Fix physics

shared/src/helper/mix-rgb.ts

@@ -0,0 +1,12 @@
+import { vec3 } from 'gl-matrix';
+import { clamp01 } from './clamp';
+import { mix } from './mix';
+
+export const mixRgb = (a: vec3, b: vec3, q: number): vec3 => {
+  const clampedQ = clamp01(q);
+  return vec3.fromValues(
+    mix(a[0], b[0], clampedQ),
+    mix(a[1], b[1], clampedQ),
+    mix(a[2], b[2], clampedQ),
+  );
+};

shared/src/helper/random.ts

@@ -9,6 +9,19 @@ export abstract class Random {
     Random._seed = value;
   }
 
+  public static choose<T>(values: Array<T>): T | undefined {
+    const to = values.length;
+    if (to === 0) {
+      return undefined;
+    }
+
+    return values[Math.floor(this.getRandomInRange(0, to))];
+  }
+
+  public static getRandomInRange(from: number, to: number): number {
+    return from + this.getRandom() * (to - from);
+  }
+
   public static getRandom(): number {
     let t = (Random._seed += 0x6d2b79f5);
     t = Math.imul(t ^ (t >>> 15), t | 1);

shared/src/helper/rgb.ts

@@ -0,0 +1,3 @@
+import { vec3 } from 'gl-matrix';
+
+export const rgb = (r: number, g: number, b: number): vec3 => vec3.fromValues(r, g, b);

shared/src/helper/rgb255.ts

@@ -0,0 +1,4 @@
+import { vec3 } from 'gl-matrix';
+
+export const rgb255 = (r: number, g: number, b: number): vec3 =>
+  vec3.fromValues(r / 255, g / 255, b / 255);