# BSpline Multiresolution error while setting Transform
**URL:** https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562
**Category:** Algorithms
**Tags:** registration, bspline
**Created:** [October 22, 2020, 8:49pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562 "2020-10-22T20:49:42Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@machadoL](https://discourse.itk.org/u/machadoL)
#### Post date: [October 22, 2020, 8:49pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/1 "2020-10-22T20:49:42Z")
Hello, everyone.
I am writing a MULTISTAGE registration pipeline.
1st Stage is a `3D rigid` one;
the output is added into `CompositTransform` object;
Then I set the `CompositTransform` as the initial transform of the Deformable BSpline stage;
Moving forward I set the multi-resolution `transformAdaptors` using the `CompositTransform` in the `transformAdaptors->SetTransform()` and it yields an ERROR: Transform mismatch.
Any clues are welcome.
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 22, 2020, 9:56pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/2 "2020-10-22T21:56:04Z")
I think the usual way is to add BSpline to Composite, like in [DeformableRegistration15](https://github.com/InsightSoftwareConsortium/ITK/blob/master/Examples/RegistrationITKv4/DeformableRegistration15.cxx) which was [recently updated](https://github.com/InsightSoftwareConsortium/ITK/commit/0aba9318fbfbd5848e69cd125e3d5c91b8840643).
---
### Author:  [@machadoL](https://discourse.itk.org/u/machadoL)
#### Post date: [October 23, 2020, 3:42pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/3 "2020-10-23T15:42:09Z")
Thanks for answering @dzenanz.
I did that. I Created a `deformableTransform`, initialized that, added to the `compositTransform`,
and set the command `compositeTransform->SetOnlyMostRecentTransformToOptimizeOn()`;
Then I set the `compositTransform` into the `deformableRegistration->SetInitialTransform()` with the extra command `registration->InPlaceOn()`;
Now, the questions that arises are the following:
Is it necessary to give the command
`compositeTransform->AddTransform(deformableRegistration->GetModifiableTransform())` in order to have the `compositTransform` fully updated?
In the `resampling` stage, what transform should I use: the `compositTransform` or the `deformableTransform`?
Thanks in advance.
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 23, 2020, 4:31pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/4 "2020-10-23T16:31:42Z")
> [@machadoL](#):
>
> Is it necessary to give the command
> `compositeTransform->AddTransform(deformableRegistration->GetModifiableTransform())` in order to have the `compositTransform` fully updated?
It probably is. But you can try omitting it and see what happens.
> [@machadoL](#):
>
> In the `resampling` stage, what transform should I use: the `compositTransform` or the `deformableTransform` ?
Probably `compositTransform`.
---
### Author:  [@machadoL](https://discourse.itk.org/u/machadoL)
#### Post date: [October 30, 2020, 8:52pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/5 "2020-10-30T20:52:52Z")
Hey @dzenanz.
I tried to use the transforms as mentioned. Now I’m getting a quite random error about the metric:
```
ExceptionObject caught !
itk::ExceptionObject (0x560232884590)
Location: "unknown"
File: /home/leo/General_sources/ITK-5.0.1/Modules/Core/Common/src/itkPoolMultiThreader.cxx
Line: 154
Description: itk::ERROR: PoolMultiThreader(0x5602328a1210): Exception occurred during SingleMethodExecute
/usr/local/include/ITK-5.0/itkImageToImageMetricv4GetValueAndDerivativeThreaderBase.hxx:260:
Exception in GetValueAndDerivativeProcessPoint:
/usr/local/include/ITK-5.0/itkBSplineBaseTransform.h:284:
itk::ERROR: BSplineTransform(0x560232885970): ComputeJacobianWithRespectToPosition not yet implemented for BSplineTransform
```
So far, I have no clue where this error starts. Although another doubt arises:
What’s the true difference between:
```
registration->SetInitialTransform();
registration->InPlaceOn();
```
and
`registration->SetMovingInitialTransform();`
What I am thinking is if it is correct to set:
`registration->setInitialTransform(CompositTransform)`
and
`registration->SetMovingInitialTransform(dtransform)`
to later on `GetModifiableTransform` give me the updated dtransform alone.
Any help is appreciated. Thanks.
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 30, 2020, 9:24pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/6 "2020-10-30T21:24:50Z")
Perhaps comments here might be of help:
>
---
### Author:  [@machadoL](https://discourse.itk.org/u/machadoL)
#### Post date: [November 10, 2020, 8:26pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/7 "2020-11-10T20:26:39Z")
Hey @dzenanz, thanks for the help. Although I did not get any further.
A better way to state my issue is:
How can I set the **BULK transform** in a BSpline registration?
I have the bulk transform (a rigid registration previously found) I only need to connect that into the pipeline.
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [November 10, 2020, 9:08pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/8 "2020-11-10T21:08:54Z")
There are 2 classes, [BSplineDeformableTransform](https://itk.org/Doxygen/html/classitk_1_1BSplineDeformableTransform.html) which has [SetBulkTransform()](https://itk.org/Doxygen/html/classitk_1_1BSplineDeformableTransform.html#af9a3a2e2808209988cd6412168216687) method and [BSplineTransform](https://itk.org/Doxygen/html/classitk_1_1BSplineTransform.html), which doesn’t. `BSplineTransform` is therefore usually part of composite transform. [DeformableRegistration15 example](https://github.com/InsightSoftwareConsortium/ITK/blob/v5.1.1/Examples/RegistrationITKv4/DeformableRegistration15.cxx) uses `BSplineTransform` + composite transform.
---
### Author:  [@machadoL](https://discourse.itk.org/u/machadoL)
#### Post date: [November 11, 2020, 6:54pm UTC](https://discourse.itk.org/t/bspline-multiresolution-error-while-setting-transform/3562/10 "2020-11-11T18:54:29Z")
I create **[another topic](https://discourse.itk.org/t/multistage-registration-using-itkregistrationmethodv4/3608)**. I guess we can make a clearer discussion.