Update default lighting settings

builtin/settingtypes.txt

@@ -512,9 +512,9 @@ zoom_fov (Field of view for zoom) int 15 7 160
 #    This setting is for the client only and is ignored by the server.
 display_gamma (Gamma) float 1.0 0.5 3.0
 
-lighting_alpha (Darkness sharpness) float 1.0 0.0 4.0
+lighting_alpha (Darkness sharpness) float 0.0 0.0 4.0
 
-lighting_beta (Lightness sharpness) float 2.0 0.0 4.0
+lighting_beta (Lightness sharpness) float 0.0 0.0 4.0
 
 #    Path to texture directory. All textures are first searched from here.
 texture_path (Texture path) path

minetest.conf.example

@@ -587,8 +587,14 @@
 
 #    Adjust the gamma encoding for the light tables. Higher numbers are brighter.
 #    This setting is for the client only and is ignored by the server.
-#    type: float min: 1 max: 3
-# display_gamma = 2.2
+#    type: float min: 0.5 max: 3.0
+# display_gamma = 1.0
+
+#    type: float min: 0.0 max: 4.0
+# lighting_alpha = 0.0
+
+#    type: float min: 0.0 max: 4.0
+# lighting_beta = 0.0
 
 #    Path to texture directory. All textures are first searched from here.
 #    type: path

src/defaultsettings.cpp

@@ -135,8 +135,8 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("leaves_style", "fancy");
 	settings->setDefault("connected_glass", "false");
 	settings->setDefault("smooth_lighting", "true");
-	settings->setDefault("lighting_alpha", "1.0");
-	settings->setDefault("lighting_beta", "2.0");
+	settings->setDefault("lighting_alpha", "0.0");
+	settings->setDefault("lighting_beta", "0.0");
 	settings->setDefault("display_gamma", "1.0");
 	settings->setDefault("texture_path", "");
 	settings->setDefault("shader_path", "");

src/settings_translation_file.cpp

@@ -245,6 +245,8 @@ fake_function() {
 	gettext("Field of view while zooming in degrees.\nThis requires the \"zoom\" privilege on the server.");
 	gettext("Gamma");
 	gettext("Adjust the gamma encoding for the light tables. Higher numbers are brighter.\nThis setting is for the client only and is ignored by the server.");
+	gettext("Darkness sharpness");
+	gettext("Lightness sharpness");
 	gettext("Texture path");
 	gettext("Path to texture directory. All textures are first searched from here.");
 	gettext("Video driver");