gl.ClipPlane(plane, equationArray)
gl.ClipPlane()
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 gl.Get() 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.
gl.ClipPlane()
specifies a half-space using a four-component plane equation. When gl.ClipPlane()
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 gl.Enable() and gl.Disable()
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.
It is always the case that #GL_CLIP_PLANEi
= #GL_CLIP_PLANE0
+ i.
Please consult an OpenGL reference manual for more information.
#GL_CLIP_PLANEi
, where i is an integer between 0 and #GL_MAX_CLIP_PLANES
-1 , are accepted#GL_INVALID_ENUM
is generated if plane is not an accepted value
#GL_INVALID_OPERATION
is generated if gl.ClipPlane()
is executed between the execution of gl.Begin() and the corresponding execution of gl.End()
gl.IsEnabled() with argument #GL_CLIP_PLANEi