How to make a 3D object out of a surface
in [Matlab]
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From: Walter Roberson on 31 May 2010 19:05 Hane wrote: >> >> Hane wrote: >> >> >> >> > I am trying to generate a 3D object to use in a CAD tool. The >> object >> is > a cube with a random surface on top of that as one of >> its faces. >> I > already generated the random surface usig surf >> command. I should >> only > close the surface like a cube (vertically >> and horizontally) and >> make it > 3D but I do not know HOW? > Thanks for your help. I could generate a box around my random surface > but I still can not merge them together to make a 3D object. Do you have > any suggestion? The example in the delaunay3 shows how to create a 3D mesh for a cube; this could be scaled and translated to be on the bottom of your surf() surface. Alternately, >> x = [ 0 1; 1 1; 1 1; 1 1; 1 0; 0 0;0 0;0 0]; y = [0 0; 0 0; 0 1; 1 1; 1 1; 1 1; 1 0; 0 0]; z = [0 0; 0 1; 1 1; 1 0; 0 0; 0 1; 1 1; 1 0]; >> patch(x,y,z,ones(size(z))) creates a patch for a 3 of the 6 faces of a cube; you could continue along the same vein but rotated 90 degrees (holding Z the same) to fill the other 3 faces.
From: Steven Lord on 1 Jun 2010 13:56 "Hane " <jesuismoi28(a)yahoo.com> wrote in message news:htrtap$a21$1(a)fred.mathworks.com... > Hi, > I am trying to generate a 3D object to use in a CAD tool. The object is a > cube with a random surface on top of that as one of its faces. I already > generated the random surface usig surf command. I should only close the > surface like a cube (vertically and horizontally) and make it 3D but I do > not know HOW? > > I wonder if anybody has any helpful idea? In what representation do you want the 3D object to be stored? Do you want a 3-D array with 0's and 1's where elements containing 1 are inside the object and elements containing 0 are outside? Do you want a triangulation of the surface of the object a la DELAUNAY? Do you want a tesselation of the interior of the object a la DELAUNAY3? Do you want a collection of patch objects representing the various faces of the 3D object? If you want a different representation, describe specifically what you want and someone may have a suggestion for how to achieve that representation. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
From: Hane on 3 Jun 2010 11:05
"Steven Lord" <slord(a)mathworks.com> wrote in message <hu3hk8$i18$1(a)fred.mathworks.com>... > > "Hane " <jesuismoi28(a)yahoo.com> wrote in message > news:htrtap$a21$1(a)fred.mathworks.com... > > Hi, > > I am trying to generate a 3D object to use in a CAD tool. The object is a > > cube with a random surface on top of that as one of its faces. I already > > generated the random surface usig surf command. I should only close the > > surface like a cube (vertically and horizontally) and make it 3D but I do > > not know HOW? > > > > I wonder if anybody has any helpful idea? > > In what representation do you want the 3D object to be stored? > > Do you want a 3-D array with 0's and 1's where elements containing 1 are > inside the object and elements containing 0 are outside? > > Do you want a triangulation of the surface of the object a la DELAUNAY? > > Do you want a tesselation of the interior of the object a la DELAUNAY3? > > Do you want a collection of patch objects representing the various faces of > the 3D object? > > If you want a different representation, describe specifically what you want > and someone may have a suggestion for how to achieve that representation. > > -- > Steve Lord > slord(a)mathworks.com > comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ > To contact Technical Support use the Contact Us link on > http://www.mathworks.com > I want it to be in stl format, I actually found a code to convert the surf to stl. I generated 6 surfaces (faces) and I simply conbine their stl codes together. It can make my 3D object. I do not know if this is the right approach? |