diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTDrawable.java b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTDrawable.java
new file mode 100644
index 0000000..8b225f5
--- /dev/null
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/framework/RWT/RWTDrawable.java
@@ -0,0 +1,7 @@
+package org.ntlab.radishforandroidstudio.framework.RWT;
+
+import org.ntlab.radishforandroidstudio.java3d.GraphicsContext3D;
+
+public interface RWTDrawable {
+    public void draw(GraphicsContext3D gc3D);
+}