diff --git a/sandbox/embed_selfhost_errors.html b/sandbox/embed_selfhost_errors.html
index c40776e..dfab787 100644
--- a/sandbox/embed_selfhost_errors.html
+++ b/sandbox/embed_selfhost_errors.html
@@ -9,7 +9,7 @@
 
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
 
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -67,7 +67,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 
     <script type='text/javascript'>
         OV.Init3DViewerElements ();
diff --git a/sandbox/embed_selfhost_externallibs.html b/sandbox/embed_selfhost_externallibs.html
index cb168b8..f91bbb4 100644
--- a/sandbox/embed_selfhost_externallibs.html
+++ b/sandbox/embed_selfhost_externallibs.html
@@ -9,7 +9,7 @@
 
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
 
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -67,7 +67,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 
     <script type='text/javascript'>
         OV.ExternalLibLocation = '../../libs';
diff --git a/sandbox/embed_selfhost_fullscreen.html b/sandbox/embed_selfhost_fullscreen.html
index a795c97..7be1daf 100644
--- a/sandbox/embed_selfhost_fullscreen.html
+++ b/sandbox/embed_selfhost_fullscreen.html
@@ -8,7 +8,7 @@
     <title>Online 3D Viewer</title>
     
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -66,7 +66,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 
     <script type='text/javascript'>
         OV.Init3DViewerElements ();
diff --git a/sandbox/embed_selfhost_manual.html b/sandbox/embed_selfhost_manual.html
index 8666315..0b7c00a 100644
--- a/sandbox/embed_selfhost_manual.html
+++ b/sandbox/embed_selfhost_manual.html
@@ -9,7 +9,7 @@
 
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
 
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -67,7 +67,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 
     <style>
         div
diff --git a/sandbox/embed_selfhost_multiple.html b/sandbox/embed_selfhost_multiple.html
index fbbcdf9..783d62b 100644
--- a/sandbox/embed_selfhost_multiple.html
+++ b/sandbox/embed_selfhost_multiple.html
@@ -9,7 +9,7 @@
 
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
 
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -67,7 +67,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 
     <script type='text/javascript'>
         OV.Init3DViewerElements (function (viewers) {
diff --git a/sandbox/embed_selfhost_single.html b/sandbox/embed_selfhost_single.html
index 204e84a..575dd9d 100644
--- a/sandbox/embed_selfhost_single.html
+++ b/sandbox/embed_selfhost_single.html
@@ -8,7 +8,7 @@
     <title>Online 3D Viewer</title>
     
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -66,7 +66,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
     <script type='text/javascript'>
         OV.Init3DViewerElements ();
     </script>
diff --git a/sandbox/embed_selfhost_single_scroll.html b/sandbox/embed_selfhost_single_scroll.html
index eadc059..1aa9cf7 100644
--- a/sandbox/embed_selfhost_single_scroll.html
+++ b/sandbox/embed_selfhost_single_scroll.html
@@ -8,7 +8,7 @@
     <title>Online 3D Viewer</title>
     
     <script type="text/javascript" src="../../libs/three.min-129.js"></script>
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -66,7 +66,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
     <script type='text/javascript'>
         OV.Init3DViewerElements ();
     </script>
diff --git a/test/utils/importall.js b/test/utils/importall.js
index 64c38c7..8c24be7 100644
--- a/test/utils/importall.js
+++ b/test/utils/importall.js
@@ -2,9 +2,9 @@ var path = require ('path');
 var rewire = require ('rewire');
 
 var config = require ('../../tools/config.json')
-var importerFiles = config['importer_files'];
+var engineFiles = config['engine_files'];
 var fileIndex, filePath;
-for (fileIndex = 0; fileIndex < importerFiles.length; fileIndex++) {
-    filePath = importerFiles[fileIndex];
+for (fileIndex = 0; fileIndex < engineFiles.length; fileIndex++) {
+    filePath = engineFiles[fileIndex];
     rewire (path.join ('..', '..', filePath));
 }
diff --git a/tools/config.json b/tools/config.json
index 555e28c..a092ad5 100644
--- a/tools/config.json
+++ b/tools/config.json
@@ -3,7 +3,7 @@
 		"libs/jquery-3.5.1.min.js",
 		"libs/three.min-129.js"
 	],
-	"importer_files" : [
+	"engine_files" : [
 		"source/core/core.js",
 		"source/core/taskrunner.js",
 		"source/geometry/geometry.js",
diff --git a/tools/create_package.py b/tools/create_package.py
index 7244fd6..cc7cef2 100644
--- a/tools/create_package.py
+++ b/tools/create_package.py
@@ -69,7 +69,7 @@ def CreateDestinationDir (config, rootDir, websiteDir, version, testBuild):
 		htmlFilePath = os.path.join (websiteDir, htmlFileName)
 		replacer = Tools.TokenReplacer (htmlFilePath, False)
 		replacer.ReplaceTokenFileLinks ('<!-- libs start -->', '<!-- libs end -->', libFiles, None)
-		replacer.ReplaceTokenFileLinks ('<!-- importer start -->', '<!-- importer end -->', importerFiles, version)
+		replacer.ReplaceTokenFileLinks ('<!-- engine start -->', '<!-- engine end -->', importerFiles, version)
 		replacer.ReplaceTokenFileLinks ('<!-- website start -->', '<!-- website end -->', websiteFiles, version)
 		externalScriptContent = ''
 		externalScriptContent += '<script type="text/javascript">' + replacer.eolChar
@@ -157,7 +157,7 @@ def Main (argv):
 	CreateDestinationDir (config, rootDir, websiteDir, version, testBuild)
 
