File:Surface normal illustration.png

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Description
العربية: الناظم على سطح منحني في نقطة ما هو نفسه الناظم على مستوي مماس عند تلك النقطة.
Bosanski: Normala na površinu u tački je isto što i normala na tangentnu ravan te površine u toj istoj tački.
Čeština: Normála k ploše v bodě je shodná s normálou k rovině tečné k dané ploše ve stejném bodě.
Deutsch: Die Oberflächennormale in einem Punkt entspricht der Normalen der Tangentenebene, welche die Oberfläche in diesem Punkt berührt.
English: A normal to a surface at a point is the same as a normal to the tangent plane to that surface at that point.
Esperanto: Surfaca normalo kaj tanĝanta ebeno.
Hrvatski: Normala na površinu.
Italiano: Una normale ad una superficie è una normale al piano tangente nel punto.
Nederlands: De normaalvector van een 3D-oppervlak in een punt is de normaalvector van het raakvlak door dat punt aan het oppervlak door dat punt.
Polski: Konstrukcja wektora normalnego do powierzchni.
Svenska: Ytnormalen i en punkt på en slät yta är normalvektorn på tangentplanet till ytan i punkten.
ไทย: ค่านอร์มอลสำหรับจุดบนพื้นผิวหาได้จากค่านอร์มอลของระนาบสัมผัสที่สัมผัสพื้นผิวตรงจุดนั้น.
Source Own work
Author Oleg Alexandrov
Other versions
File:Surface normal illustration.svg is a vector version of this file. It should be used in place of this PNG file when not inferior.
File:Surface normal illustration.png → File:Surface normal illustration.svg
For more information, see Help:SVG.
In other languages
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New SVG image

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This diagram was created with MATLAB.
Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
In some countries this may not be legally possible; if so:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Source code (MATLAB)

 

% an illustration of the surface normal

function main ()

% a few settings
   BoxSize=5;
   N=100;
   gridsize=BoxSize/N;
   lw=5;  % linewidth
   fs=35; % fontsize

% the function giving the surface and its gradient
   f=inline('10-(x.^2+y.^2)/15', 'x', 'y');
   fx=inline('-2*x/15', 'x', 'y');
   fy=inline('-2*y/15', 'x', 'y');

% calc the surface
   XX=-BoxSize:gridsize:BoxSize;
   YY=-BoxSize:gridsize:BoxSize;
   [X, Y]=meshgrid(XX, YY);
   Z=f(X, Y);

% plot the surface
   H=figure(1); clf; hold on; axis equal; axis off;
   view (-19, 14);
   surf(X, Y, Z, 'FaceColor','red', 'EdgeColor','none', ...
        'AmbientStrength', 0.3, 'SpecularStrength', 1, 'DiffuseStrength', 0.8);
   surf(X, Y, 0*Z+f(0, 0)+0.02, 'FaceColor', [0, 0, 1], 'EdgeColor','none', 'FaceAlpha', 0.4)

   camlight right; lighting phong; % make nice lightning

% the vector at the current point, as well as its tangent and normal components
   Z0=[0, 0, f(0, 0)];
   n=[fx(0, 0), fy(0, 0), 1];
   n=2*n/norm(n);

% graph the vectors
   HH=quiver3(Z0(1), Z0(2), Z0(3), n(1), n(2), n(3), 0.8); set(HH(1), 'linewidth', lw);

   set(HH(2), 'linewidth', lw)
   set(HH(2), 'XData', 0.4*[-0.78408 0 0.78408 NaN])
   set(HH(2), 'YData', 0.4*[0.78408 0 -0.78408 NaN])
   set(HH(2), 'ZData', 1*[14.824 17.2 14.824 NaN])

%  save to file
   print('-dpng',  '-r300', 'surface_normal_illustration.png');

%  This picture was tweaked in Gimp after being saved from MATLAB
%  to make the arrow look better.

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Date/TimeThumbnailDimensionsUserComment
current03:31, 22 April 2007Thumbnail for version as of 03:31, 22 April 20071,379 × 1,488 (24 KB)wikimediacommons>Oleg Alexandrov{{Information |Description= |Source= |Date= |Author= }}

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