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#!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!N  #!Rtall213 Tangents, Normals, and Binormals 
Components #!N #!N #!N The "normals" component is used to specify 
a local surface normal for rendering purposes. The "tangents," "normals" and 
"binormals" components specify a local reference frame on a path; this 
is useful, for example, for twisted-ribbon representations of streamlines. #!N #!N 
Normals are used for, among other things, surface shading. By convention, 
the normals are expected to point out from the front of 
a surface, as defined in  #!Lcolcom,dxall207 h Colors, Front Colors, and Back Colors Components  #!EL  . Normals are expected to 
have unit length. #!N #!N #!N  #!F-adobe-times-medium-i-normal--18*   Next Topic #!EF #!N 
#!N  #!Ltall215,dxall215 h Neighbors Component  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N