receiver part. The space constellation is composed of 24 navigation satellites, which is equivalent to providing 24 known space points. The ground monitoring part is used to monitor the state of the satellite and to revise the satellite orbit information. The user receiver is used to receive the satellite signal and complete the analysis and calculation of the signal to obtain the necessary navigation and positioning information.
This paper chooses the Lassen SQ/IQ series GPS receiver module of
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horizontal,YAxis is vertical up along the screen,ZThe axis is the vertical screen that points out to the user. Of course, if you convert the viewpoint in the program, you can no longer think of it as this.
The visual coordinate system, also known as the local coordinate system. It is a left-hand coordinate system that can be active. In the initial state, the origin andX, YThe Origin andX, YThe axes overlap, whileZThe axis is the opposite, that is, in
I. Five viewpoints: Enterprise viewpoint, information viewpoint, computing viewpoint, engineering viewpoint, and Technical Viewpoint
Enterprise perspective: Enterprise Business architecture [from the enterprise (customer) perspective, ideological architecture, such as busin
OpenGl basics 2. opengl
Basic graphic rendering process
1. create GLSurfaceView 2. initialize Renderer 3. onSurfaceCreated (), onSurfaceChanged (), onDrawFrame () Three Methods 4. coloring tool (vertex coloring tool, chip coloring tool) 5. vertex color texture 6. draw
Projection
OpenGL only provides two projection methods:
One is normal Projection, and the other is Orthographic Projection: There is no near-large effect of normal Projection, also known as parallel Projection. The projected visua
concept of a viewpoint. Viewpoints do not describe hierarchies, but rather provide different ways of looking at things. From the software system is generally divided into four viewpoints, namely: 1. Database viewpoint: is a persistent layer of software for storing data 2. Application Viewpoint: Is the executable part of the solution, including domain model, clas
Liskov substitution principle (LSP)
Definition:
Functions that use pointers or references to base classes must be able to use objects of derived classes without knowing it.
All references to the base class must be transparent to use its subclass objects.
That is to say, as long as the parent class appears, the Child class can appear, and replacing it with the Child class will not produce any errors or exceptions. However, if the child class is replaced with the parent class, a problem may occur.
This article uses two methods to implement the zoom-in and zoom-out function in OpenGL:
Method 1. Change the distance between the "Viewpoint" and the model [change the model viewpoint transformation matrix]
There are three problems to solve in this method:
① Smooth transition during Scaling
② When a model is scaled up or down to a certain extent, the scaling speed is slowed down to prevent the
, the eye coordinate of the vertex is
Similarly, if p is a projection matrix, the editing matrix is
The normalized device coordinate is
2.10.1 control viewpoint
The viewpoint conversion is determined by the viewpoint width and height. The aspect height is measured in pixels, which are PX and Py respectively. The center is (OX, Oy), and the Unit is also pixe
Author: Zhu Jincan
Source: http://blog.csdn.net/clever101
Our company invited a lecturer to give us training near the end of the year. The subject should be a design craftsman. To be honest, I can't organize all the content that I have mentioned in my lecture as a lecturer. Let me talk about some of my notes. In general, this Lecturer has rich practical experience and is also vivid.
Viewpoint 1: there is a conflict between code scalability and maint
the highlight index,VThe unit vector from the vertex to the viewpoint,RThe unit vector of the reflected light direction.RAccessible andLFind,
R= 2-L
The final model is:
Ispec =
Corrected the mirror light model (BlinN-phong illumination model)
BlinN-Phong is a Phong-based model correction model. Its formula is as follows:
Ispec = KS * Il *
WhereNIs the unit method vector of the incident point,HIs the light Incident DirectionLAnd
1. Observe the target point and the upper direction In order to determine the observer's state, you need to obtain two information: The Observer's position, the point of view (Look-at point), which is the spot where the target is being observed, which can be used to determine the line of sight. Also, because we need to draw the observed scene onto the screen, we need to know the upper direction (up direction). With these three messages, you can determine the state of the Observer.
In the x3d scene space, X3D provides the point of view node viewpoint in order to enable the viewer to conveniently control the position and angle of observation. At the same time, in order to be able to browse in different ways, X3D provides the Navigationinfo navigation node.
Here is a description of the use of these two nodes.
One, Viewpoint node
The Viewpoint
left, gldouble right, gldouble bottom, gldouble top, gldouble near, gldouble far);Creates a perspective-oriented view body. Its operation is to create a matrix of perspective projections and multiply the matrix by the current matrix. The parameter of this function only defines the three-dimensional space coordinates of the lower-left and upper-right points of the clipping plane, i.e. (left,bottom,-near) and (right,top,-near); The last parameter far is the distance from the
left, gldouble right, gldouble bottom, gldouble top, gldouble near, gldouble far);Creates a perspective-oriented view body. Its operation is to create a matrix of perspective projections and multiply the matrix by the current matrix. The parameter of this function only defines the three-dimensional space coordinates of the lower-left and upper-right points of the clipping plane, i.e. (left,bottom,-near) and (right,top,-near); The last parameter far is the distance from the
the positive direction of the datum axis (as determined by the rotation method used, such as the Rotatex () datum axis is the x-axis). Consider a plane surrounded by a black border as an element, with an x-axis as the Datum axis, at which point the element is rotated (+) 30°, that is, the black plane is fixed on the x-axis, and the y-axis is on the side of the positive direction (like lifting a piece of wood, the raised plank is still in a plane, but not Rotatey () in the same vein. Rotatez ()
due to the constant shift in traffic jams or traffic lights in big cities. In short, automatic is synonymous with comfort ......
Of course, you may also choose to manually solve such problems:
Manual shift school viewpoint 1: speed up the manual shift.
Counterargument:If you are a racing driver or fans with an avid head character D, if you are eager to stay on the bustling Road and stay out of the car, keep hitting the accelerator, and keep high
can be regarded as a method of turning three-dimensional coordinates into two-dimensional coordinates.Camera settingsPerspective projection: Similar to the human visual system, it is used in three-dimensional plane to render the three-dimensional world. The model is composed by the viewpoint E and the view plane p two parts (requires e not on the plane p), the viewpoint is the observer position, namely the
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