Wed, 02/14/2024 - 14:41
Case 1:
When I move the the component in X by 500 and Y by 500 , then the transformation (local transformation) is given by API is
X=500 Y=500 Z=0.00 (Refer image 1)
Case 2:
Now I am applying the rotation to X axis and Y axis by 50 each then the values of transformation is as follow
: X: -281.79 Y=444.789 Z=393.49 (Refer image 2)
Case 3:
Now I am applying scale of 2 to the component then values of transformation is as follow
X=263.602 Y=-151.904 Z=566.1063 (Refer image 3)
original location is : 263.602 , 151.904, 566
Questions:
1] How can the actual rotation values for each axis be calculated from the transformation?
2] Why do the X, Y, and Z values change when rotation and scaling are applied to the shape?
Thanks in advance for your help.
Extras:
I tried to calculate angle using
[cpp]
gp_Quaternion q = m_tempRecordedTransfomration[active_hashcode].GetRotation();
double aProbe, bProbe, cProbe;
q.GetEulerAngles(gp_Intrinsic_XYZ, aProbe, bProbe, cProbe);
[/cpp]
Wed, 02/14/2024 - 15:31
Hello, could you share how you update location? SetTransformationPart do not update rotation or some other separeted "Part" methods.
Best regards, Dmitrii.
Thu, 02/15/2024 - 07:05
This are result before any transformation
CurrentObject->LocalTransformation().TranslationPart() => give me x=0,y=0 z=0
for rotation around x axis :
gp_Trsf x;
gp_Trsf transformation= CurrentObject->LocalTransformation();
double angle = (45 * PI) / 180;
gp_Ax1 ax(p1, gp_Dir(1, 0, 0)); //p1 is location of component
x.SetRotation(ax, angle);
x.Multiply(transformation);
CurrentObject->SetLocalTransformation(x);
CurrentObject->LocalTransformation().TranslationPart() => give me x=0,y=441.33 z=56.41
for scaling :
gp_Trsf scaleTransform;
scaleTransform.SetScale(p1, scalefactor); //scale factor 1.5
scaleTransform.Multiply(transformation);
CurrentObject->LocalTransformation().TranslationPart() => give me x=132.33 ,y=76.84 z=2846.24
My question is why this values changes when we apply rotation or scaling ?
Thu, 02/15/2024 - 09:40
This is because matrix multiplication order is important. If you want to rotate object first and then translate it - you need multiply transformations in different order or specify different center of rotation.
Articles, that might be helpful: World-View-Projection matrix, Transformations in OCCT
Thu, 02/15/2024 - 14:36
I'm not moving the component anywhere, but still, when I apply rotation or scaling to the component by using manual value or using manipulator axis,
the translation values (X, Y, Z) of the transformations (LocalTransformation().TranslationPart()) change.
Any reason for that?