diff --git a/src/core/Camera.ts b/src/core/Camera.ts
index 7836a34..2a5c6a8 100644
--- a/src/core/Camera.ts
+++ b/src/core/Camera.ts
@@ -9,9 +9,14 @@ interface ThreeInterface {
 export default defineComponent({
   // TODO: eventually extend Object3D
   // extends: Object3D,
-  // inject: ['three'], // don't work with typescript, bug ?
+
+  // don't work with typescript, bug ?
+  // but works in sub components (injection, not typescript)
+  inject: ['three'],
+
   setup() {
-    // this works in sub component ??
+    // this works with typescript in sub component
+    // but setup is not called
     const three = inject('three') as ThreeInterface
     return { three }
   },
diff --git a/src/core/OrthographicCamera.ts b/src/core/OrthographicCamera.ts
index 0d72c47..f66ea59 100644
--- a/src/core/OrthographicCamera.ts
+++ b/src/core/OrthographicCamera.ts
@@ -6,7 +6,6 @@ import Camera from './Camera'
 export default defineComponent({
   extends: Camera,
   name: 'OrthographicCamera',
-  inject: ['three'],
   props: {
     left: { type: Number, default: -1 },
     right: { type: Number, default: 1 },
diff --git a/src/core/PerspectiveCamera.ts b/src/core/PerspectiveCamera.ts
index a353cc2..b37e2b5 100644
--- a/src/core/PerspectiveCamera.ts
+++ b/src/core/PerspectiveCamera.ts
@@ -6,7 +6,6 @@ import Camera from './Camera'
 export default defineComponent({
   extends: Camera,
   name: 'PerspectiveCamera',
-  inject: ['three'],
   props: {
     aspect: { type: Number, default: 1 },
     far: { type: Number, default: 2000 },