<div>Hi Venu,</div> <div> Thanks for your suggestion.But I am asking for something else.Suppose I have a X-section whose normal n1 =(-0.25,0.75,0.3).I want to align it along n2=(0,1,0).So if I want to use vtkTransform,then to rotate along n2,I need to use RotateX,RotateY,RotateZ.That is what I asking about how can I get X,Y and Z angle.</div> <div> </div> <div>Best regards,</div> <div> </div> <div>A. N.<BR><BR><B><I>venugopal gudimetla <gudimetlav@gmail.com></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <DIV>Are you trying to find the angle between two planes? I guess you can find the cosines in each direction.</DIV> <DIV> </DIV> <DIV>in each direction :</DIV> <DIV>v1•v2 = |v1||v2| cos(angle)</DIV> <DIV>therefore cos(angle)xy = v1•v2 /|v1||v2|</DIV> <DIV>repeat this for other two directions.</DIV> <DIV>
<DIV>v1•v3 = |v1||v3| cos(angle)</DIV> <DIV>therefore cos(angle)xz = v1•v3 /|v1||v3|</DIV> <DIV> </DIV> <DIV>Thanks</DIV> <DIV>Venu</DIV><BR><BR> </DIV> <DIV><SPAN class=gmail_quote>On 1/22/07, <B class=gmail_sendername>Aina Nagma</B> <<A href="mailto:aina_nagma@yahoo.com">aina_nagma@yahoo.com</A>> wrote:</SPAN> <BLOCKQUOTE class=gmail_quote style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"> <DIV>Hi,</DIV> <DIV> I have a simple newbie question.I have two normals n1 = (-0.75,-0.5,0.25) and n2 = ( 0.5,-0.6,0.0).I want to know the angles between them separately in X,Y and Z direction.</DIV> <DIV>Can any body help me regarding this?</DIV> <DIV>Thanks in advance.</DIV><SPAN class=sg> <DIV> </DIV> <DIV>A. N.</DIV></SPAN><SPAN class=ad> <div> <HR SIZE=1> Everyone is raving about <A onclick="return top.js.OpenExtLink(window,event,this)"
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