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# Translate rotate and scale STL surfaces

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Nataliya Perevoshchikova on 30 Jan 2019
Edited: Brice Kabore on 11 May 2020
I imported three STL files (3d) as patch data. I merged nodes. These objects can be plotted with faces and vertices. My next step is to rotate, translate and scale one surface to two surfaces based on vertices. Vizually, I know where should be insertion points of fitted surface to two surfaces.
What would be steps to perform these operations?
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Brice Kabore on 11 May 2020
For translation
[V, F]=stlread("isopoison.stl"); %although the new stlread version gives a different structure
P=(8,0,0)% translate in x by 8
V = V+ P
For scaling
scale=2.0
V=V*scale% or V(:,1)=V(:,1)*scale
For rotatation you can use this function basically creating a rotation matrix that will be multiplied by V which contain your vertices indice is the axis, 1 for x axis 2 for y ...
function vertex = rotation(V, indice, angle)
% [V, F]=stlread("isopoison.stl");
% angle=-pi/2;
Rz = [ cos(angle), -sin(angle), 0 ;
sin(angle), cos(angle), 0 ;
0, 0, 1 ];
Ry = [ cos(angle), 0, sin(angle) ;
0, 1, 0 ;
-sin(angle), 0, cos(angle) ];
Rx = [ 1, 0, 0 ;
0, cos(angle), -sin(angle);
0, sin(angle), cos(angle) ];
if(indice==1)
vertex = V*Rx;
end
if(indice==2)
vertex = V*Ry;
end
if(indice==3)
vertex = V*Rz;
end
end

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### Answers (1)

KSSV on 30 Jan 2019
You need to know about geometric transformations...read here https://pages.mtu.edu/~shene/COURSES/cs3621/NOTES/geometry/geo-tran.html
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KSSV on 30 Jan 2019
It should be possible...

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