Quaternion and angle helpers, updated example

src/data/Quaternion.ts

@@ -41,6 +41,27 @@ export class Quaternion {
 		return new Quaternion(0, 0, 0, 1);
 	}
 
+	static fromRotationXY(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		const c = Math.cos(halfAngleRad);
+		const s = Math.sin(halfAngleRad);
+		return new Quaternion(0, 0, s, c);
+	}
+
+	static fromRotationYZ(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		const c = Math.cos(halfAngleRad);
+		const s = Math.sin(halfAngleRad);
+		return new Quaternion(s, 0, 0, c);
+	}
+
+	static fromRotationZX(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		const c = Math.cos(halfAngleRad);
+		const s = Math.sin(halfAngleRad);
+		return new Quaternion(0, s, 0, c);
+	}
+
 	setObject(object: QuaternionObject): Quaternion {
 		this.x = object.x;
 		this.y = object.y;
@@ -64,6 +85,33 @@ export class Quaternion {
 		this.w = 1;
 		return this;
 	}
+
+	setRotationXY(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		this.x = 0;
+		this.y = 0;
+		this.z = Math.sin(halfAngleRad);
+		this.w = Math.cos(halfAngleRad);
+		return this;
+	}
+
+	setRotationYZ(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		this.x = Math.sin(halfAngleRad);
+		this.y = 0;
+		this.z = 0;
+		this.w = Math.cos(halfAngleRad);
+		return this;
+	}
+
+	setRotationZX(angleRad: number): Quaternion {
+		const halfAngleRad = 0.5 * angleRad;
+		this.x = 0;
+		this.y = Math.sin(halfAngleRad);
+		this.z = 0;
+		this.w = Math.cos(halfAngleRad);
+		return this;
+	}
 }
 
 Object.defineProperty(Quaternion.prototype, "type", { value: "Quaternion" });

src/geometry.ts

@@ -0,0 +1,7 @@
+export function degToRad(angleDeg: number): number {
+	return angleDeg * Math.PI / 180;
+}
+
+export function radToDeg(angleRad: number): number {
+	return angleRad * 180 / Math.PI;
+}

src/oktaeder.ts

@@ -5,6 +5,7 @@
  */
 
 export * from "./_BinaryWriter";
+export * from "./geometry";
 export * from "./shader";
 
 import { _BinaryWriter as BinaryWriter } from "./_BinaryWriter";