Class: Mittsu::ShadowMapPlugin

Inherits:
Object
  • Object
show all
Defined in:
lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb

Instance Method Summary collapse

Constructor Details

#initialize(renderer, lights, opengl_objects, opengl_objects_immediate) ⇒ ShadowMapPlugin

Returns a new instance of ShadowMapPlugin.



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 6

def initialize(renderer, lights, opengl_objects, opengl_objects_immediate)
  @renderer, @lights = renderer, lights
  @opengl_objects = opengl_objects
  @opengl_objects_immediate = opengl_objects_immediate

  @frustum = Frustum.new
  @proj_screen_matrix = Matrix4.new

  @min = Vector3.new
  @max = Vector3.new

  @matrix_position = Vector3.new

  @render_list = []

  depth_shader = ShaderLib[:depth_rgba]
  depth_uniforms = UniformsUtils.clone(depth_shader.uniforms)

  @depth_material = ShaderMaterial.new(
    uniforms: depth_uniforms,
    vertex_shader: depth_shader.vertex_shader,
    fragment_shader: depth_shader.fragment_shader
  )

  @depth_material_morph = ShaderMaterial.new(
    uniforms: depth_uniforms,
    vertex_shader: depth_shader.vertex_shader,
    fragment_shader: depth_shader.fragment_shader,
    morph_targets: true
  )

  @depth_material_skin = ShaderMaterial.new(
    uniforms: depth_uniforms,
    vertex_shader: depth_shader.vertex_shader,
    fragment_shader: depth_shader.fragment_shader,
    skinning: true
  )

  @depth_material_morph_skin = ShaderMaterial.new(
    uniforms: depth_uniforms,
    vertex_shader: depth_shader.vertex_shader,
    fragment_shader: depth_shader.fragment_shader,
    morph_targets: true,
    skinning: true
  )

  @depth_material.shadow_pass = true
  @depth_material_morph.shadow_pass = true
  @depth_material_skin.shadow_pass = true
  @depth_material_morph_skin.shadow_pass = true
end

Instance Method Details

#create_virtual_light(light, cascade) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 288

def create_virtual_light(light, cascade)
  DirectionalLight.new.tap do |virtual_light|
    virtual_light.is_virtual = true

    virtual_light.only_shadow = true
    virtual_light.cast_shadow = true

    virtual_light.shadow_camera_near = light.shadow_camera_near
    virtual_light.shadow_camera_far = light.shadow_camera_far

    virtual_light.shadow_camera_left = light.shadow_camera_left
    virtual_light.shadow_camera_right = light.shadow_camera_right
    virtual_light.shadow_camera_bottom = light.shadow_camera_bottom
    virtual_light.shadow_camera_top = light.shadow_camera_top

    virtual_light.shadow_camera_visible = light.shadow_camera_visible

    virtual_light.shadow_darkness = light.shadow_darkness

    virtual_light.shadow_darkness = light.shadow_darkness

    virtual_light.shadow_bias = light.shadow_cascade_bias[cascade]
    virtual_light.shadow_map_width = light.shadow_cascade_width[cascade]
    virtual_light.shadow_map_height = light.shadow_cascade_height[cascade]

    points_world = virtual_light.points_world = []
    points_frustum = virtual_light.points_frustum = []

    8.times do
      points_world << Vector3.new
      points_frustum << Vector3.new
    end

    near_z = light.shadow_cascade_near_z[cascade]
    far_z = light.shadow_cascade_far_z[cascade]

    points_frustum[0].set(-1.0, -1.0, near_z)
    points_frustum[1].set( 1.0, -1.0, near_z)
    points_frustum[2].set(-1.0,  1.0, near_z)
    points_frustum[3].set( 1.0,  1.0, near_z)

    points_frustum[4].set(-1.0, -1.0, far_z)
    points_frustum[5].set( 1.0, -1.0, far_z)
    points_frustum[6].set(-1.0,  1.0, far_z)
    points_frustum[7].set( 1.0,  1.0, far_z)
  end
end

#get_object_material(object) ⇒ Object

For the moment just ignore objects that have multiple materials with different animation methods Only the frst material will be taken into account for deciding which depth material to use for shadow maps



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 409

def get_object_material(object)
  if object.material.is_a?(MeshFaceMaterial)
    object.material.materials[0]
  else
    object.material
  end
end

