Color Gradiant

Hi,

I am having a 3D object.. I want to make it look very natural..
I thought applying a color gradiant would serve the purpose..

I have applied a color gradiant.. But it still doesnt look good..
Here is the code.. Can anybody please tell me what is wrong..

PHP Code:

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' MAX_PRJ_LENGTH  = max width of the object    
' C1,C2,C3 is the Center of the Object

            Zax = (Sq(1).X + Sq(2).X + Sq(3).X + Sq(4).X) \ 4
             Zax = Zax - (C1 - MAX_PRJ_LENGTH \ 2)
             Zax = Zax * 256 / MAX_PRJ_LENGTH
             If Zax < 0 Then Zax = -Zax
             
             Zay = (Sq(1).Y + Sq(2).Y + Sq(3).Y + Sq(4).Y) \ 4
             Zay = Zay - (C2 - MAX_PRJ_LENGTH \ 2)
             Zay = Zay * 256 / MAX_PRJ_LENGTH
             If Zay < 0 Then Zay = -Zay
             
             Zaz = (Zco(1) + Zco(2) + Zco(3) + Zco(4)) \ 4
             
             Zaz = Zaz - (C3 - MAX_PRJ_LENGTH \ 2)
             Zaz = Zaz * 256 / MAX_PRJ_LENGTH
             If Zaz < 0 Then Zaz = -Zaz
             
             
             myColor = RGB(Zax, Zay, Zaz) 


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Thanks in advance,
Pradeep