update makefile

Makefile

@@ -1,27 +1,21 @@
-mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
-current_dir := $(dir $(mkfile_path))
-parent_dir := $(abspath $(dir $(lastword $(MAKEFILE_LIST)))/..)
-
-filament_build_out := $(parent_dir)/filament/out/cmake-release
-
 # building on MacOS, we currently just delete the macos/include 
 # and macos/src directories and copy from iOS
-
 sync-macos: FORCE
 	rm -rf ${current_dir}macos/include ${current_dir}macos/src 
 	cp -R ${current_dir}ios/include ${current_dir}macos
 	cp -R ${current_dir}ios/src ${current_dir}macos
 
+# We compile a small set of custom materials for various helpers (background image, gizmo, etc)
+# You must specify the `FILAMENT_PATH` environment variable, either the path /out/release
+# eg: FILAMENT_PATH=/path/to/filament/out/release/bin make materials
+# 
+materials: FORCE
+	@echo "Using Filament build from ${FILAMENT_PATH}"
+	${FILAMENT_PATH}/matc -a opengl -a metal -o materials/image.filamat materials/image.mat
+	$(FILAMENT_PATH)/resgen -c -p image -x ios/include/material/ materials/image.filamat   
+	$(FILAMENT_PATH)/matc -a opengl -a metal -o materials/gizmo.filamat materials/gizmo.mat
+	$(FILAMENT_PATH)/resgen -c -p gizmo -x ios/include/material/ materials/gizmo.filamat
+	#rm materials/*.filamat
+
 FORCE: ;
 
-# We use a single material (no lighting and no transparency) for background images
-# 
-# by default this assumes you have built filament in a sibling folder
-# you may customize the out folder by speicifying `filament_build_out`
-# 
-# eg: make generate-background-material filament_build_out=/filament/out/release
-# 
-generate-background-material:
-	${filament_build_out}/tools/matc/matc -a opengl -a metal -o materials/image.filamat materials/image.mat
-	${filament_build_out}/tools/resgen/resgen -c -p image -x ios/include/material/ materials/image.filamat   
-	rm materials/image.filamat