[2] = { -0.5, cy},Pointe[2] = {-bx, by};Glclear (Gl_color_buffer_bit);According to the order of A->c->e->b->d->a, you can draw the pentagramGlbegin (Gl_line_loop);GLVERTEX2FV (Pointa);GLVERTEX2FV (POINTC);GLVERTEX2FV (PointE);GLVERTEX2FV (POINTB);GLVERTEX2FV (POINTD);Glend ();Glflush ();}Example three, draw a graph of sine function/*Since OpenGL default coordinat
. Renderer interface methods:
1. onsurfacecreated ()
When creating a glsurfaceview object, the system calls this method once. This method is used to execute actions that only occur once, such as setting OpenGL environment parameters or initializing OpenGL graphics objects.
2. ondrawframe ()
This method is called every
glsl generated by the CG compiler requires some adjustments to work on the ATI driver. Therefore, an extra conversion is required. Fortunately, these tasks can be completed automatically through the program, and the speed is very fast. For details, refer to klayge's oglshaderobject: converttoglsl. In fact, all shader of klayge only writes one copy (the syntax uses HLSL 11 ), different APIs can be automatically compiled into Native shader for use (compilers with
AbstractY = a + B; how can we use digital reality for a very simple computing?
IntroductionUse environment: US us II 8.0
Y = a + B; this is a simple operation in C. However, if you want to use OpenGL on the digital path, beginners may encounter some difficulties.
Y = a + B
Do not use clockAdd2_assign.v/OpenGL
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter
/////////////////////////////////////////////////////////////////////////////bool CopenGLMFCView:: Setuppixelformat () {static Pixelformatdescriptor PFD = {sizeof (pixelformatdescriptor),//size of this PFD 1,//version number Pfd_draw_to_window | Support Window Pfd_support_opengl | Support OpenGL Pfd_doublebuffer,//Double buffered Pfd_type_rgba,//RGB A type,//24-bit color depth 0
OpenGL ES 2.0 VBO and rendering
1.VBO Initialization1) glgenbuffers () generates Bufferid 2) Glbindbuffer () operates it, the parameter is Vbo Bufferid 3) glbufferdata () specifies the data and usage inside
When you want to use this VBO then Glbindbuffer () its bufferid, which generally put vertex data (including the model of XYZ and texture coordinates UV), in
1. Drawing Basics
Clear window
Glclearcolor (0.0, 0.0, 0.0, 0.0 );Glclear (gl_color_buffer_bit );
The first code sets "clear color", and the second code resets the current color buffer to "clear color ".
In addition to the color buffer (color buffer, corresponding pixel color on the screen), the graphic hardware also has other buffers, such as depth, stencer, accumulation, which are used to set the clearing values of these buffers respectively: glclea
Chapter 1 use OpenGL in inventor
Objectives of this Chapter
After reading this chapter, we will be able to do the following:
L create an inventor callback node and call the OpenGL library function in the callback function.
L understand how inventor uses and affects OpenGL State Variables
L compile a program
Tool: xcode 4.2
Development Environment: cocoa, OpenGL, objective-C
1. Create a project myopengl
Open xcode, select create a new xcode project, select cocoa application in the pop-up window, and enter the project name myopengl after the next step.
The xcode window is as follows:
2. Add OpenGL and glut Libraries
Click
file and Library to the project.
Add the following header files
# Include # Include
Add the following library files (not always used)
Opengl32.lib
Glu32.lib
GLUT. Lib
Glaux. Lib
After the preparation is complete, configure the environment and initialize the environment ~
1. Rewrite the onprecreate function and add member functions and member variables to the View class.
OpenGL requires ws_clipchildren (W
Original works can be reprinted. During reprinting, you must mark the original source, author information, and this statement in hyperlink form. Otherwise, legal liability will be held. Http://yarin.blog.51cto.com/1130898/380265
Lesson 2: Polygon
Your first polygon:
Based on the first tutorial, we added a triangle and a quadrilateral. You may think this is simple, but you have taken a big step to know that any model drawn in
in an application, understanding how to implement these classes in an Activity should be the first goal.
GLSurfaceView
This class is a View. In this class, you can draw and maintain objects called using OpenGL APIs, and it is similar to the SurfaceView class. Create an instance of the GLSurfaceView class and add a Renderer object to it to use this class. However, if you want to capture touch screen events, you should inherit the GLSurfaceView class a
. We only have one attribute, so the value is 0. If we have two attributes, A position and a normal direction. If they are all vectors in the 3-dimensional float format, this parameter must be set to (6*4) = 24 byte, And the last parameter is offset, if there are two attributes, this value is 0 for the first attribute, no offset, and 12 for the second attribute.
glDrawArrays(GL_POINTS, 0, 1);
Finally, we call the draw function, which is the starting p
NeHe OpenGL lession 2, neheopengllession
# Include
Mac OS X running command:
$: Clang-o lession lession2.c-Wno-deprecated-framework OpenGL-framework GLUT
$:./Lession
OpenGL, DirectX
Learning is done in parallel. You cannot do it in this way. If you want to learn a game, you can:C, c ++ syntax level,
Original address: opencv for iOS Study Notes (9)-rendering ar scenario 2 with OpenGL
The operation procedure of drawframe is:
1. Clear the scenario.
2. Start the normal projection to draw the background.
3. Draw the last image obtained from the camera in the viewport.
4. Set Perspective Projection based on internal c
From: http://www.cnblogs.com/opengl/archive/2012/11/14/2770745.html
To add light to a scene, perform the following steps:
(1) set one or more light sources and related properties;
(2) Select a illumination model;
(3) set the material attributes of an object.
The details are as follows:
1. Set the light source
(
closer to the screen smooth. The third texture (texture 2) uses the mipmapped filtering method, which creates a texture with excellent appearance. Based on our usage type, the values of the filter variables are equal to 0, 1, or 2. Next we start with the first texture.Gluint texture [3] allocates storage space for three different textures. They are located in te
Generate entities based on vertex cacheOriginal (English link) http://ogldev.atspace.co.uk/www/tutorial03/tutorial03.html1 __author__="WSX"2 3 ImportNumPy as NP4 fromOpengl.glutImport*5 fromOpengl.glImport*6 ImportcTYPES7 defDraw ():8 glclear (gl_color_buffer_bit)9 Glenablevertexattribarray (0)Ten Glbindbuffer (Gl_array_buffer, VBO) OneGlvertexattribpointer (0, 3, gl_float, Gl_false, 0, None)#None of this here can be written as 0. AGldrawarrays (gl_
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