Why my sharp edges become smooth ?

[shivaroma]

Hi everyone

I am using 3Ds Max 2013 with Vray 2.30.01 and I have aasigend Vray as renderer naturally.

production and material editor renderer= vray 2.30.01 adv

activeshade:vray RT 2.30.02

 

I am modeling some cristals like quartz and Diamond.I created a box,turned it to editable poly,tasselated it with face and then I selected the vertex in the center of the cross on one of my box sides and moved it upwards.it must have created a pyramid instead it is more like a cone,I tried turn smooth results off,add crease and everything I found on youtube but cant understand why it happens.

 

please help...