#project_object(scene, object, shadow_camera) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 271

def project_object(scene, object, shadow_camera)
  if object.visible
    opengl_objects = @opengl_objects[object.id]

    if opengl_objects && object.cast_shadow && (object.frustum_culled == false || @frustum.intersects_object?(object) == true)
      opengl_objects.each do |opengl_object|
        object.model_view_matrix.multiply_matrices(shadow_camera.matrix_world_inverse, object.matrix_world)
        @render_list << opengl_object
      end
    end

    object.children.each do |child|
      project_object(scene, child, shadow_camera)
    end
  end
end

#render(scene, camera) ⇒ Object 



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 58

def render(scene, camera)
  return unless @renderer.shadow_map_enabled

  lights = []
  fog = nil

  # set GL state for depth map

  glClearColor(1.0, 1.0, 1.0, 1.0)
  glDisable(GL_BLEND)

  glEnable(GL_CULL_FACE)
  glFrontFace(GL_CCW)

  if @renderer.shadow_map_cull_face = CullFaceFront
    glCullFace(GL_FRONT)
  else
    glCullFace(GL_BACK)
  end

  @renderer.state.set_depth_test(true)

  # process lights
  #  - skip lights that are not casting shadows
  #  - create virtual lights for cascaded shadow maps

  @lights.select(&:cast_shadow).each do |light|
    if light.is_a?(DirectionalLight) && light.shadow_cascade
      light.shadow_cascade_count.times do |n|
        if !light.shadow_cascade_array[n]
          virtual_light = create_virtual_light(light, n)
          virtual_light.original_camera = camera

          gyro = Gyroscope.new
          gyro.position.copy(light.shadow_cascade_offset)

          gyro.add(virtual_light)
          gyro.add(virtual_light.target)

          camera.add(gyro)

          light.shadow_cascade_array[n] = virtual_light
        else
          virtual_light = light.shadow_cascade_array[n]
        end

        update_virtual_light(light, n)

        lights << virtual_light
      end
    else
      lights << light
    end
  end

  # render depth map

  lights.each do |light|
    if !light.shadow_map
      shadow_filter = LinearFilter
      if @renderer.shadow_map_type == PCFSoftShadowMap
        shadow_filter = NearestFilter
      end

      pars = { min_filter: shadow_filter, mag_filter: shadow_filter, format: RGBAFormat }

      light.shadow_map = OpenGLRenderTarget.new(light.shadow_map_width, light.shadow_map_height, pars)
      light.shadow_map.renderer = @renderer
      light.shadow_map_size = Vector2.new(light.shadow_map_width, light.shadow_map_height)

      light.shadow_matrix = Matrix4.new
    end

    if !light.shadow_camera
      case light
      when SpotLight
        light.shadow_camera = PerspectiveCamera.new(light.shadow_camera_fov, light.shadow_map_width / light.shadow_map_height, light.shadow_camera_near, light.shadow_camera_far)
      when DirectionalLight
        light.shadow_camera = OrthographicCamera.new(light.shadow_camera_left, light.shadow_camera_right, light.shadow_camera_top, light.shadow_camera_bottom, light.shadow_camera_near, light.shadow_camera_far)
      else
        puts "ERROR: Mittsu::ShadowMapPlugin: Unsupported light type for shadow #{light.inspect}"
        next
      end

      scene.add(light.shadow_camera)
      scene.update_matrix_world if scene.auto_update
    end

    if light.shadow_camera_visible && !light.camera_helper
      light.camera_helper = CameraHelper.new(light.shadow_camera)
      scene.add(light.camera_helper)
    end

    if light.virtual? && virtual_light.original_camera == camera
      update_shadow_camera(camera, light)
    end

    shadow_map = light.shadow_map
    shadow_matrix = light.shadow_matrix
    shadow_camera = light.shadow_camera

    #

    shadow_camera.position.set_from_matrix_position(light.matrix_world)
    @matrix_position.set_from_matrix_position(light.target.matrix_world)
    shadow_camera.look_at(@matrix_position)
    shadow_camera.update_matrix_world

    shadow_camera.matrix_world_inverse.inverse(shadow_camera.matrix_world)

    #


    light.camera_helper.visible = light.shadow_camera_visible if light.camera_helper
    light.camera_helper.update_points if light.shadow_camera_visible

