Class: Stagecraft::Cameras::Perspective

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

Instance Attribute Summary collapse

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(fov: 50.0, aspect: 1.0, near: 0.1, far: 2_000.0) ⇒ Perspective

Returns a new instance of Perspective.



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 8

def initialize(fov: 50.0, aspect: 1.0, near: 0.1, far: 2_000.0, **)
  super(**)
  @projection_revision = 0
  @cached_projection_revision = -1
  self.fov = fov
  self.aspect = aspect
  self.near = near
  self.far = far
end

Instance Attribute Details

#aspect ⇒ Object

Returns the value of attribute aspect.



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 6

def aspect
  @aspect
end

#far ⇒ Object

Returns the value of attribute far.



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 6

def far
  @far
end

#fov ⇒ Object

Returns the value of attribute fov.



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 6

def fov
  @fov
end

#near ⇒ Object

Returns the value of attribute near.



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 6

def near
  @near
end

Instance Method Details

#projection_matrix ⇒ Object 



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# File 'lib/stagecraft/cameras/perspective_camera.rb', line 36

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

  radians = fov * Math::PI / 180.0
  f = 1.0 / Math.tan(radians / 2.0)
  @projection_matrix = Larb::Mat4.new([
    f / aspect, 0.0, 0.0, 0.0,
    0.0, f, 0.0, 0.0,
    0.0, 0.0, far / (near - far), -1.0,
    0.0, 0.0, (near * far) / (near - far), 0.0
  ])
  @cached_projection_revision = @projection_revision
  @projection_matrix
end