 	PrintInfo ('Compress importer sources.')
-	compressResult = CompressFiles (config['importer_files'], os.path.join (websiteDir, 'o3dv', 'o3dv.min.js'))
+	compressResult = CompressFiles (config['engine_files'], os.path.join (websiteDir, 'o3dv', 'o3dv.min.js'))
 	if not compressResult:
 		PrintError ('Compress importer sources failed.')
 		return 1
diff --git a/tools/update_includes.py b/tools/update_includes.py
index e032b03..82d712e 100644
--- a/tools/update_includes.py
+++ b/tools/update_includes.py
@@ -27,10 +27,10 @@ def Main (argv):
 		htmlFilePath = os.path.join (rootDir, htmlFileName)
 		replacer = Tools.TokenReplacer (htmlFilePath, True)
 		libFiles = Tools.CreateFileList (config['lib_files'], 'libs/', '../libs/')
-		importerFiles = Tools.CreateFileList (config['importer_files'], 'source/', '../source/')
+		importerFiles = Tools.CreateFileList (config['engine_files'], 'source/', '../source/')
 		websiteFiles = Tools.CreateFileList (config['website_files'], 'website/', '')
 		replacer.ReplaceTokenFileLinks ('<!-- libs start -->', '<!-- libs end -->', libFiles, None)
-		replacer.ReplaceTokenFileLinks ('<!-- importer start -->', '<!-- importer end -->', importerFiles, None)
+		replacer.ReplaceTokenFileLinks ('<!-- engine start -->', '<!-- engine end -->', importerFiles, None)
 		replacer.ReplaceTokenFileLinks ('<!-- website start -->', '<!-- website end -->', websiteFiles, None)
 		replacer.WriteToFile (htmlFilePath)
 
@@ -40,8 +40,8 @@ def Main (argv):
 			continue
 		htmlFilePath = os.path.join (sandboxFolder, htmlFileName)
 		replacer = Tools.TokenReplacer (htmlFilePath, True)
-		importerFiles = Tools.CreateFileList (config['importer_files'], 'source/', '../source/')
-		replacer.ReplaceTokenFileLinks ('<!-- importer start -->', '<!-- importer end -->', importerFiles, None)
+		importerFiles = Tools.CreateFileList (config['engine_files'], 'source/', '../source/')
+		replacer.ReplaceTokenFileLinks ('<!-- engine start -->', '<!-- engine end -->', importerFiles, None)
 		replacer.WriteToFile (htmlFilePath)
 		
 	return 0
diff --git a/website/embed.html b/website/embed.html
index 3945c00..a417955 100644
--- a/website/embed.html
+++ b/website/embed.html
@@ -16,7 +16,7 @@
 	<script type="text/javascript" src="../libs/three.min-129.js"></script>
 	<!-- libs end -->
 	
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -74,7 +74,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 	
 	<!-- website start -->
 	<script type="text/javascript" src="o3dv/featureset.js"></script>
diff --git a/website/index.html b/website/index.html
index 4671872..3c9c879 100644
--- a/website/index.html
+++ b/website/index.html
@@ -16,7 +16,7 @@
 	<!-- meta start -->
 	<!-- meta end -->
 
-	<!-- importer start -->
+	<!-- engine start -->
 	<script type="text/javascript" src="../source/core/core.js"></script>
 	<script type="text/javascript" src="../source/core/taskrunner.js"></script>
 	<script type="text/javascript" src="../source/geometry/geometry.js"></script>
@@ -74,7 +74,7 @@
 	<script type="text/javascript" src="../source/viewer/navigation.js"></script>
 	<script type="text/javascript" src="../source/viewer/viewer.js"></script>
 	<script type="text/javascript" src="../source/viewer/domviewer.js"></script>
-	<!-- importer end -->
+	<!-- engine end -->
 	
 	<!-- website start -->
 	<script type="text/javascript" src="o3dv/featureset.js"></script>