public ColorRGBA set(float r, float g, float b, float a) {
        this.r = r;
        this.g = g;
        this.b = b;
        this.a = a;
        return this;
    }
<code>set</code> sets the RGBA values of this <code>ColorRGBA</code>.
these values are assumed to be in linear space and stored as is.
If you want to assign sRGB values use
{@link ColorRGBA#setAsSrgb(float, float, float, float) }

@param r The red component of this color.
@param g The green component of this color.
@param b The blue component of this color.
@param a The alpha component of this color.
@return this
jme3-core/src/main/java/com/jme3/math/ColorRGBA.java