Class: Stagecraft::Cameras::Orthographic

Inherits:
Camera
  • Object
show all
Defined in:
lib/stagecraft/cameras/orthographic_camera.rb

Constant Summary collapse

PROPERTIES = 
%i[left right top bottom near far].freeze

Instance Attribute Summary

Attributes inherited from Node

#cast_shadow, #children, #name, #parent, #position, #receive_shadow, #render_order, #rotation, #scale, #visible, #world_version

Instance Method Summary collapse

Methods inherited from Camera

#view_matrix, #view_projection_matrix

Methods inherited from Node

#add, #find, #local_matrix, #look_at, #remove, #transform_dirty!, #traverse, #world_matrix, #world_matrix_with_version, #world_position

Constructor Details

#initialize(left: -1.0,, right: 1.0, top: 1.0, bottom: -1.0,, near: 0.1, far: 2_000.0) ⇒ Orthographic

Returns a new instance of Orthographic.



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# File 'lib/stagecraft/cameras/orthographic_camera.rb', line 10

def initialize(left: -1.0, right: 1.0, top: 1.0, bottom: -1.0, near: 0.1, far: 2_000.0, **)
  super(**)
  @projection_revision = 0
  @cached_projection_revision = -1
  { left:, right:, top:, bottom:, near:, far: }.each do |name, value|
    public_send(:"#{name}=", value)
  end
  validate_extents!
end

Instance Method Details

#projection_matrix ⇒ Object 



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# File 'lib/stagecraft/cameras/orthographic_camera.rb', line 32

def projection_matrix
  return @projection_matrix if @cached_projection_revision == @projection_revision

  validate_extents!
  width = right - left
  height = top - bottom
  depth = far - near
  @projection_matrix = Larb::Mat4.new([
    2.0 / width, 0.0, 0.0, 0.0,
    0.0, 2.0 / height, 0.0, 0.0,
    0.0, 0.0, -1.0 / depth, 0.0,
    -(right + left) / width, -(top + bottom) / height, -near / depth, 1.0
  ])
  @cached_projection_revision = @projection_revision
  @projection_matrix
end