glulookat / gluperspective / glfrustrum / glortho

다른 유틸리티를 같은 레벨로 봤군...

gluLookAt과 gluPerspective는 카메라를 조작하는 방법인데

glu로 시작하듯 gl Utility 계열이고

gl로 시작하는 glFrustum 과 glOrtho는

프로젝션 뷰를 perspective와 orthogonal로 설정하도록 한다.

 

Name gluLookAt — define a viewing transformation C Specification void gluLookAt( GLdouble eyeX,   GLdouble eyeY,   GLdouble eyeZ,   GLdouble centerX,   GLdouble centerY,   GLdouble centerZ,   GLdouble upX,   GLdouble upY,   GLdouble upZ);

[링크 : https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/gluLookAt.xml]

 

Name gluPerspective — set up a perspective projection matrix C Specification void gluPerspective( GLdouble fovy,   GLdouble aspect,   GLdouble zNear,   GLdouble zFar);

[링크 : https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/gluPerspective.xml]

 

Name glFrustum — multiply the current matrix by a perspective matrix C Specification void glFrustum( GLdouble left,   GLdouble right,   GLdouble bottom,   GLdouble top,   GLdouble nearVal,   GLdouble farVal);

[링크 : h]ttps://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glFrustum.xml]

 

Name glOrtho — multiply the current matrix with an orthographic matrix C Specification void glOrtho( GLdouble left,   GLdouble right,   GLdouble bottom,   GLdouble top,   GLdouble nearVal,   GLdouble farVal);

[링크 : https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glOrtho.xml]