellipsoid. It is recommended to do a basic understanding of map projection knowledge, "map

The projection conversion method defined in ArcGIS is often unsuitable for projects with high spatial information requirements and has obvious deviations. In the preliminary data preparation of the project, a more precise projection conversion of three or seven parameters is required. The following describes two methods to perform this conversion in ArcGIS Desktop. Method 1: perform dynamic conversion (on

It is well known that SVM is a global optimal solution by solving a two-time programming problem, which leads to a lot of memory and time in practical applications. Most of the existing methods reduce support vectors by reducing training samples, which speeds up training. This article is from Li Qing and other paper "Support vector machine pre-selection based on vector projection". The basic idea is that M1 and M2 are 1 kinds of samples, the center p

There are two ways of using the Gluproject function: Gldouble modelview[16]; Gldouble projection[16]; Gldouble out[3], in[3]; Assign value to in ... Glpushmatrix (); Glgetdoublev (Gl_modelview_matrix, Modelview); Glgetdoublev (Gl_projection_matrix, PROJECTION); Gluproject (in[0],in[1],in[2],modelview,projection,viewport, (out[0]), (out[1]), (out[2])); Gluproject

Coordinate System and Projection Transformation and Its Application in ArcGIS A batch of data needs to be processed recently, which involves the content of coordinate transformation. I will share my personal data collection and experience. please correct me if I have any shortcomings! First, I would like to raise the following questions:Is there a coordinate conversion problem? Is there a problem with projection