why point correspondence to rotation matrix calculation is not my expected?
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for example, at first ,one point P1(1,0,0) rotate pi/2 angle by y-axis,then get the point P2(0,0,-1), then rotate pi/2 angle by x-axis, then get the point P3(0,1,0). i use eul2rotm function to specify eular angle to get rotation matrix,then get the destination point by premultipy format,but get the result is not my expected P3?
P1 = [1,0,0];
eular = [0,pi/2,pi/2]
r = eul2rotm(eular,'ZYX'); % premultipy format
destinationPt = r*P1' % not same as P3 ?
if i take eular decompose into two component, ie rotate pi/2 angle correspondance to y-axis,x-axis, then i can get my expected result P3.
eularY = [0,pi/2,0];
eularX = [0,0,pi/2];
ry = eul2rotm(eularY);
rx = eul2rotm(eularX);
destiPt = rx*ry*P1' % is same as P3, which is my expect result.
i don't understand why eular angles vector three components not write together?