How to rotate an Alpha Shape, or points that defines the edge of a 3D shape?

2016 1 21
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更新时间：2016 1 21
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Hello,
I am trying to rotate a 3-D surface which composed of 1000 points defined in space. I turned these points to a surface by using alphashape function.
I tried to rotate with "rotate" function but, I got type error;
Error in rotate (line 59)
t = get(h(i),'type');
Can you suggest me a solution?
For additional information, please ask it.
Thanks in advance, Mücahit

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Mike Garrity
Mike Garrity 2016-1-21

1 个投票

Could you post your code?
Here's a modified version of one of the examples:
[x1, y1, z1] = sphere(24);
x1 = x1(:);
y1 = y1(:);
z1 = z1(:);
x2 = x1+5;
P = [x1 y1 z1; x2 y1 z1];
P = unique(P,'rows');
shp = alphaShape(P,1)
h = plot(shp);
axis vis3d
for i=1:12
rotate(h,[1 1 1],30)
pause(.25)
end

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Mücahit Gürbüz
Mücahit Gürbüz 2016-1-21
Thank you Mike,
My code as follows;
clc
clear all
[P]=Rock1(15);
as_rock = alphaShape(P(:,1),P(:,2),P(:,3),4);
plot(as_rock,'FaceColor',[218 136 86]./255,'EdgeAlpha',0) %plot the rock
title('Simulated Figure') %create a title
lighting gouraud %lighting
light('Position',[100 -200 50],'Style','local') %light position
axis equal % realistic axes
direction = [1 0 0];
origin = [P(1,1) P(1,2) P(1,3)];
rotate(as_rock,direction,25,origin);
And the Rock1 function as follows;
function [ P ] = Rock1( D ) %input arguments Diameter and returns a defined Rock points with diameter D
x=randn(1000,1); %assign normally distributed random numbers
multi_x1=D/(max(x)-min(x)); %to make its diameter, find its current diameter with max-min function and find its multiplyer
x11= (multi_x1*x); %final x coordinates assigned here
y=randn(1000,1);
multi_y1=D/(max(y)-min(y));
y11=(multi_y1*y);
z=randn(1000,1);
multi_z1=D/(max(z)-min(z));
z11=multi_z1*z;
P = [x11 y11 z11]; %output argument like points on space that defines our rocks
end
Thank you!
Mike Garrity
Mike Garrity 2016-1-21
Ah, the rotate function wants the handle of the graphics object, not the alphaShape. The graphics object is created by the plot function. So you need something like:
h = plot(as_rock,'FaceColor', ...
...
rotate(h,direction,25,origin)

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