Issue with DRAWROTATE

AlanCattelliot · April 2022

Dear,

I just came not to understand the way drawrotate works. The first example states the problem.

When I prescribe a rotation around the Z axis (second example), the X and Y axis seem to swap.

As a result, when I add a rotation around the X axis, the model does rotate, but around the Y axis (third example).

If I add a rotation around the Y axis, the model does rotate, but around the X-axis (fourth example), in inverse trigonometric direction.

As a result, I am not so sure where to put the Center of Gravity of the floatings...

Do someone has the same issue ?

TPouzol · April 2022

Hello,

Angle rotation are applied in a certain order (X, Y then Z) !

I see you are using Blender, the axis referential in Blender is not a"scientific" one (not direct), so angle can have different signs.

Best Regards

AlanCattelliot · April 2022

Dear,

In fact, Euler's transformation are no conformal, and I was so used to make my transformation Z, Y,X order. Thanks 🙏.

Alex · April 2022

Please use the transformations applied in PARAVIEW first, since those are the same we used in our XML file

Regards

AlanCattelliot · April 2022

Thank you Alex, with your help, I manage to initiate my xml entry card with a transformation of the importated model, as a combinaison of drawmove and drawrotate :

<drawfilestl file="TF10_Assembly.stl">

<drawscale x="0.001" y="0.001" z="0.001" />

<drawmove x="-5.0" y="1.6961358168190843e-16" z="2.77" />

<drawrotate angx="180.0" angy="0" angz="0" />

That allow me to keep my center of gravity at the same place.

<floatings>

<floating mkbound="20">

<massbody value="1829" />

<center x="-0.492" y="0.0" z="1.385" />

Providing that angx and angy are related to drawmove_x,drawmove_y,drawmove_y by conventional transformations (I do not treat rotation along Z axis) :

drawrotate.set('angx',str(heel))

drawrotate.set('angy',str(trim))

drawrotate.set('angz',str(0))

drawmove.set('x',str(Gxp-xp))

drawmove.set('y',str(Gyp-yp))

drawmove.set('z',str(Gzp-zp))

with :

Gxp = "X position of the gravity center on the vtk importated model"

Gyp = "Y position of the gravity center..."

Gzp = "Z position of the gravity center..."

x1 = Gxp

y1 = Gyp*np.cos(math.radians(heel))-Gzp*np.sin(math.radians(heel))

z1 = Gyp*np.sin(math.radians(heel))+Gzp*np.cos(math.radians(heel))

xp = x1*np.cos(math.radians(trim))-z1*np.sin(math.radians(trim))

yp = y1

zp = x1*np.sin(math.radians(trim))+z1*np.cos(math.radians(trim))

xp = "X position of the gravity center on the DSP model after transformations"

yp = "Y position of the gravity center..."

zp = "Z position of the gravity center..."

AlanCattelliot · April 2022

That works well. It allows me to study hydrostatics of floating bodies with your code. And now have a big question regarding this subject !!

https://forums.dual.sphysics.org/discussion/2328/moment-computation-on-floatings-2

where I simulate a static stability experiment using DSP. Please follow the post if interested.

regards,

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Issue with DRAWROTATE

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