refactor(build-material): improve structure

packages/three-mmd-r3f/src/hooks/use-mmd.ts

@@ -1,7 +1,18 @@
+import type { MMDLoaderPlugin } from '@moeru/three-mmd'
+
 import { MMDLoader } from '@moeru/three-mmd'
 import { useLoader } from '@react-three/fiber'
 
-const useMMD = (path: string) => useLoader(MMDLoader, path)
+const useMMD = (path: string, plugins?: MMDLoaderPlugin[]) => useLoader(
+  MMDLoader,
+  path,
+  (loader) => {
+    plugins?.forEach(
+      p => loader.register(p),
+    )
+  },
+
+)
 
 // eslint-disable-next-line @masknet/no-top-level
 useMMD.preload = (path: string) =>

packages/three-mmd/src/materials/mmd-toon-material.ts

@@ -8,11 +8,11 @@
   UniformsUtils,
 } from 'three'
 
-import { MMDToonShader } from '../shaders/mmd-toon-shader'
+import { MMDToonShader } from '../loaders/shaders/mmd-toon-shader'
 
 export class MMDToonMaterial extends ShaderMaterial {
   combine: number
   // TODO: emissive declared in MaterialJSON but not where can be
   // found under ShaderMaterial nor Material, but mentioned as
   // https://github.com/mrdoob/three.js/issues/28336, setting
   // emissive for colored textures was required.