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fix transform by instance, also make it take potentially different additional trafos into account

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Michael Kirsch 2019-07-18 22:19:25 +02:00 committed by Joseph Lenox
parent 794b3a1419
commit 852fb80555
1 changed files with 23 additions and 5 deletions
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28
xs/src/libslic3r/Model.cpp
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@ -860,13 +860,31 @@ ModelObject::transform_by_instance(ModelInstance instance, bool dont_translate)
{
// We get instance by copy because we would alter it in the loop below,
// causing inconsistent values in subsequent instances.
TransformationMatrix trafo = instance.get_trafo_matrix(dont_translate);
TransformationMatrix temp_trafo = instance.get_trafo_matrix(dont_translate);
this->apply_transformation(temp_trafo);
temp_trafo = temp_trafo.inverse();
/*
Let:
* I1 be the trafo of the given instance,
* V the originial volume trafo and
* I2 the trafo of the instance to be updated
Then:
previous: T = I2 * V
I1 has been applied to V:
Vnew = I1 * V
I1^-1 * I1 = eye
T = I2 * I1^-1 * I1 * V
---------- ------
I2new Vnew
*/
for (ModelInstance* i : this->instances) {
i->rotation -= instance.rotation;
i->scaling_factor /= instance.scaling_factor;
if (!dont_translate)
i->offset.translate(-instance.offset.x, -instance.offset.y);
i->set_complete_trafo(i->get_trafo_matrix().multiplyRight(temp_trafo));
}
this->origin_translation = Pointf3(0,0,0);
this->invalidate_bounding_box();