glOrtho(3G) glOrtho(3G)[top]NAMEglOrtho- multiply the current matrix with an orthographic matrixSYNOPSISvoid glOrtho( GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble zNear, GLdouble zFar );PARAMETERSSpecify the coordinates for the left and right vertical clipping planes. Specify the coordinates for the bottom and top horizontal clipping planes. Specify the distances to the nearer and farther depth clipping planes. These values are negative if the plane is to be behind the viewer.DESCRIPTIONglOrtho() describes a transformation that produces a parallel projec‐ tion. The current matrix (see glMatrixMode()) is multiplied by this matrix and the result replaces the current matrix, as if glMultMatrix() were called with the following matrix as its argument: 2 / right-left 0 0 t[x] 0 2 / top-bottom 0 t[y] 0 0/ zFar - zNear t[z] 0 0 0 1 where t[x] = - right + left / right - left t[y] = - top + bottom / top - bottom t[z] = zFar + zNear / zFar - zNear Typically, the matrix mode is GL_PROJECTION, and (left, bottom, -zNear) and (right, top, -zNear) specify the points on the near clip‐ ping plane that are mapped to the lower left and upper right corners of the window, respectively, assuming that the eye is located at (0, 0, 0).-2specifies the location of the far clipping plane. Both zNear and zFar can be either positive or negative. Use glPushMatrix() and glPopMatrix() to save and restore the current matrix stack.-zFarERRORSGL_INVALID_OPERATION is generated if glOrtho() is executed between the execution of glBegin() and the corresponding execution of glEnd().ASSOCIATED GETSglGet() with argument GL_MATRIX_MODE glGet() with argument GL_COLOR_MATRIX glGet() with argument GL_MODELVIEW_MATRIX glGet() with argument GL_PROJECTION_MATRIX glGet() with argument GL_TEXTURE_MATRIXSEE ALSOglFrustum(3), glMatrixMode(3), glMultMatrix(3), glPushMatrix(3), glViewport(3) glOrtho(3G)

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