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From: Rachit on 21 Jun 2010 14:04 HEllo All, I have a set of points through which I want to create a solid surface.I am not sure which command to use for it.Can anybody give me some suggestions ? Thanks, Rac
From: Walter Roberson on 21 Jun 2010 15:06 Rachit wrote: > I have a set of points through which I want to create a solid surface.I > am not sure which command to use for it.Can anybody give me some > suggestions ? The surface has to go _through_ the points, or _around_ the points? If it is _around_ the points, is a convex hull acceptable? If it has to go through the points, then is _any_ 3D function that goes through the points acceptable, or do you need something very restrictive such as cubic spline interpolation between neighbouring points? Can I create a roller-coaster surface connecting the points? Possibly John E'rrico's griddata() File Exchange contribution would be useful for you.
From: Rachit on 21 Jun 2010 16:29 I guess to make it more clear.I have used a plot3 function to get the points.Now I want to make a solid boundary with the outer points and then extrude it.How can I make a boundary with the given points. It is somewhat circular in geometry. Once that is created I need to make a grid and generate a mesh of the points and generate a surface.This inner surface is something which changes with time but the outer reference boundary should remain the same. Will the below function still help ?? Thanks, Rachit Walter Roberson <roberson(a)hushmail.com> wrote in message <hvodb5$8hj$1(a)canopus.cc.umanitoba.ca>... > Rachit wrote: > > > I have a set of points through which I want to create a solid surface.I > > am not sure which command to use for it.Can anybody give me some > > suggestions ? > > The surface has to go _through_ the points, or _around_ the points? If it is > _around_ the points, is a convex hull acceptable? If it has to go through the > points, then is _any_ 3D function that goes through the points acceptable, or > do you need something very restrictive such as cubic spline interpolation > between neighbouring points? Can I create a roller-coaster surface connecting > the points? > > Possibly John E'rrico's griddata() File Exchange contribution would be useful > for you.
From: Rachit on 21 Jun 2010 16:36 Walter Roberson <roberson(a)hushmail.com> wrote in message <hvodb5$8hj$1(a)canopus.cc.umanitoba.ca>... > Rachit wrote: > > > I have a set of points through which I want to create a solid surface.I > > am not sure which command to use for it.Can anybody give me some > > suggestions ? > > The surface has to go _through_ the points, or _around_ the points? If it is > _around_ the points, is a convex hull acceptable? If it has to go through the > points, then is _any_ 3D function that goes through the points acceptable, or > do you need something very restrictive such as cubic spline interpolation > between neighbouring points? Can I create a roller-coaster surface connecting > the points? > > Possibly John E'rrico's griddata() File Exchange contribution would be useful > for you. Just to make it more clear.I used the plot3 function.The shape of my image is somewhat circular. Now I want to fit a boundary from the outer coordinates and later extrude that. From the inner points I want to make a grid and mesh it. The inner co-ordinates change with time. Can I still use the same command? Thanks, Rac
From: Maurizio De Pitta' on 21 Jun 2010 16:48
> Just to make it more clear.I used the plot3 function.The shape of my image is somewhat circular. Now I want to fit a boundary from the outer coordinates and later extrude that. From the inner points I want to make a grid and mesh it. The inner co-ordinates change with time. > > Can I still use the same command? > > > Thanks, > > Rac Hi Rachel, in case John D'Errico's griddata will fail, you could consider also consider the following functions posted on FEX. Both of them might actually fit your purpose: FEX #23447 http://www.mathworks.com/matlabcentral/fileexchange/23447-how-to-plot-a-coloured-surface-from-3d-scatter FEX #5105 http://www.mathworks.com/matlabcentral/fileexchange/5105-making-surface-plots-from-scatter-data I hope it could help. Best, Maurizio. |