[kreativasas]

hi guys,
 i need an help.
i use modelscalar and it works.
but if i rotate the object (and rotate the modelscalar with the obj) i need to transform not only 1 axe but 2 or 3 (it depends by the rotation) to don't morph the object.

How i can do?

[abenedik]

The order of transformations is important. If you first rotate the model and then scale it, then the rotated model will be scaled and this can stretch the model in a way that is not intended.

To apply multiple transformations first check that the center of the 3D model is at coordinates (0, 0, 0) - around this point the model will be rotated and from that point the scaling will be applied. This is also called a pivot point. If the pivot point is somewhere else, then you can first apply a translation to move the center to that point.

Then add scale transformations, after that add rotation and finally add a translation.

You can also use StandardTransfrom3D that comes with Ab3d.PowerToys and is not a transformation from WPF 3D objects model. This requires a different usage pattern - see the "Utilities / StadardTransform3D sample" for more information.

[kreativasas]

ok but i need to apply many transformation:
first i need to move, then rotate and at last scale....
so when the obj is scaled it stretches.... is there a way to scale the obj after rotation without stretching it?

[abenedik]

Why do you think that you "first i need to move, then rotate and at last scale"?

Of you want to have stretched and rotated object, then you will need to first scale it and then rotate it - this is the order that needs to be in the Transform3DGroup - for example:

Code:

var transform3DGroup = new Transform3DGroup();
transform3DGroup.Children.Add(new ScaleTransform3D(2, 1, 1)); // scale x for 2x
transform3DGroup.Children.Add(new RotateTransform3D(new AxisAngleRotation3D(new Vector3D(0,1,0), 45))); // rotate by 45 degrees around Y axis