关于opengl的几个函数

voidgluLookAT(

/*相机位置 */

GLdoubleeyex,GLdoubleeyey,GLdoubleeyez,

/*注视点位置 */

GLdoublecx,GLdoublecy,GLdoublecz,

/*相机朝上的方向 */

GLdoubleupx,GLdoubleupy,GLdoubleupz,

)

voidglFrustum(

GLdoubleleft,GLdoubleright,GLdoublebottom,

GLdoubletop,GLdoublenear,GLdoublefar

)

voidgluPerspective (

GLdoublefovy,GLdoubleaspect,

GLdoublenear,GLdoublefar

)

voidglOrtho(

GLdoubleleft,GLdoubleright,GLdoublebottom,

GLdoubletop,GLdoublenear,GLdoublefar

)

voidglViewport(

GLintx,GLinty,GLsizeiwidth,GLsizeiheight

)