How to plot a surface in 3D space from 4 points

Hello, I would like to plot a flat, vertical, surface in Matlab that is passing through the points A=(3.5,0,0), B=(0,8.59,0), C=(3.5,0,100), D=(0,8.59,100). Could you please help me with this? Thank you, K.

[José-Luis]

 doc patch()

Answer 1

[KSSV]

A=[3.5,0,0] ;
B=[0,8.59,0] ;
C =[3.5,0,100] ;
D = [0,8.59,100] ;

coor = [A ; B; D; C ] ;

 fill3(coor(:,1),coor(:,2),coor(:,3),'r', 'FaceAlpha', 0.5)

[Katerina F]

Hello, Thanks, it works. I would just like to ask something additional. Is there a way to make this surface transparent? I tried the 'FaceAlpha','0.5', but it does not work.

Thanks

[KSSV]

doc alpha...

[Jan]

This works fine under R2016b:

fill3(coor(:,1),coor(:,2),coor(:,3),'r', 'FaceAlpha', 0.5)

Please explain, what "does not work" mean.

[Katerina F]

Thanks. It works. Probably I was applying it in a wrong way and it was showing me an error.

Answer 2

[John BG]

Hi Katerina

this is John BG <mailto:[e-mail] [e-mail]>

while

A=[3.5,0,0]
B=[0,8.59,0]
C=[3.5,0,100]
D=[0,8.59,100]

P=[A;B;C;D]

X=P(:,1);Y=P(:,2);Z=P(:,3);
h1=patch('XData',X,'YData',Y,'ZData',Z,'EdgeColor','green','FaceColor',[.2 .8 .2],'LineWidth',2)

.

delivers a bow tie .

.

if you swap points order, B with A .

P=[B;A;C;D]

.

.

then one gets the sought flat vertical surface.

if you find this answer useful would you please be so kind to consider marking my answer as Accepted Answer?

To any other reader, if you find this answer useful please consider clicking on the thumbs-up vote link

thanks in advance

John BG

<mailto:[e-mail] [e-mail]>

[Adam]

Comment from Katerina F, originally in a flag:

'this answer shows the width of lines too'

Please add comments in the comments box, not as a flag. Flags are for reporting spam or other problems for forum editors or Mathworks staff to look at and resolve.

[John BG]

so what was the comment?

[Adam]

It is in bold in my comment.