Class: Rubytracer::View

Inherits:
Object
  • Object
show all
Defined in:
lib/rubytracer/view.rb

Instance Method Summary collapse

Constructor Details

#initialize(view_point, look_at_point, view_up, h_fov, height, width, multi) ⇒ View

Returns a new instance of View.



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# File 'lib/rubytracer/view.rb', line 5

def initialize(view_point, look_at_point, view_up, h_fov, height, width, multi)
  view_direction = (look_at_point - view_point).unit
  view_up = view_up - view_direction * view_up.dot(view_direction)
  spacing = 2 * Math.tan(h_fov * Math::PI / 360) / width

  @point = view_point
  @multi = multi
  @y_vector = -spacing * view_up.unit
  @x_vector = spacing * view_up.unit.cross(view_direction.unit).unit
  @top_left = (view_point + view_direction) - (@y_vector * height / 2  + @x_vector * width / 2)
end

Instance Method Details

#eye_ray(row, col) ⇒ Object 



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# File 'lib/rubytracer/view.rb', line 17

def eye_ray(row, col)
  dy = @y_vector * (row + 0.5)
  dx = @x_vector * (col + 0.5)
  point = @top_left + dy + dx
  Geom3d::Ray.new(@point, point - @point)
end