how can i rotate a plane?

i want to rotate a triangular laminate counter clockwise about the normal of another triangular laminate passing through one of its vertex?

Answer 1

[Matt J]

This should help,

https://www.mathworks.com/matlabcentral/fileexchange/30864-3d-rotation-about-shifted-axis

It will give you the homogeneous coordinate transformation matrix, M, of the rotation. So, if the equation for the plane to be rotated in homogeneous coordinates is,

[a,b,c,d]*[x;y;z;1]=0

then the rotated equation vector for the plane will be

M\[a;b;c;d]