Wintermute Engine Forum

Wintermute Engine => Scripts, plugins, utilities, goodies => Topic started by: falcomus on October 27, 2012, 10:10:32 PM

Title: Lightmap DLL
Post by: falcomus on October 27, 2012, 10:10:32 PM

Demo Screen: (

- Create a empty bmp, same size like your scene bmp.
- Fill it completely with color "white"
- The areas, where the actor stands in the shadow, you can paint on your lightmap in a darker gray
- If the actor for example stands in front of a fire-place, you can paint this area in the lightmap red (Easiest way to use 2 layers, Photoshop, .NET Paint etc.)

Embed the dll and call the function "GetRGB" in Game_loop.script.


external "C:\LMDLL.dll" int GetRGB(string fName, int x, int y, int buflen, string buf);

// infinite loop of game_loop.script

   //Don't call func every pixel movement

   if ( (actor.X % 5 == 0) || (actor.Y % 5 == 0) )

      //Call the dll function and receive the lightmap-color values (RGB) at actors coordinates
     GetRGB ("C:\LM.bmp", actor.X,actor.Y, str.Capacity,str);

      //Split the result value in an array (RGB-values, I did not know how to send the 3 int values back from DLL, so I used a string)

      arr = str.Split(";");

     //Change actors color corresponding to lightmap
     actor.AlphaColor = MakeRGBA(ToInt(arr[0]),ToInt(arr[1]),ToInt(arr[2]),255);


You can use gradients (black to white or lightgray) in lightmap, while the actor is walking in scene his color and brightness is changing :-)

P.S: Array and string I declared in

arr = new Array();
str = new String(100);


Because I have no webspace I can't put a link to the dll and example bmp.
If somebody likes to have the dll I'll send it to you via email


library LMDLL;


  Windows, SysUtils, Dialogs, Graphics, Classes;

{$R *.res}

function GetRGB(fName: string; x, y: integer; buflen: integer; buf: PChar): integer; stdcall;

  aBmp:   TBitmap;
  iColor: Longint;
  r,g,b:  integer;


    aBmp := TBitmap.Create;

    iColor := ColorToRGB(aBmp.Canvas.Pixels[x,y]);


  r := GetRValue(iColor);
  b := GetBValue(iColor);
  g := GetGValue(iColor);

  StrLCopy(buf, PChar(IntToStr(r) + ';' + IntToStr(g) + ';' + IntToStr(b)), buflen);

  result := 0;


exports GetRGB;


Title: Re: Lightmap DLL
Post by: piere on October 29, 2012, 12:27:41 AM
Cool ! Can you post a link to download this?
Title: Re: Lightmap DLL
Post by: keybone on December 11, 2012, 08:51:08 PM
nice! work only 2d actor?
Title: Re: Lightmap DLL
Post by: shuin on December 13, 2012, 01:59:47 PM
I haven't used WME in a while, but watching that video, isn't it the same as the engine's decoration regions?
Title: Re: Lightmap DLL
Post by: lof on December 13, 2012, 03:31:03 PM
i am guessing it is, but i get why he made this plugin, if you need to make a bunch of scenes with different lightmaps, this tool can come in handy.
no need to make regions, locate them, shape them, select color, just make an extra colored layer of the floor while designing the scene.
cheers  ::beer
Title: Re: Lightmap DLL
Post by: falcomus on March 21, 2013, 11:15:38 PM
Right, lof

To each scene you just have to make a lightmap. If you change to another scene, the corresponding Lightmap is used automatically.

Normally you define a region and when actor enters this region you can specify a color.

With the lightmap the actor changes color continuously (gradient) as he walks around.

The following code manages this

//Infinite loop

  //examine not every pixel movement of actor
  if (loop_counter > 40)
     //Build the path to the lightmap according to the current scene
     filename = Directory.CurrentDirectory +  "\Lightmaps\" + Scene.Name + "_LM.bmp";
     //Get actors color corresponding to lightmap
   if (GetActorColor(filename, actor.X,actor.Y, strRGB.Capacity,strRGB) == 0)
           //split to result in an array
      arrRGB = strRGB.Split(";");
          //set the actors alpha-color with values from lightmap
     actor.AlphaColor = MakeRGBA(ToInt(arrRGB[0]),ToInt(arrRGB[1]),ToInt(arrRGB[2]),255);

   loop_counter = 0;
  else loop_counter = loop_counter + 1;
Title: Re: Lightmap DLL
Post by: AndyT on June 30, 2014, 11:10:22 AM
I know this is a bit old topic, but i´d love to try this, is it possible to upload the .dll file somewhere or even some demo project? And if maybe the creator is no longer active in this forum, does anybody else uses this? Thanks