What would be the simplest way to fetch lights from an scene ?

[shadmar]

Hi

 

I found out that LoadScene doesn't fetch lights automagic for me and the old tutorial uses a ProcessScene which doesn't seem to apply anymore.

 

So if my C++ snip goes like this, how do I get the scene lights (without manually creating them and positioning them), Any tip would be appreciated, thanks.

 

//Create a world
world=CreateWorld();
if (!world) {
   MessageBoxA(0,"Error","Failed to create world.",0);
   goto exitapp;
}
//Create render buffers
TBuffer gbuffer=CreateBuffer(ScreenWidth,ScreenHeight,BUFFER_COLOR|BUFFER_DEPTH|BUFFER_NORMAL);
TBuffer lightbuffer=CreateBuffer(ScreenWidth,ScreenHeight,BUFFER_COLOR|BUFFER_DEPTH);
//Create a camera
cam=CreateCamera();
CreateListener(cam);

//Load the scene
TEntity scene=LoadScene("C:/Leadwerks Engine SDK/Maps/tunnels.sbx");

//how do I fetch lights from this scene ?
//
//

[AggrorJorn]

I do it like this:

 

//Light
	    for (int k = 1; k <= LE.CountChildren(scene); k++)
	    {
		    // Get the class of the entity
		    String tempEntity = LE.GetEntityKey(LE.GetChild(scene, k), "class", "");
		    if (tempEntity == "Light")
//do stuff

[shadmar]

Thanks Aggror.

 

I only get Model and Terrain classes returned, no light when I test using that code.

I used

 

AppLog(tempEntity)

Just to print out all classes returned from the sbx.

[Roland]

Here is a part from my scene-loader class that shows how to parse lights.

 

void Scene::Load( const Char* pstrSBX )
{
    TEntity root = LoadScene( pstrSBX );
    _parse( root );
}


TEntity Scene::_parse( TEntity e )
{
   if( e == nullptr )
        return nullptr ;

   std::string cls = GetEntityKey(e, "class");

   if( cls == "Directionallight" )
        _onDirectionalLight(e);

   else if( cls == "Mesh" )
         _onMesh(e);

   int numChilds = CountChildren( e );
   for( int ii = 0; ii < numChilds; ++ii )
          _parse( GetChild(e, ii+1 ) );
   return nullptr;
}

void Scene::_onDirectionalLight( TLight e )
{
     // handle light here
}

void Scene::_onMesh( TMesh e )
{
    // handle mesh here
}

[shadmar]

Thanks, however they all show up as "Model" when using GetEntityKey and class on the tunnel.sbx scene

 

Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
Model
....

 

 

But by using "name" instead of class I can distinguish them :

 

spot_1
straight_1
fancage_1
fanblades_2
atmosphere_1
fancage_1
fanblades_2
straight_1
t_1
straight_3
switch_1
t_2
t_3
emitter_2
doorway_1
cagelight_2
cagelight_5
node_1
node_3
ambient_3
node_1
node_1
straight_3
straight_3
....

[Roland]

Using the keyword class do work. You must have done something wrong. Here is the output from the code snippet I showed when the tunnel.sbx is loaded

 

class=Pivot, name=
class=Model, name=spot_1
	class=Mesh, name=
	class=Spotlight, name=
class=Model, name=straight_1
	class=Mesh, name=U3D_MESH
class=Model, name=fancage_1
	class=Mesh, name=U3D_MESH
class=Model, name=fanblades_2
	class=Mesh, name=U3D_MESH
class=Model, name=atmosphere_1
	class=Mesh, name=
class=Model, name=fancage_1
	class=Mesh, name=U3D_MESH
class=Model, name=fanblades_2
	class=Mesh, name=U3D_MESH
class=Model, name=straight_1
	class=Mesh, name=U3D_MESH
class=Model, name=t_1
	class=Mesh, name=U3D_MESH
class=Model, name=straight_3
	class=Mesh, name=U3D_MESH
class=Model, name=switch_1
	class=Mesh, name=
class=Model, name=t_2
	class=Mesh, name=U3D_MESH
class=Model, name=t_3
	class=Mesh, name=U3D_MESH
class=Model, name=emitter_2
	class=Mesh, name=
class=Model, name=doorway_1
	class=Mesh, name=U3D_MESH
class=Model, name=cagelight_2
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=cagelight_4
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=cagelight_5
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=node_1
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=ambient_3
	class=Mesh, name=
class=Model, name=node_1
	class=Mesh, name=
class=Model, name=node_1
	class=Mesh, name=
class=Model, name=straight_3
	class=Mesh, name=U3D_MESH
class=Model, name=straight_3
	class=Mesh, name=U3D_MESH
class=Model, name=metal01_1
	class=Mesh, name=U3D_MESH
class=Model, name=metal01_1
	class=Mesh, name=U3D_MESH
class=Model, name=doorway_1
	class=Mesh, name=U3D_MESH
class=Model, name=t_10
	class=Mesh, name=U3D_MESH
class=Model, name=cagelight_15
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=hanginglight_2
	class=Mesh, name=U3D_MESH
	class=Spotlight, name=
class=Model, name=hanginglight_2
	class=Mesh, name=U3D_MESH
	class=Spotlight, name=
class=Model, name=cagelight_14
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=room01_1
	class=Mesh, name=U3D_MESH
class=Model, name=cagelight_21
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=locker_48
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=01
		class=Mesh, name=doorhinge
class=Model, name=room02_1
	class=Mesh, name=U3D_MESH
class=Model, name=hanginglight_46
	class=Mesh, name=U3D_MESH
	class=Spotlight, name=
class=Model, name=hanginglight_47
	class=Mesh, name=U3D_MESH
	class=Spotlight, name=
class=Model, name=cagelight_56
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=metal01_1
	class=Mesh, name=U3D_MESH
class=Model, name=metal01_1
	class=Mesh, name=U3D_MESH
class=Model, name=cagelight_29
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=cagelight_38
	class=Mesh, name=STATIC_MESH
		class=Mesh, name=bulb
		class=Mesh, name=cage
	class=Pointlight, name=
class=Model, name=node_1
	class=Mesh, name=
class=Model, name=node_2
	class=Mesh, name=
class=Model, name=node_3
	class=Mesh, name=
class=Model, name=node_4
	class=Mesh, name=
class=Model, name=doorway_3
	class=Mesh, name=U3D_MESH
class=Model, name=metal01_5
	class=Mesh, name=U3D_MESH
class=Model, name=metal01_6
	class=Mesh, name=U3D_MESH

 

To get the print out I just added some print code like this

 

TEntity Scene::_parse( TEntity e )
{
    if( e == nullptr )
         return nullptr ;

   // --- print
   std::ostringstream  os ;
   for( int tab=0; tab < _tab; ++tab )
            os << "    ";

   std::string cls = GetEntityKey(e, "class");
   std::string name = GetEntityKey(e,"name");

   os << "class=" << cls << ", name=" << name ;
   AppLog( os.str().c_str());
   _tab++;
  // ---

   std::string cls = GetEntityKey(e, "class");
   if( cls == "Directionallight" )
       _onDirectionalLight(e);
   else if( cls == "Mesh" )
      _onMesh(e);

   int numChilds = CountChildren( e );
   for( int ii = 0; ii < numChilds; ++ii )
       _parse( GetChild(e, ii+1 ) );
   _tab--;
    return nullptr;
}

[shadmar]

Haha, thanks alot.

I just fetched the top most one (hence all the models), I get it now, thanks for the tutorial on entities