1、主要應(yīng)用：1 陰影(Shadow)2 散色(Scatter)3 CSG4 隱藏線消除5 非真實感繪制主要應(yīng)用：1 反走樣(Antialiasing)2 運動模糊(Motion Blur)3 景深(Depth of Field)4 柔和陰影(Soft Shadow)5 圖象處理(Image Processing)Aliasing SceneAntialiasing Scene0.43140.59760.07280.12220.36540.68770.06950.10120.05980.57440.38330.10110.03340.63020.32550.05790.89440.90510.83

2、020.8746Sub-pixelScreen Pixel GridSub-pixel Offset 41 41 41 41 Vid_mem = sizeof(Front_buffer) + sizeof(Back_buffer) + num_samples * (sizeof(Front_buffer) + sizeof(ZS_buffer)選擇像素格式的擴展選擇像素格式的擴展BOOL wglChoosePixelFormatARB( HDC hdc, /繪制設(shè)備句柄 const int *piAttribIList, /整數(shù)表示的(Type, Value)表 const FLOAT *pf

3、AttribFList, /浮點數(shù)表示的(Type, Value)表 UINT nMaxFormats, /要求返回的最多像素格式 int *piFormats, /返回的匹配像素格式列表 UINT *nNumFormats); /返回的匹配像素格式個數(shù) 41 41 41 41 161 161 161 161 81 81 81 81 41 4 Sample4 Tap Box Multi-Sampling 4 Sample9 Tap Box Multi-Sampling 2 sample 2 tap4 sample 9 tap2 sample 5 tap4 sample 4 tapTeapot

4、without hidden linesTeapot with hidden linesSilhouetteEyeSilhouette + True Edges SilhouetteProjective Texture Mapping From NVIDIA OpenGL SDK. Projspot Shadow Texture Mapping From demos. Shadow MappingglGenTexfv (GLenum coord, GLenum pname, const GLfloat* params)coord: GL_S, GL_T, GL_R, GL_Q; pname:

5、GL_EYE_PLANEparams: (p1, p2, p3, p4) glGenTexf (GLenum coord, GLenum pname, GLenum GLfloat)coord: GL_S, GL_T, GL_R, GL_Q; pname: GL_TEXTURE_GEN_MODEparams: GL_EYE_LINEARlightsource eyeposition depth map Z = Afragmentslight Z = Bdepth map image planeeye view image plane,a.k.a. the frame bufferlightso

6、urce eyeposition depth map Z = Afragmentslight Z = Bdepth map image planeeye view image plane,a.k.a. the frame bufferDepth Map From Light Space Scene From Light Space 1 copy depth buffer to texture函數(shù)：函數(shù)：void glCopyTexImage2D(GLenum target, GLint level, GLenum internalFormat, GLint x, GLint y, GLsize

7、i width, GLsizei height, GLint border )參數(shù)：指定參數(shù)：指定internalFormat 為為GL_DEPTH_COMPONENT.2 Shadow Comparisonvoid glTexParameteri( GLenum target, GLenum pname, GLint param )對參數(shù)對參數(shù)pname和和param擴展以下值來支持陰影比較擴展以下值來支持陰影比較GL_TEXTURE_COMPARE_MODE_ARB GL_COMPARE_R_TO_TEXTURE GL_TEXTURE_COMPARE_FUNC_ARB GL_DEPTH_T

8、EXTURE_MODE_ARB nerreflective surfaceenvironment mapeyeenrerre.nAssuming e and n are all normalized5 . 00.52222222221)(RzRyRx2Ryv1)(RzRyRx2Rxu1)(RzRyRx1)(Rx,Ry,RzN1)(Rx,Ry,Rz212VRNglTexGenf(GLenum coord, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP)參數(shù)：coord: GL_S, GL_TLeft ViewBottom ViewTop ViewRight ViewBack