thank You for your answer sir. Generally 200m*200m*200m material block I have. And I want to vary density linearly "Po+kxX+kyY+kzZ" as this equation. Where Po=2.6gm/cc; kx=0.32, ky=0.16 and kz=0.16. How may I Put this density equation on this soil block? Rafael Salehin Victor J. Аdlucky