From: Rachit on
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
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
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
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
> 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.
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