GLCLIPPLANE - Online Linux Manual PageSection : 3G
NAME"glClipPlane − specify a plane against which all geometry is clipped
C SPECIFICATIONvoid glClipPlane( GLenum plane, const GLdouble *equation )
PARAMETERSplane  Specifies which clipping plane is being positioned. Symbolic names of the form ­GL_CLIP_PLANEi, where i is an integer between 0 and ­GL_MAX_CLIP_PLANES-1, are accepted. equation  Specifies the address of an array of four double-precision floating-point values. These values are interpreted as a plane equation.
DESCRIPTIONGeometry is always clipped against the boundaries of a six-plane frustum in x, y, and z. ­glClipPlane allows the specification of additional planes, not necessarily perpendicular to the x, y, or z axis, against which all geometry is clipped. To determine the maximum number of additional clipping planes, call ­glGetIntegerv with argument ­GL_MAX_CLIP_PLANES. All implementations support at least six such clipping planes. Because the resulting clipping region is the intersection of the defined half-spaces, it is always convex. ­glClipPlane specifies a half-space using a four-component plane equation. When ­glClipPlane is called, equation is transformed by the inverse of the modelview matrix and stored in the resulting eye coordinates. Subsequent changes to the modelview matrix have no effect on the stored plane-equation components. If the dot product of the eye coordinates of a vertex with the stored plane equation components is positive or zero, the vertex is in with respect to that clipping plane. Otherwise, it is out. To enable and disable clipping planes, call ­glEnable and ­glDisable with the argument ­GL_CLIP_PLANEi, where i is the plane number. All clipping planes are initially defined as (0, 0, 0, 0) in eye coordinates and are disabled.
NOTESIt is always the case that ­GL_CLIP_PLANEi = ­GL_CLIP_PLANE0~+~i.
ERRORS­GL_INVALID_ENUM is generated if plane is not an accepted value. ­GL_INVALID_OPERATION is generated if ­glClipPlane is executed between the execution of ­glBegin and the corresponding execution of ­glEnd.
ASSOCIATED GETS­glGetClipPlane
­glIsEnabled with argument ­GL_CLIP_PLANEi
SEE ALSO­glEnable(3G) 0
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