i want to export 3d stl format image into matlab and want to see in matlab

Demonstrably, it shows a white part illuminated by two strategically placed lights of different color so as to reveal the surface contours over a broad range of viewing angles. I think most people would call that "colorful".

If you're doing something else, then you're doing something else. If you want something else specific, then you'll have to say what you want. If you're trying to do the same thing as the example, but getting errors, what are the errors? The function I used for the lighting setup is attached above.

If you don't want to use lighting to reveal the surface, then how do you want to show it? Any solid color will tend to have terrible contrast.

% needed to zip attachments for the forum

unzip things.zip

% read the file

fname = 'things/heaterductmount.stl';

T = stlread(fname);

% if you don't want white, then pick a color

trisurf(T, ...

'facecolor','m', ...

'edgecolor','none');

% you'll still have to do figure setup somehow

material('shiny') % without lighting, this won't matter

axis('image')

view(3)

grid('on')

You could try to highlight edges, but most realistic models will end up having so many edges that it will just look like a complete mess. Is it even important to show the edges?

figure

% or maybe you want to draw all the edges?

trisurf(T, ...

'facecolor','m', ...

'edgecolor','k');

% you'll still have to do figure setup somehow

material('shiny') % still won't matter

axis('image')

view(3)

grid('on')

In order to reveal the surface contours, you'll need some sort of lighting. While this might look great from one angle, rotating the camera will reveal that the bottom of the part is completely unviewable because it's in shadow. Lights are stationary in the xyz space. Using camlight() only creates the light with an initial position relative to the current camera position. It's possible to make the light track the camera position as it moves, but it would take considerable setup.

figure

% if you don't want white, then pick a color

trisurf(T, ...

'facecolor','m', ...

'edgecolor','none');

% you'll still have to do figure setup somehow

camlight % add lighting this time

material('shiny')

axis('image')

view(3)

grid('on')

If the goal is to color the faces differently, then you'll have to come up with a way to describe how the faces should be colored.

DGM 2024-1-7

在 MATLAB Online 中打开

FWIW, here's an example based on the linked thread:

% needed to zip attachments for the forum

unzip things.zip

% read the file

fname = 'things/heaterductmount.stl';

T = stlread(fname);

% if you don't want white, then pick a color

h = trisurf(T, ...

'facecolor','m', ...

'edgecolor','none');

% set up the axes with one offset light that follows the camera

followerlight(h);

% this does all the figure setup

function followerlight(hobj)

set(hobj,'HitTest','off'); % same as in Matt's example

hax = ancestor(hobj,'axes'); % get the parent axes

set(hax,'NextPlot','add'); % same as in Matt's example

set(hax,'buttondownfcn', @buttondownfcn); % same as in Matt's example

material(hax,'shiny') % or whatever reflectance you prefer

axis(hax,'image')

view(hax,3)

grid(hax,'on')

c = camlight('headlight'); % add light

set(c,'style','infinite'); % set style of light

function buttondownfcn(ax,~)

fig = ancestor(ax,'figure'); % get figure handle

[oaz, oel] = view(ax); % get current azimuth and elevation

oloc = get(0,'PointerLocation'); % get starting point

set(fig,'windowbuttonmotionfcn',{@rotationcallback,ax,oloc,oaz,oel});

set(fig,'windowbuttonupfcn',{@donecallback});

end

function rotationcallback(~,~,ax,oloc,oaz,oel)

locend = get(0, 'PointerLocation'); % get mouse location

dx = locend(1) - oloc(1); % calculate difference x

dy = locend(2) - oloc(2); % calculate difference y

factor = 2; % correction mouse -> rotation

newaz = oaz-dx/factor; % calculate new azimuth

newel = oel-dy/factor; % calculate new elevation

view(ax,newaz,newel); % adjust view

c = camlight(c,'headlight'); % adjust light

end

function donecallback(src,~)

fig = ancestor(src,'figure'); % get figure handle

set(fig,'windowbuttonmotionfcn',[]); % unassign windowbuttonmotionfcn

set(fig,'windowbuttonupfcn',[]); % unassign windowbuttonupfcn

end

Obviously, I can't demonstrate the behavior in the browser.

DGM 2024-1-8

I am not intimately familiar with all the various file formats, the degree to which the features of each one are supported within MATLAB, and I have no idea what your requirements are. From what I can tell, it's not clear why the format should have any bearing on whether the file can be encrypted. It's also not clear to me what sort of color information is expected, or whether it's necessary.

Reet 2024-1-8

okk, thank you so much sir for your help.

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