From 0143c65f2f968d5b8b772018fa0c0270036727e1 Mon Sep 17 00:00:00 2001
From: lmj01 <lmj01@users.noreply.github.com>
Date: Mon, 30 May 2022 18:07:41 +0800
Subject: [PATCH] Create Raycast.md

---
 docs/mj/Raycast.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 docs/mj/Raycast.md

diff --git a/docs/mj/Raycast.md b/docs/mj/Raycast.md
new file mode 100644
index 00000000000000..bbaf9efa746ec7
--- /dev/null
+++ b/docs/mj/Raycast.md
@@ -0,0 +1,20 @@
+# Raycast
+
+射线用来求交的
+
+```js
+class Object3D extends EventDispatcher {
+    raycast( /* raycaster, intersects */ ) {}
+}
+class Raycaster {
+
+}
+```
+要想进行拾取操作，就需要实现raycast，新的对象要继承Object3D并实现它，就可以通过Raycaster测试相交
+内部支持的类型有
+Points,
+Line,
+Sprite,
+Mesh,
+InstancedMesh,
+LOD,