    # compute shadow matrix

    shadow_matrix.set(
      0.5, 0.0, 0.0, 0.5,
      0.0, 0.5, 0.0, 0.5,
      0.0, 0.0, 0.5, 0.5,
      0.0, 0.0, 0.0, 1.0
    )

    shadow_matrix.multiply(shadow_camera.projection_matrix)
    shadow_matrix.multiply(shadow_camera.matrix_world_inverse)

    # update camera matrices and frustum

    @proj_screen_matrix.multiply_matrices(shadow_camera.projection_matrix, shadow_camera.matrix_world_inverse)
    @frustum.set_from_matrix(@proj_screen_matrix)

    # render shadow map

    @renderer.set_render_target(shadow_map)
    @renderer.clear

    # set object matrices & frustum culling

    @render_list.clear

    project_object(scene, scene, shadow_camera)

    # render regular obejcts

    @render_list.each do |opengl_object|
      object = opengl_object[:object]
      buffer = opengl_object[:buffer]

      # culling is overridden globally for all objects
      # while rendering depth map

      # need to deal with MeshFaceMaterial somehow
      # in that case just use the first of material.materials for now
      # (proper solution would require to break objects by materials
      #  similarly to regular rendering and then set corresponding
      #  depth materials per each chunk instead of just once per object)

      object_material = get_object_material(object)

      # TODO: SkinnedMesh/morph_targets
      # use_morphing = !object.geometry.morph_targets.nil? && !object.geometry.morph_targets.empty?
      # use_skinning = object.is_a?(SkinnedMesh) && object_material.skinning

      # TODO: SkinnedMesh/morph_targets
      # if object.custom_depth_material
      #   material = object.custom_depth_material
      # elsif use_skinning
      #   material = use_morphing ? @depth_material_morph_skin : @depth_material_skin
      # elsif use_morphing
      #   material = @deptth_material_morph
      # else
        material = @depth_material
      # end

      @renderer.set_material_faces(object_material)

      if buffer.is_a?(BufferGeometry)
        @renderer.render_buffer_direct(shadow_camera, @lights, fog, material, buffer, object)
      else
        @renderer.render_buffer(shadow_camera, @lights, fog, material, buffer, object)
      end
    end

    # set materices and rendr immeidate objects

    @opengl_objects_immediate.each do |opengl_object_immediate|
      opengl_object = opengl_object_immediate
      object = opengl_object[:object]

      if object.visible && object.cast_shadow
        object[:_model_view_matrix].multiply_matrices(shadow_camera.matrix_womatrix_world_inverse, object.matrix_world)
        @renderer.render_immediate_object(shadow_camera, @lights, fog, @depth_material, object)
      end
    end
  end

  # restore GL state

  clear_color = @renderer.get_clear_color
  clear_alpha = @renderer.get_clear_alpha

  glClearColor(clear_color.r, clear_color.g, clear_color.b, clear_alpha)
  glEnable(GL_BLEND)

  if @renderer.shadow_map_cull_face == CullFaceFront
    glCullFace(GL_BACK)
  end

  @renderer.reset_gl_state
end

#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

#update_virtual_light(light, cascade) ⇒ Object

synchronize virtual light with the original light



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# File 'lib/mittsu/renderers/opengl/plugins/shadow_map_plugin.rb', line 338

def update_virtual_light(light, cascade)
  virtual_light = light.shadow_cascade_array[cascade]

  virtual_light.position.copy(light.position)
  virtual_light.target.position.copy(light.target.position)
  virtual_light.look_at(virtual_light.target)

  virtual_light.shadow_camera_visible = light.shadow_camera_visible
  virtual_light.shadow_darkness = light.shadow_darkness

  virtual_light.shadow_bias = light.shadow_cascade_bias[cascade]

  near_z = light.shadow_cascade_near_z[cascade]
  far_z = light.shadow_cascade_far_z[cascade]

  points_frustum = virtual_light.points_frustum

  points_frustum[0].z = near_z
  points_frustum[1].z = near_z
  points_frustum[2].z = near_z
  points_frustum[3].z = near_z

  points_frustum[4].z = far_z
  points_frustum[5].z = far_z
  points_frustum[6].z = far_z
  points_frustum[7].z = far_z
end