private boolean isValidNumber(Vector2f v) {
        return isValidNumber(v.x) && isValidNumber(v.y);
    }
Update the location of the specified Uniform in the specified Shader.

@param shader the Shader containing the Uniform (not null)
@param uniform the Uniform to update (not null)
jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java