# Creating and exporting surface from points **URL:** \ **Category:** Graphics and plotting\ **Created:** [July 12, 2023, 10:43am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115 "2023-07-12T10:43:21Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 12, 2023, 10:43am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/1 "2023-07-12T10:43:21Z")
Hello I have created a scilab file where I put in different layer points coordinate. now I’d like to create a surface from all this layer and then export it. How can I do? thnaks sergio ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 12, 2023, 11:30am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/2 "2023-07-12T11:30:48Z")
Hello Sergio, Is the distribution of points structured in some way, or completely unstructured ? S. ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 12, 2023, 12:17pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/3 "2023-07-12T12:17:26Z")
I’ve created a matrix of points Each row have coordinates x,y,z of the points each row same points number it’s enough for you? ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 12, 2023, 12:25pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/4 "2023-07-12T12:25:31Z")
> [@Look4nurns](#): > > Each row have coordinates x,y,z of the points > each row same points number Can you be more precise ? Is the matrix of size n by 3 ? What do you mean by “each row same points number” ? Can you share your file here ? S. ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 12, 2023, 3:18pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/5 "2023-07-12T15:18:23Z")
Hi I can send you in a private way or put here only a part of it (where the matrix is created) [esempio.sod](https://scilab.discourse.group/uploads/short-url/gwccfCqnu2gcCkEJEA0Fj6eMXrz.sod) (9.8 KB) ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 12, 2023, 3:23pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/6 "2023-07-12T15:23:27Z")
Edit your previous post : you can save the matrix in a sod file, i.e. `save data.sod A` and drag and drop the file in the editing window. S. ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 12, 2023, 4:40pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/7 "2023-07-12T16:40:26Z")
I meant only the resulting matrix. You sent the whole Scilab script (which doesn’t run because some matrices are not defined). So, please save the matrix you were talking about in a .sod file. S. ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 6:58am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/8 "2023-07-13T06:58:48Z")
Hi Ok is easier if I give you the all file because I don’t have only the matrix. You need also the txt file in the same folder [test\_surf.sod](https://scilab.discourse.group/uploads/short-url/fJaUq5lRWdZRnnzaTdnZcUgpDV8.sod) (21.1 KB) [Import\_Mat\_Rad\_Chord\_Gam\_Camb\_thick\_P.sod](https://scilab.discourse.group/uploads/short-url/cDn7ONlgf8t84dRXdsyLdOzaAhB.sod) (650 Bytes) ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 13, 2023, 7:10am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/9 "2023-07-13T07:10:04Z")
Hello, What do you want to do exactly ? Your script already draws a (very folded) surface. Would a STL format export be OK for you ? What is the `RA_X2P_Imp2_TraslRot1.ibl` file ? ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 7:29am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/10 "2023-07-13T07:29:16Z")
Hello I’d like to have a iges or step surface. STL is bad for me bacause I have to use the file in a cad, The .ibl file is a file that I inport in the CAD and create a array of points that I had to use for creating a surface tanks ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 13, 2023, 7:51am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/11 "2023-07-13T07:51:58Z")
Sorry, Scilab has no IGES or STEP converter. Maybe NURBS conversion can be done by other software. However, STL conversion of a Scilab Fac3d object is quite easy to do, if you can convert STL to another format afterwards it may be the way to go for your problem. S. ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 8:32am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/12 "2023-07-13T08:32:03Z")
Thanks OK maybe I can try with STL and check for a conversion S ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 13, 2023, 10:15am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/13 "2023-07-13T10:15:18Z")
