Final refactorings: FastDebugDraw is now InstancedDebugDraw Added ConVar to switch between old and new system. Added UnityGLInterceptor as a base to UnityGLEmulator to intercept Unity.GL calls but avoid breaking classic DDraw. Opted for nested types instead of overly long namespace names. Exhibit proper resource management in InstancedDebugDraw as well as InstancedDebugMeshGenerator.