diff --git a/Utilities/geometry.h b/Utilities/geometry.h
index 73bb502cd2..e287a7dd68 100644
--- a/Utilities/geometry.h
+++ b/Utilities/geometry.h
@@ -856,7 +856,7 @@ struct color4_base
 	{
 	}
 
-	constexpr color4_base(T x, T y = {}, T z = {}, T w = {})
+	constexpr color4_base(T x, T y, T z, T w)
 		: x(x)
 		, y(y)
 		, z(z)
@@ -864,6 +864,14 @@ struct color4_base
 	{
 	}
 
+	constexpr color4_base(T value)
+		: x(value)
+		, y(value)
+		, z(value)
+		, w(value)
+	{
+	}
+
 	constexpr bool operator == (const color4_base& rhs) const
 	{
 		return r == rhs.r && g == rhs.g && b == rhs.b && a == rhs.a;
@@ -874,6 +882,37 @@ struct color4_base
 		return !(*this == rhs);
 	}
 
+	void operator *= (const color4_base<T>& rhs)
+	{
+		r *= rhs.r;
+		g *= rhs.g;
+		b *= rhs.b;
+		a *= rhs.a;
+	}
+
+	void operator *= (const T& rhs)
+	{
+		r *= rhs;
+		g *= rhs;
+		b *= rhs;
+		a *= rhs;
+	}
+
+	constexpr color4_base<T> operator * (const color4_base<T>& rhs) const
+	{
+		return { r * rhs.r, g * rhs.g, b * rhs.b, a * rhs.a };
+	}
+
+	constexpr color4_base<T> operator * (const T& rhs) const
+	{
+		return { r * rhs, g * rhs, b * rhs, a * rhs };
+	}
+
+	constexpr color4_base<T> operator + (const color4_base<T>& rhs) const
+	{
+		return { r + rhs.r, g + rhs.g, b + rhs.b, a + rhs.a };
+	}
+
 	template<typename NT>
 	constexpr operator color4_base<NT>() const
 	{