glPushMatrix man page on DigitalUNIX

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glPopMatrix(3G)						       glPopMatrix(3G)

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

SYNOPSIS
       void glPopMatrix(
	       void );

DESCRIPTION
       There  is  a stack of matrices for each of the matrix modes. In GL_MOD‐
       ELVIEW 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 option 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 exe‐
       cution 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(3),  glLoadIdentity(3),   glLoadMatrix(3),   glMatrixMode(3),
       glMultMatrix(3),	 glOrtho(3),  glRotate(3), glScale(3), glTranslate(3),
       glViewport(3)

							       glPopMatrix(3G)
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