I am a litile rusty in asm i dont think i have used it in like 1 or 2 years so bare with my.. D3DVecter o1, o2 d=sqr([o1.x^2]+[o2.x^2]+[o1.y^]+[o2.y^2]+[o1.z^2]+[o2.z^2]) i would like to make that in to a asm function this i was i think is right but i dont know ;[o1.x^2] mov eax,[o1+0] mul eax mov edx,eax ;[o2.x^2] mov eax,[o2+0] mul eax add edx,eax ;[o1.y^2] mov eax,[o1+4] mul eax add edx,eax ;[o2.y^2] mov eax,[o2+4] mul eax add edx,eax ;[o1.z^2] mov eax,[o1+8] mul eax add edx,eax ;[o2.z^2] mov eax,[o2+8] mul eax add edx,eax ;this is where i dont really know ;i have no idea how to do a sqr root in ASM ;but i need it to ret with the sqr of edx ;Thanks for the help plz dont do it in Inline ASM hehe i am useing vb and i am going to put it in to a dll with MASM or NASM (Dont really know what one will make it runn faster) sorry for the to posts IE Crashed -VBLimits Sorry about the Spelling.. Edited by - VBLimits on March 5, 2001 1:40:11 PM