C++ Technique::setSceneBlending方法代码示例

void MeshPersonVisual::setColor(const Ogre::ColourValue& c) {
    Ogre::SceneBlendType blending;
    bool depth_write;

    if ( c.a < 0.9998 )
    {
      blending = Ogre::SBT_TRANSPARENT_ALPHA;
      depth_write = false;
    }
    else
    {
      blending = Ogre::SBT_REPLACE;
      depth_write = true;
    }

    std::set<Ogre::MaterialPtr>::iterator it;
    for( it = materials_.begin(); it != materials_.end(); it++ )
    {
      Ogre::Technique* technique = (*it)->getTechnique( 0 );

      technique->setAmbient( c.r*0.5, c.g*0.5, c.b*0.5 );
      technique->setDiffuse( c.r, c.g, c.b, c.a );
      technique->setSceneBlending( blending );
      technique->setDepthWriteEnabled( depth_write );
      technique->setLightingEnabled( true );
    }
}

//.........这里部分代码省略.........
      {
        if( (*it)->getName() != "BaseWhiteNoLighting" )
        {
          Ogre::MaterialPtr new_material = (*it)->clone( id + (*it)->getName() );
          materials_.insert( new_material );
        }
      }

      // make sub-entities use cloned materials
      for (uint32_t i = 0; i < entity_->getNumSubEntities(); ++i)
      {
        std::string mat_name = entity_->getSubEntity(i)->getMaterialName();
        if( mat_name != "BaseWhiteNoLighting" )
        {
          entity_->getSubEntity(i)->setMaterialName( id + mat_name );
        }
        else
        {
          // BaseWhiteNoLighting is the default material Ogre uses
          // when it sees a mesh with no material.  Here we replace
          // that with our default_material which gets colored with
          // new_message->color.
          entity_->getSubEntity(i)->setMaterial( default_material );
        }
      }
    }
    else
    {
      entity_->setMaterial( default_material );
    }

    context_->getSelectionManager()->removeObject(coll_);
    coll_ = context_->getSelectionManager()->createCollisionForEntity(entity_, SelectionHandlerPtr(new MarkerSelectionHandler(this, MarkerID(new_message->ns, new_message->id))), coll_);
  }

  if( need_color ||
      old_message->color.r != new_message->color.r ||
      old_message->color.g != new_message->color.g ||
      old_message->color.b != new_message->color.b ||
      old_message->color.a != new_message->color.a )
  {
    float r = new_message->color.r;
    float g = new_message->color.g;
    float b = new_message->color.b;
    float a = new_message->color.a;

    // Old way was to ignore the color and alpha when using embedded
    // materials, which meant you could leave them unset, which means
    // 0.  Since we now USE the color and alpha values, leaving them
    // all 0 will mean the object will be invisible.  Therefore detect
    // the situation where RGBA are all 0 and treat that the same as
    // all 1 (full white).
    if( new_message->mesh_use_embedded_materials && r == 0 && g == 0 && b == 0 && a == 0 )
    {
      r = 1; g = 1; b = 1; a = 1;
    }

    Ogre::SceneBlendType blending;
    bool depth_write;

    if ( a < 0.9998 )
    {
      blending = Ogre::SBT_TRANSPARENT_ALPHA;
      depth_write = false;
    }
    else
    {
      blending = Ogre::SBT_REPLACE;
      depth_write = true;
    }

    S_MaterialPtr::iterator it;
    for( it = materials_.begin(); it != materials_.end(); it++ )
    {    
      Ogre::Technique* technique = (*it)->getTechnique( 0 );

      technique->setAmbient( r*0.5, g*0.5, b*0.5 );
      technique->setDiffuse( r, g, b, a );
      technique->setSceneBlending( blending );
      technique->setDepthWriteEnabled( depth_write );
    }
  }

  Ogre::Vector3 pos, scale;
  Ogre::Quaternion orient;
  transform(new_message, pos, orient, scale);

  scene_node_->setVisible(true);
  setPosition(pos);
  setOrientation(orient);

  // In Ogre, mesh surface normals are not normalized if object is not
  // scaled.  This forces the surface normals to be renormalized by
  // invisibly tweaking the scale.
  if( scale.x == 1.0 && scale.y == 1.0 && scale.z == 1.0 )
  {
    scale.z = 1.0001;
  }
  scene_node_->setScale(scale);
}

//.........这里部分代码省略.........
    default_material->setReceiveShadows(false);
    default_material->getTechnique(0)->setLightingEnabled(true);
    default_material->getTechnique(0)->setAmbient(0.5, 0.5, 0.5);

    materials_.insert(default_material);

    if (new_message->mesh_use_embedded_materials)
    {
      // make clones of all embedded materials so selection works correctly
      S_MaterialPtr materials = getMaterials();

      S_MaterialPtr::iterator it;
      for (it = materials.begin(); it != materials.end(); it++)
      {
        if ((*it)->getName() != "BaseWhiteNoLighting")
        {
          Ogre::MaterialPtr new_material = (*it)->clone(id + (*it)->getName());
          materials_.insert(new_material);
        }
      }

      // make sub-entities use cloned materials
      for (uint32_t i = 0; i < entity_->getNumSubEntities(); ++i)
      {
        std::string mat_name = entity_->getSubEntity(i)->getMaterialName();
        if (mat_name != "BaseWhiteNoLighting")
        {
          entity_->getSubEntity(i)->setMaterialName(id + mat_name);
        }
        else
        {
          // BaseWhiteNoLighting is the default material Ogre uses
          // when it sees a mesh with no material.  Here we replace
          // that with our default_material which gets colored with
          // new_message->color.
          entity_->getSubEntity(i)->setMaterial(default_material);
        }
      }
    }
    else
    {
      entity_->setMaterial(default_material);
    }

   

    // always update color on resource change
    update_color = true;

    handler_.reset(new MarkerSelectionHandler(this, MarkerID(new_message->ns, new_message->id), context_));
    handler_->addTrackedObject(entity_);
  }
  else
  {
    // underlying mesh resource has not changed but if the color has
    //  then we need to update the materials color
    if (!old_message
        || old_message->color.r != new_message->color.r
        || old_message->color.g != new_message->color.g
        || old_message->color.b != new_message->color.b
        || old_message->color.a != new_message->color.a)
    {
      update_color = true;
    }
  }

  // update material color
  //  if the mesh_use_embedded_materials is true and color is non-zero
  //  then the color will be used to tint the embedded materials
  if (update_color)
  { 
    if( new_message->mesh_use_embedded_materials && r == 0 && g == 0 && b == 0 && a == 0 )
    {
    blending = Ogre::SBT_REPLACE;
    depth_write = true;
    r = 1; g = 1; b = 1; a = 1;
    }
    S_MaterialPtr::iterator material_it;
    for (material_it = materials_.begin(); material_it != materials_.end(); material_it++)
    {
      Ogre::Technique* technique = (*material_it)->getTechnique(0);
      technique->setAmbient( r*0.5, g*0.5, b*0.5 );
      technique->setDiffuse( r, g, b, a );
      technique->setSceneBlending( blending );
      technique->setDepthWriteEnabled( depth_write );
      technique->setLightingEnabled( true );
    }
   
  }

  Ogre::Vector3 pos, scale;
  Ogre::Quaternion orient;
  transform(new_message, pos, orient, scale);

  scene_node_->setVisible(true);
  setPosition(pos);
  setOrientation(orient);

  scene_node_->setScale(scale);
}