Add reset envmap button

paint/sources/project.ts

@@ -301,6 +301,7 @@ function project_set_default_envmap() {
 	scene_world._.radiance_mipmaps = context_raw.default_radiance_mipmaps;
 	scene_world._.irradiance = context_raw.default_irradiance;
 	scene_world.strength = 4.0;
+	context_raw.envmap_angle = 0.0;
 }
 
 function project_import_material() {

paint/sources/ui_menubar.ts

@@ -357,6 +357,10 @@ function ui_menubar_draw_category_items() {
 			context_raw.ddirty = 2;
 		}
 
+		if (ui_menu_button(tr("Reset Envmap"))) {
+			project_set_default_envmap();
+		}
+
 		context_update_envmap();
 
 		if (ui.changed) {