glPopMatrix

GLPUSHMATRIX(3G)					     GLPUSHMATRIX(3G)



NAME
       glPushMatrix, glPopMatrix - push and pop the current matrix stack


C SPECIFICATION
       void glPushMatrix( void )


C SPECIFICATION
       void glPopMatrix( void )


DESCRIPTION
       There  is  a  stack  of	matrices  for  each  of the matrix modes.  In
       GL_MODELVIEW mode, the stack depth is  at  least	 32.   In  the	other
       modes,  GL_COLOR,  const(PROJECTION),  and GL_TEXTURE, the depth is at
       least 2.	 The current matrix in any mode is the matrix on the  top  of
       the stack for that mode.

       glPushMatrix  pushes the current matrix stack down by one, duplicating
       the current matrix.  That is, after a glPushMatrix call, the matrix on
       top of the stack is identical to the one below it.

       glPopMatrix  pops  the  current	matrix	stack,	replacing the current
       matrix with the one below it on the stack.

       Initially, each of the stacks contains one matrix, an identity matrix.

       It  is  an error to push a full matrix stack, or to pop a matrix stack
       that contains only a single matrix.  In either case, the error flag is
       set and no other change is made to GL state.

ERRORS
       GL_STACK_OVERFLOW  is  generated	 if  glPushMatrix is called while the
       current matrix stack is full.

       GL_STACK_UNDERFLOW is generated if glPopMatrix  is  called  while  the
       current matrix stack contains only a single matrix.

       GL_INVALID_OPERATION  is	 generated  if glPushMatrix or glPopMatrix is
       executed between the execution of glBegin and the corresponding execu-
       tion of glEnd.

ASSOCIATED GETS
       glGet 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_MATRIX
       glGet with argument GL_COLOR_STACK_DEPTH
       glGet with argument GL_MODELVIEW_STACK_DEPTH
       glGet with argument GL_PROJECTION_STACK_DEPTH
       glGet with argument GL_TEXTURE_STACK_DEPTH
       glGet with argument GL_MAX_MODELVIEW_STACK_DEPTH
       glGet with argument GL_MAX_PROJECTION_STACK_DEPTH
       glGet with argument GL_MAX_TEXTURE_STACK_DEPTH

SEE ALSO
       glFrustum(3G), glLoadIdentity(3G), glLoadMatrix(3G), glMatrixMode(3G),
       glMultMatrix(3G),     glOrtho(3G),     glRotate(3G),	 glScale(3G),
       glTranslate(3G), glViewport(3G)



							     GLPUSHMATRIX(3G)