OpenGL视角LooAt及Perspective理解glm::mat4projection=glm::perspective(fovyInRadians,aspect,zNear,zFar);voidgluLookAt(GLdoubleeyeX,GLdoubleeyeY,GLdoubleeyeZ,GLdoublecenterX,GLdoublecenterY,GLdoublecenterZ,GLdoubleupX,GLdoubleupY,GLdouble