Comments and Ratings

Cool, see how it works!

I found a copy of the NURBS toolbox (for 2006b) here:

http://webscripts.softpedia.com/script/Scientific-Engineering-Ruby/Mathematics/nurbs-33691.html

Does anyone know if there's a newer version of this?

Cannot find the original NURBS Toolbox

preventing waitbar from slowing down your calculation:
for i =1:50000
        if ((i/100) == floor(i/100))
            waitbar(i/all.data.num_of_mol);
        end
end

I've had the same problems with the weights and fixed it in this way:
In bspeval.m between line 45 and 46, I've inserted:
for i=0:d
   N(i+1) = N(i+1)*c(4,tmp1+i);
end
N = N / sum(N);

This code applies the weights, but there is still a problem with nrbplot.m, but this is fixed by changing line 101 from
p = nrbeval(nurbs,linspace(0.0,1.0,subd));
to
[p, ggg] = nrbeval(nurbs,linspace(0.0,1.0,subd));

Where ggg is some variable, which isnt used afterwards.

Besides these small errors, this code is great. Maybe there are more error, but this works for me for now.

Nice programming exercise for duplicating the built-in CHAR function. Please remove.

It is really an excellent code. However, when I try to create a large geometry, it is still time consuming. The function 'swap' excutes too many string copy in the 'while' loop and it cost much time when there are a mount of data points. I rewrote the function as follow and the it only needs 1/3 time.

function s = wrap(str,delim,n)
    tmp = blanks(n);
    strlength = length(str);
    i = 1;
    index=1;
    while (strlength-index+1>n)
        tmp = str(index:index+n-1);
        d = strfind(tmp,delim);
        d = d(end);
        index = index + d;
        s(i,:) = [tmp(1:d) blanks(n-d)];
        i = i+1;
    end
    if (strlength-index+1>0)
        s(i,:) = [str(index:strlength) blanks(n-(strlength-index+1))];
    end

colour match XP scheme. It would be nice to have an Ubuntu theme too.

Since it's not immediately obvious. It should be mentioned that I updated GNURBS in response to Dr. Davis' comments.

Does not work with newer matlab versions...

Hi, could you please specify what the 2D arrays for X,Y,Z actually are?

cool, I'm looking for this

Very good!

But there is a mistake in nrbcoons:
If you add

hold on
nrbplot(crv1,48);
nrbplot(crv2,48);
nrbplot(crv3,48);
nrbplot(crv4,48);

before the nrbcoons command in democoons, you will see that the coons surface does not match the curves.
Fix it with replacing line 82 in nrbcoons with:

t = nrb4surf(u1.coefs(:,1), u2.coefs(:,1), u1.coefs(:,end), u2.coefs(:,end));

It is excellent for a curve that is really smoothly curved.

Do you have any idea how to handle the case that the curve is reduced to a straight line and/or the curved is reduced to a polygon as in the case of a nurb curve of order 2 in the Nurbs toolbox?

Thanks!

There are some very unstable numerics in this code that need to be fixed. For example, you compute R = inv(M) and then only use R to multiply with T=R*up. Never multiply by the inverse. Use T=M\up instead. In addition, there is a very odd use of "det" to solve a system. det is extremely numerically sensistive and should never be used to solve a system.

COOL

good

Works brilliantly! Thanks a lot!
CUBIT (http://cubit.sandia.gov/) is also capable to import the *.igs file created by igesout(.).

Just one remark:
At line 136,
"G.date = datestr(today); ",
I had to change 'today' -> 'date', since MATLAB apparently doesn't recognize 'today'.

Really fast.
I used it to get a surface model from a coordinate measuring machine.
Now if only I could get it into Solidworks properly!

I was thinking of doing just what you have done only last friday.. Excellent to find that it already has been done. thanks

simple and effective!

Nice utitity. Help is adequate (maybe a "see also" to GLINE could be added).

Possible improvements:
- Setting the doublebuffer property to 'on' will remove some flicker.
- Allowing the user to escape from the function.
- Making the figure modal during this drawing

Very nice, a real CAD function!