Here is a script to do the conversion to STL: ```auto // find object h = findobj("type","Fac3d"); X = [h.data.x;mean(h.data.x,1)] Y = [h.data.y;mean(h.data.y,1)]; Z = [h.data.z;mean(h.data.z,1)]; // add center vertex and form triangles X=[X([5 1 2],:) X([5 2 3],:) X([5 3 4],:) X([5 4 1],:)]; Y=[Y([5 1 2],:) Y([5 2 3],:) Y([5 3 4],:) Y([5 4 1],:)]; Z=[Z([5 1 2],:) Z([5 2 3],:) Z([5 3 4],:) Z([5 4 1],:)]; // sides vectors U=[X(2,:)-X(1,:); Y(2,:)-Y(1,:); Z(2,:)-Z(1,:)]; V=[X(3,:)-X(1,:); Y(3,:)-Y(1,:); Z(3,:)-Z(1,:)]; // normals computation NX=U(2,:).*V(3,:)-U(3,:).*V(2,:); NY=U(3,:).*V(1,:)-U(1,:).*V(3,:); NZ=U(1,:).*V(2,:)-U(2,:).*V(1,:); // write STL file n = size(X,2); fd = mopen('object.stl','wt'); mfprintf(fd,"solid object\n"); for i = 1:n mfprintf(fd,"facet normal %f %f %f\n",NX(i),NY(i),NZ(i)); mfprintf(fd," outer loop\n"); mfprintf(fd," vertex %f %f %f\n",X(1,i),Y(1,i),Z(1,i)); mfprintf(fd," vertex %f %f %f\n",X(2,i),Y(2,i),Z(2,i)); mfprintf(fd," vertex %f %f %f\n",X(3,i),Y(3,i),Z(3,i)); mfprintf(fd," endloop\n"); mfprintf(fd,"endfacet\n"); end mfprintf(fd,"endsolid object"); mclose(fd); ``` resulting geometry looks good in online STL viewers: ![Capture d’écran 2023-07-13 à 12.07.47](https://global.discourse-cdn.com/free1/uploads/utc/original/1X/ce9f2f6673456e9df7ffcaad1560b01d4fa56024.png) ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 10:24am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/14 "2023-07-13T10:24:10Z")
thanks I’ll check it ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 10:32am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/15 "2023-07-13T10:32:59Z")
Sorry the code is a generic one? It isn’t the same you put in my scilab file in order to obtain this stl file. I’ve tryed but it doesn’t work ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 13, 2023, 1:21pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/16 "2023-07-13T13:21:34Z")
Ok now it works I need something smother! do you thinck that scilab could connect to open library for nurbs generator? s ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 13, 2023, 5:24pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/17 "2023-07-13T17:24:51Z")
You can arbitrarily (by changing the two `100` occurences below) refine the original surface given by your 3 matrices `x3,y3,z3` by spline interpolation with `splin2d` and `interp2d` with the following code. Insert it before STL export. ```auto [N,M]=size(x3); cx=splin2d(1:N,1:M,x3); cy=splin2d(1:N,1:M,y3); cz=splin2d(1:N,1:M,z3); [I,J]=ndgrid(linspace(1,N,100),linspace(1,M,100)); X3=interp2d(I,J,1:N,1:M,cx); Y3=interp2d(I,J,1:N,1:M,cy); Z3=interp2d(I,J,1:N,1:M,cz); mesh(X3,Y3,Z3) ``` ![Capture d’écran 2023-07-13 à 19.23.58](https://global.discourse-cdn.com/free1/uploads/utc/original/1X/c3f507deaf39ab4edd90ade3419d32e503fd2979.png) ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 14, 2023, 6:47am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/18 "2023-07-14T06:47:40Z")
Thank you very much! Another thing i have another version of the code where I create a series of surfaces with different sweep (see add) [sfalsatura.sod](https://scilab.discourse.group/uploads/short-url/sjv9jUTjbhXXgA6V7GPICdBwKJL.sod) (1.5 KB) I have tryed do add the STL part at the end (after “// Scrittura file IBL con tutte le catene // Superficie Unica Pala”) but I have only the last geometry. thanks s ---
**Author:** ![mottelet](https://yyz2.discourse-cdn.com/free1/user_avatar/scilab.discourse.group/mottelet/32/13_2.png) [@mottelet](https://scilab.discourse.group/u/mottelet)\ **Post date:** [July 14, 2023, 8:13am UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/19 "2023-07-14T08:13:30Z")
I think you can adapt the code yourself: insert the exporting code in your loop and clear the figure between each surface plot, and also change the STL file name. S. ---
**Author:** ![Look4nurns](https://avatars.discourse-cdn.com/v4/letter/l/b487fb/32.png) [@Look4nurns](https://scilab.discourse.group/u/Look4nurns)\ **Post date:** [July 20, 2023, 2:48pm UTC](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115/20 "2023-07-20T14:48:59Z")
Hi I’ve tryed but I’m too low in scilab programming. Can you haelp me? [Next page](https://scilab.discourse.group/t/creating-and-exporting-surface-from-points/115.md?page=2)