public ColorRGBA interpolateLocal(ColorRGBA finalColor, float changeAmount) {
        this.r = (1 - changeAmount) * this.r + changeAmount * finalColor.r;
        this.g = (1 - changeAmount) * this.g + changeAmount * finalColor.g;
        this.b = (1 - changeAmount) * this.b + changeAmount * finalColor.b;
        this.a = (1 - changeAmount) * this.a + changeAmount * finalColor.a;
        return this;
    }
Sets this <code>ColorRGBA</code> to the interpolation by changeAmount from
this to the finalColor:
this=(1-changeAmount)*this + changeAmount * finalColor

@param finalColor The final color to interpolate towards.
@param changeAmount An amount between 0.0 - 1.0 representing a percentage
change from this towards finalColor.
@return this ColorRGBA
jme3-core/src/main/java/com/jme3/math/ColorRGBA.java