at least now I know which part is to be patched...

src/net/torvald/terrarum/TitleScreen.kt

@@ -109,6 +109,8 @@ class TitleScreen(val batch: SpriteBatch) : Screen {
     val uiContainer = ArrayList<UICanvas>()
     private lateinit var uiMenu: UICanvas
 
+    private lateinit var worldFBO: FrameBuffer
+
     private fun loadThingsWhileIntroIsVisible() {
         demoWorld = ReadLayerData(FileInputStream(ModMgr.getFile("basegame", "demoworld")))
 
@@ -166,6 +168,9 @@ class TitleScreen(val batch: SpriteBatch) : Screen {
 
 
         Gdx.input.inputProcessor = TitleScreenController(this)
+
+
+        worldFBO = FrameBuffer(Pixmap.Format.RGBA8888, Terrarum.WIDTH, Terrarum.HEIGHT, false)
     }
 
     private var blurWriteBuffer = lightmapFboA
@@ -224,12 +229,28 @@ class TitleScreen(val batch: SpriteBatch) : Screen {
         //camera.setToOrtho(true, Terrarum.WIDTH.toFloat(), Terrarum.HEIGHT.toFloat())
 
         // render world
-        Gdx.gl.glClearColor(.64f, .754f, .84f, 0f)
+        Gdx.gl.glClearColor(.64f, .754f, .84f, 1f)
         Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT)
-        BlocksDrawer.renderWall(batch)
-        BlocksDrawer.renderTerrain(batch)
+
+        //BlocksDrawer.renderWall(batch)
+        //BlocksDrawer.renderTerrain(batch)
         //BlocksDrawer.renderFront(batch, false)
 
+
+        batch.inUse {
+            setCameraPosition(0f, 0f)
+            batch.shader = null
+
+            Gdx.gl.glEnable(GL20.GL_BLEND)
+            renderDemoWorld()
+
+            batch.shader = null
+            batch.color = Color.WHITE
+            renderMenus()
+            //renderOverlayTexts()
+        }
+
+
         /*batch.inUse {
             setCameraPosition(0f, 0f)
             batch.color = Color.WHITE
@@ -261,26 +282,13 @@ class TitleScreen(val batch: SpriteBatch) : Screen {
 
         // draw tiles //
 
-        // using custom code for camera; this is obscure and tricky
-        camera.position.set(WorldCamera.gdxCamX, WorldCamera.gdxCamY, 0f) // make camara work
-        camera.update()
-        batch.projectionMatrix = camera.combined
-        batch.shader = null
-
         blendNormal()
 
-        batch.end()
-
-
 
         BlocksDrawer.renderWall(batch)
         BlocksDrawer.renderTerrain(batch)
-        BlocksDrawer.renderFront(batch, false)
 
 
-
-        batch.begin()
-
         FeaturesDrawer.drawEnvOverlay(batch)