public ColorRGBA set(ColorRGBA rgba) {
        if (rgba == null) {
            r = 0;
            g = 0;
            b = 0;
            a = 0;
        } else {
            r = rgba.r;
            g = rgba.g;
            b = rgba.b;
            a = rgba.a;
        }
        return this;
    }
<code>set</code> sets the values of this <code>ColorRGBA</code> to those
set by a parameter color.

@param rgba The color to set this <code>ColorRGBA</code> to.
@return this
jme3-core/src/main/java/com/jme3/math/ColorRGBA.java