Class: GlimR::Camera

Inherits:
Transform show all
Defined in:
lib/glimr/renderer/camera.rb

Overview

Camera is a special Transform that applies to both the OpenGL projection matrix and modelview matrix.

Instance Attribute Summary collapse

Attributes inherited from Transform

#collapsed_matrix, #matrix, #position, #rotation, #scale

Attributes inherited from SceneObject

#children, #drawables, #mtime, #parent, #viewport

Attributes included from EventListener

#event_listeners, #listener_count

Instance Method Summary collapse

Methods inherited from Transform

#===, #angle, #angle=, #clone, #collapse!, #inspect, #pop_state, #push_state, #replace!, rotate, rotate_aa, rotate_quat, scale, #touch!, #translate, translate, #x, #x=, #y, #y=, #z, #z=

Methods inherited from SceneObject

#<<, #absolute_geometry, #absolute_material, #absolute_shader, #absolute_texture, #absolute_transform_for_drawing, #add_drawables, #attach, #clone, #detach, #detach_self, #inspect, #pop_state, #push_state, #remove_drawables, #render, #replace_node, #root, #touch!, #visible

Methods included from EventListener

#add_event_listener, #decrement_listener_count, #dispatch_event, #event_root, #increment_listener_count, #method_missing, #multicast_event, #process_event, #remove_event_listener

Constructor Details

#initialize(*a, &b) ⇒ Camera

Returns a new instance of Camera.



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# File 'lib/glimr/renderer/camera.rb', line 25

def initialize(*a, &b)
  super
  @changed = true
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class GlimR::EventListener

Instance Attribute Details

#far ⇒ Object

Returns the value of attribute far.



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# File 'lib/glimr/renderer/camera.rb', line 11

def far
  @far
end

#fov ⇒ Object

Returns the value of attribute fov.



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# File 'lib/glimr/renderer/camera.rb', line 11

def fov
  @fov
end

#near ⇒ Object

Returns the value of attribute near.



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# File 'lib/glimr/renderer/camera.rb', line 11

def near
  @near
end

#perspective ⇒ Object

Returns the value of attribute perspective.



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# File 'lib/glimr/renderer/camera.rb', line 11

def perspective
  @perspective
end

Instance Method Details

#absolute_transform ⇒ Object 



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# File 'lib/glimr/renderer/camera.rb', line 55

def absolute_transform
  collapse! unless @collapsed_matrix
  @collapsed_matrix
end

#apply ⇒ Object

Sets up the camera projection to the projection matrix



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# File 'lib/glimr/renderer/camera.rb', line 31

def apply
  MatrixMode(PROJECTION)
  LoadIdentity()
  if perspective
    top = Math.tan(fov*Math::PI/360) * near
    bottom = -top
    left = viewport.aspect * bottom
    right = viewport.aspect * top
    Frustum(left,right, bottom,top, near,far)
  else
    Ortho(viewport.x,viewport.width, viewport.y,viewport.height, near,far)
    Scale(1,-1,1)
    Translate(0,-viewport.height,0)
  end
  MatrixMode(MODELVIEW)
  LoadIdentity()
  super
end

#default_config ⇒ Object 



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# File 'lib/glimr/renderer/camera.rb', line 13

def default_config
  super.merge(
    :position => [0,0,5000],
    :looking_at => [0,0,0],
    :up => [0,1,0],
    :near => 1,
    :far => 10000,
    :fov => 60,
    :perspective => false
  )
end

#gl_transform ⇒ Object

Uses GLU.LookAt to position the camera.



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# File 'lib/glimr/renderer/camera.rb', line 51

def gl_transform
  GLU.LookAt(*position+looking_at+up)
end