From c5e14654472b9f90c8ba94693c5ea29a59d9c1e2 Mon Sep 17 00:00:00 2001
From: blobt <klm777x7@gmai.com>
Date: Fri, 16 Apr 2021 14:53:56 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E6=88=90vec3?=
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---
 src/render/math/Vec2.ts |   6 +-
 src/render/math/Vec3.ts | 150 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 145 insertions(+), 11 deletions(-)

diff --git a/src/render/math/Vec2.ts b/src/render/math/Vec2.ts
index 2b6baad6..78201853 100755
--- a/src/render/math/Vec2.ts
+++ b/src/render/math/Vec2.ts
@@ -1,7 +1,7 @@
 /**
  * 二维向量
  */
-export class Vec2 {
+export class vec2 {
 
     /**
      * @var 数据存储内存
@@ -33,8 +33,8 @@ export class Vec2 {
         }
     }
 
-    copy(dest: Vec2 | null = null): Vec2 {
-        if (!dest) dest = new Vec2();
+    copy(dest: vec2 | null = null): vec2 {
+        if (!dest) dest = new vec2();
         dest.x = this.x;
         dest.y = this.y;
         return dest;
diff --git a/src/render/math/Vec3.ts b/src/render/math/Vec3.ts
index 7f84698f..10654bba 100755
--- a/src/render/math/Vec3.ts
+++ b/src/render/math/Vec3.ts
@@ -1,6 +1,6 @@
 import { EPSILON } from "../common";
 
-export class Vec3 {
+export class vec3 {
     /**
      * @var
      */
@@ -50,8 +50,8 @@ export class Vec3 {
         this.z = z;
     }
 
-    public copy(dest: Vec3 | null = null): Vec3 {
-        if (!dest) dest = new Vec3();
+    public copy(dest: vec3 | null = null): vec3 {
+        if (!dest) dest = new vec3();
 
         dest.x = this.x;
         dest.y = this.y;
@@ -65,7 +65,7 @@ export class Vec3 {
      * @param dest 
      * @returns 
      */
-    public negate(dest: Vec3 | null = null): Vec3 {
+    public negate(dest: vec3 | null = null): vec3 {
         if (!dest) dest = this;
 
         dest.x = -this.x;
@@ -81,7 +81,7 @@ export class Vec3 {
      * @param threshold 
      * @returns 
      */
-    public equals(vector: Vec3, threshold = EPSILON): boolean {
+    public equals(vector: vec3, threshold = EPSILON): boolean {
         if (Math.abs(this.x - vector.x) > threshold)
             return false;
 
@@ -117,7 +117,7 @@ export class Vec3 {
      * @param vector 
      * @returns 
      */
-    add(vector: Vec3): Vec3 {
+    add(vector: vec3): vec3 {
         this.x += vector.x;
         this.y += vector.y;
         this.z += vector.z;
@@ -130,7 +130,7 @@ export class Vec3 {
      * @param vector 
      * @returns 
      */
-    subtract(vector: Vec3): Vec3 {
+    subtract(vector: vec3): vec3 {
         this.x -= vector.x;
         this.y -= vector.y;
         this.z -= vector.z;
@@ -145,7 +145,7 @@ export class Vec3 {
      * @param dest 
      * @returns 
      */
-    public scale(value: number, dest: Vec3 | null = null): Vec3 {
+    public scale(value: number, dest: vec3 | null = null): vec3 {
         if (!dest) {
             dest = this;
         } else {
@@ -158,4 +158,138 @@ export class Vec3 {
 
         return dest;
     }
+
+    /**
+     * 向量单位化
+     * @param dest 
+     * @returns 
+     */
+    public normalize(dest: vec3 | null = null): vec3 {
+        if (!dest) {
+            dest = this;
+        }
+
+        let length = this.length;
+
+        if (length === 1) {
+            return this;
+        }
+
+        if (length === 0) {
+            dest.x = 0
+            dest.y = 0;
+            dest.z = 0;
+
+            return dest;
+        }
+
+        dest.x /= length;
+        dest.y /= length;
+        dest.z /= length;
+
+        return dest;
+    }
+
+    /**
+     * 向量单位化
+     * @returns 
+     */
+    public normalize2(): number {
+        let length = this.length;
+        this.x /= length;
+        this.y /= length;
+        this.z /= length;
+        return length;
+    }
+
+    /**
+     * 向量缩放
+     * @param vector 
+     * @param value 
+     * @param dest 
+     * @returns 
+     */
+    public static multiplyScalar(vector: vec3, value: number, dest: vec3 | null = null): vec3 {
+        if (!dest) dest = new vec3();
+        dest.x *= value;
+        dest.y *= value;
+        dest.z *= value;
+        return dest;
+    }
+
+    /**
+     * 向量叉乘
+     * @param vector 
+     * @param vector2 
+     * @param dest 
+     * @returns 
+     */
+    public static cross(vector: vec3, vector2: vec3, dest: vec3 | null = null): vec3 {
+        if (!dest) dest = new vec3();
+
+        let x = vector.x,
+            y = vector.y,
+            z = vector.z;
+
+        let x2 = vector2.x,
+            y2 = vector2.y,
+            z2 = vector2.z;
+
+        dest.x = y * z2 - z * y2;
+        dest.y = z * x2 - x * z2;
+        dest.z = x * y2 - y * x2;
+
+        return dest;
+    }
+
+    /**
+     * 向量点乘
+     * @param vector 
+     * @param vector2 
+     * @returns 
+     */
+    public static dot(vector: vec3, vector2: vec3): number {
+        let x = vector.x,
+            y = vector.y,
+            z = vector.z;
+
+        let x2 = vector2.x,
+            y2 = vector2.y,
+            z2 = vector2.z;
+
+        return (x * x2 + y * y2 + z * z2);
+    }
+
+    public static sum(vector: vec3, vector2: vec3, dest: vec3 | null = null): vec3 {
+        if (!dest) dest = new vec3();
+
+        dest.x = vector.x + vector2.x;
+        dest.y = vector.y + vector2.y;
+        dest.z = vector.z + vector2.z;
+
+        return dest;
+    }
+
+    public static difference(vector: vec3, vector2: vec3, dest: vec3 | null = null): vec3 {
+        if (!dest) dest = new vec3();
+
+        dest.x = vector.x - vector2.x;
+        dest.y = vector.y - vector2.y;
+        dest.z = vector.z - vector2.z;
+
+        return dest;
+    }
+
+    static readonly up = new vec3([0, 1, 0]);
+    static readonly down = new vec3([0, -1, 0]);
+    static readonly right = new vec3([1, 0, 0]);
+    static readonly left = new vec3([-1, 0, 0]);
+    static readonly forward = new vec3([0, 0, 1]);
+    static readonly backward = new vec3([0, 0, -1]);
+
+    static readonly zero = new vec3([0, 0, 0]);
+
+    static v0 = new vec3([0, 0, 0]);
+    static v1 = new vec3([0, 0, 0]);
+    static v2 = new vec3([0, 0, 0]);
 }
\ No newline at end of file