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            Shuffy

            不斷的學習,不斷的思考,才能不斷的進步.Let's do better together!
            posts - 102, comments - 43, trackbacks - 0, articles - 19

            《基于MFC的OpenGL編程》Part 1 A Primer

            Posted on 2010-03-31 20:18 Shuffy 閱讀(274) 評論(0)  編輯 收藏 引用 所屬分類: MFC,OpenGL

            3D圖形學基本概念

            Perspective

            Perspective refers to the angles between the lines that lend the illusion of three dimensions.

            Colors and Shading

            Moving beyond line drawing, we need to add color to create a solid object. Shading refers to the way the color is applied to the polygon. Shading can be of two types in OpenGL - Flat or Smooth.

            Lights and Shadows

            Plain solid color doesn’t offer enough realism. By applying Lighting effects we can make objects appear as they would in reality depending on their material properties and the lighting parameters. Adding a shadow further increases realism.

            Texture Mapping

            With Texture Mapping we can have wood grains, cloth textures, brick like textures etc instead of plain materials. This technique of applying an image to the surface of a polygon is called Texture Mapping. The image we use is called the Texture and the individual elements of the texture are called Texels.

            Fog

            Fog is an atmospheric effect that adds haziness to objects in a scene depending on how far the objects are from the viewer.

            Blending and Transparency

            Blending is the combination of colors of objects on the screen. This effect can be used for a variety of purposes. By varying the amount each object is blended with the scene we can make objects look transparent.

            Anti-Aliasing

            Aliasing is an effect that is visible on screen due to the fact that an image consists of discrete pixels. By carefully blending the lines with the background color we can eliminate jagged edges and give them a smooth appearance. This blending technique is called anti-aliasing.

            第一個OpenGL程序

            //Simple.cpp - First OpenGL Program
            #include <windows.h> //Required for every Windows Program
            #include <gl\glut.h> //Required for using the GLUT library     
            //Perform OpenGL Initialization here 
            void SetupRC()
            {
                
            //Set the background clearing color to blue
                glClearColor(0.0f,0.0f,1.0f,1.0f);//設置背景色為藍色
            }
            //The drawing callback function
            void RenderScene()
            {
                
            //Clear the color buffer 
                glClear(GL_COLOR_BUFFER_BIT);
                
            //Flush the rendering pipeline
                glFlush();
            }
            void main()
            {
                
            //Choose the display mode settings
                glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//初始化顯示模式(單緩沖,RGB)
                
            //Create the Window
                glutCreateWindow("Simple");//創建窗口
                
            //Set the RenderScsne function as the display callback
                glutDisplayFunc(RenderScene);//繪制回調函數,當窗口需要繪制時,GLUT會調用此函數
                
            //Initialize OpenGL
                SetupRC();//初始化OpenGL
                
            //Start the GLUT framework
                glutMainLoop();//開始消息循環
            }

             

            作者:洞庭散人

            出處:http://phinecos.cnblogs.com/    

            本文版權歸作者和博客園共有,歡迎轉載,但未經作者同意必須保留此段聲明,且在文章頁面明顯位置給出原文連接,否則保留追究法律責任的權利。
            原文鏈接:http://www.cnblogs.com/phinecos/archive/2008/11/04/1326648.html
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