Method: Mittsu::ShadowMapPlugin#update_shadow_camera

Defined in:
lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb

#update_shadow_camera(camera, light) ⇒ Object

fit shadow camera’s ortho frustum to camera frustum



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 368

def update_shadow_camera(camera, light)
  shadow_camera = light.shadow_camera
  points_frustum = light.pointa_frustum
  points_world = light.points_world

  @min.set(Float::INFINITY, Float::INFINITY, Float::INFINITY)
  @max.set(-Float::INFINITY, -Float::INFINITY, -Float::INFINITY)

  8.times do |i|
    p = points_world[i]

    p.copy(points_frustum[i])
    p.unproject(camera)

    p.apply_matrix4(shadow_camera.matrix_world_inverse)

    @min.x = p.x if (p.x < @min.x)
    @max.x = p.x if (p.x > @max.x)

    @min.y = p.y if (p.y < @min.y)
    @max.y = p.y if (p.y > @max.y)

    @min.z = p.z if (p.z < @min.z)
    @max.z = p.z if (p.z > @max.z)
  end

  shadow_camera.left = @min.x
  shadow_camera.right = @max.x
  shadow_camera.top = @max.y
  shadow_camera.bottom = @min.y

  # can't really fit near/far
  # shadow_camera.near = @min.x
  # shadow_camera.far = @max.z

  shadow_camera.update_projection_matrix
end