There is colormap inconsistency in my graph for the code attatched.

Hi,

I used a package arrow3D. Here, I want the colormap on arrow to change with the variation in z-axis.

IANd since deltaV(3) is the z-direction. I tried passing it as

arrow3D(pos,deltaV,deltaV(3))

but it's not helping.

Thanks

[KM]

Hi, @Torsten

Could you please look into this?

Answer 1

[alexander Mcghee]

normalize the z-direction values between 0 and 1 so that they can be properly used to index the colormap.

pos = postot(ii,:)-.5*deltaV;

% Normalize the z-direction value between 0 and 1
z_norm = (deltaV(3) - min(deltaV0(3))) / (max(deltaV0(3)) - min(deltaV0(3)));

% Get the color from the colormap based on the normalized z-direction value
colorCode = colormap(jet(64));
arrowColor = colorCode(round(z_norm * 63) + 1, :);

arrow3D(pos, deltaV, arrowColor)        

[KM]

@alexander Mcghee Thank you so much fo the response. I did try that as,

 Normalize the z-direction value between 0 and 1
            min_z = min(deltaV0(3));
            max_z = max(deltaV0(3));
            if deltaV(3) <= min_z
                z_norm = 0;
            elseif deltaV(3) >= max_z
                z_norm = 1;
            else
                z_norm = (deltaV(3) - min_z) / (max_z - min_z);
            end
 
% Get the color from the colormap based on the normalized z-direction value
colorCode = colormap(jet(64));
arrowColor = colorCode(round(z_norm * 63) + 1, :);

But the colour code is not working properly and sometimes giving an script index error. Could you please cross check.