diff --git a/source/engine/main.js b/source/engine/main.js
index d970355..a830233 100644
--- a/source/engine/main.js
+++ b/source/engine/main.js
@@ -44,7 +44,7 @@ import { ArrayBufferToUtf8String, ArrayBufferToAsciiString, AsciiStringToArrayBu
 import { SetExternalLibLocation, GetExternalLibPath, LoadExternalLibrary } from './io/externallibs.js';
 import { GetFileName, GetFileExtension, RequestUrl, ReadFile, TransformFileHostUrls, IsUrl, FileSource, FileFormat } from './io/fileutils.js';
 import { TextWriter } from './io/textwriter.js';
-import { RGBColor, RGBAColor, ColorComponentFromFloat, ColorComponentToFloat, RGBColorFromFloatComponents, SRGBToLinear, LinearToSRGB, IntegerToHexString, RGBColorToHexString, RGBAColorToHexString, HexStringToRGBColor, ArrayToRGBColor, RGBColorIsEqual } from './model/color.js';
+import { RGBColor, RGBAColor, ColorComponentFromFloat, ColorComponentToFloat, RGBColorFromFloatComponents, SRGBToLinear, LinearToSRGB, IntegerToHexString, RGBColorToHexString, RGBAColorToHexString, HexStringToRGBColor, HexStringToRGBAColor, ArrayToRGBColor, RGBColorIsEqual } from './model/color.js';
 import { GeneratorParams, Generator, GeneratorHelper, GenerateCuboid, GenerateCone, GenerateCylinder, GenerateSphere, GeneratePlatonicSolid } from './model/generator.js';
 import { TextureMap, MaterialBase, FaceMaterial, PhongMaterial, PhysicalMaterial, TextureMapIsEqual, TextureIsEqual, MaterialType } from './model/material.js';
 import { Mesh } from './model/mesh.js';
@@ -213,6 +213,7 @@ export {
     RGBColorToHexString,
     RGBAColorToHexString,
     HexStringToRGBColor,
+    HexStringToRGBAColor,
     ArrayToRGBColor,
     RGBColorIsEqual,
     GeneratorParams,
diff --git a/source/engine/model/color.js b/source/engine/model/color.js
index a651707..73d7afd 100644
--- a/source/engine/model/color.js
+++ b/source/engine/model/color.js
@@ -157,6 +157,22 @@ export function HexStringToRGBColor (hexString)
     return new RGBColor (r, g, b);
 }
 
+export function HexStringToRGBAColor (hexString)
+{
+    if (hexString.length !== 6 && hexString.length !== 8) {
+        return null;
+    }
+
+    let r = parseInt (hexString.substring (0, 2), 16);
+    let g = parseInt (hexString.substring (2, 4), 16);
+    let b = parseInt (hexString.substring (4, 6), 16);
+    let a = 255;
+    if (hexString.length === 8) {
+        a = parseInt (hexString.substring (6, 8), 16);
+    }
+    return new RGBAColor (r, g, b, a);
+}
+
 export function ArrayToRGBColor (arr)
 {
 	return new RGBColor (arr[0], arr[1], arr[2]);
diff --git a/test/tests/model_test.js b/test/tests/model_test.js
index 00175da..828897c 100644
--- a/test/tests/model_test.js
+++ b/test/tests/model_test.js
@@ -229,12 +229,25 @@ describe ('Color Conversion', function () {
         assert.ok (!OV.RGBColorIsEqual (new OV.RGBColor (10, 20, 30), new OV.RGBColor (10, 20, 31)));
     });
 
-    it ('Color hex string conversion', function () {
+    it ('RGB Color hex string conversion', function () {
         let color = new OV.RGBColor (10, 20, 30);
         let hexString = '0a141e';
         assert.strictEqual (OV.RGBColorToHexString (color), hexString);
         assert.deepStrictEqual (OV.HexStringToRGBColor (hexString), color);
     });
+
+    it ('RGBA Color hex string conversion', function () {
+        let color = new OV.RGBAColor (10, 20, 30, 40);
+        let hexString = '0a141e28';
+        assert.strictEqual (OV.RGBAColorToHexString (color), hexString);
+        assert.deepStrictEqual (OV.HexStringToRGBAColor (hexString), color);
+
+        let color2 = new OV.RGBAColor (10, 20, 30, 255);
+        let hexString2 = '0a141e';
+        let hexString2a = '0a141eff';
+        assert.strictEqual (OV.RGBAColorToHexString (color2), hexString2a);
+        assert.deepStrictEqual (OV.HexStringToRGBAColor (hexString2), color2);
+    });
 });
 
 describe ('Node Hierarchy', function () {