Class: Geom::Plane

Inherits:
Object
  • Object
show all
Defined in:
lib/geom/plane.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(normal = nil, point = nil) ⇒ Plane

Returns a new instance of Plane.



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# File 'lib/geom/plane.rb', line 4

def initialize(normal=nil,point=nil)
  if normal && point
    @normal = normal
    @d      = -Number3D.dot(normal,point)
  else
    @normal = Number3D.new
    @d      = 0
  end
end

Instance Attribute Details

#normal ⇒ Object

Returns the value of attribute normal.



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# File 'lib/geom/plane.rb', line 3

def normal
  @normal
end

Class Method Details

.three_points(p0, p1, p2) ⇒ Object 



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# File 'lib/geom/plane.rb', line 14

def self.three_points(p0,p1,p2)
  plane = Plane.new
  n0 = p0.instance_of?(Number3D) ? p0 : p0.position
  n1 = p1.instance_of?(Number3D) ? p1 : p1.position
  n2 = p2.instance_of?(Number3D) ? p2 : p2.position
  plane.set_three_points(n0,n1,n2)
  plane
end

Instance Method Details

#distance(point) ⇒ Object 



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# File 'lib/geom/plane.rb', line 31

def distance(point)
  p = point.instance_of?(Vertex) ? point.position : point
  Number3D.dot(p,@normal) + @d
end

#set_three_points(p0, p1, p2) ⇒ Object 



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# File 'lib/geom/plane.rb', line 23

def set_three_points(p0,p1,p2)
  ab = Number3D.sub(p1,p0)
  ac = Number3D.sub(p2,p0)
  @normal = Number3D.cross(ab,ac)
  @normal.normalize
  @d = -Number3D.dot(@normal,p0)
end