# I have some rendering problem , i think i can't solve this by myself

**URL:** <https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405>\
**Category:** Development\
**Created:** [November 23, 2022, 12:00pm UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405 "2022-11-23T12:00:44Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![jay1987](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jay1987/32/16183_2.png) [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Post date:** [November 23, 2022, 12:00pm UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/1 "2022-11-23T12:00:44Z")

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the volumerendering of CT data in slicer is awesome ,the preset of CT-AAA looks below in both CPU Raycast and GPU Raycast  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/9/d9c71e3c0d0cbcf6c9a0cfe06b79dd1f33ee78dc.jpeg)

but when I copy the preset parameters to MITK , the CPU Ray cast like Slicer Effect,it’s good.and slow,  
but the GPU Version looks like below  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/2/5284a523e36548aea9a0144fc811e6b99c413e5c.jpeg)

Slicer and MITK both use vtkGPUVolumeRayCastMapper as Render , But i don’t know that’s wrong in MITK .

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [November 23, 2022, 12:11pm UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/2 "2022-11-23T12:11:24Z")

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> [@jay1987](#):
>
> i don’t know that’s wrong in MITK

To me this sounds like an issue for MITK, not Slicer.

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**Author:** ![jay1987](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jay1987/32/16183_2.png) [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Post date:** [November 23, 2022, 1:24pm UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/3 "2022-11-23T13:24:06Z")

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that’s right Pinter  
sorry for me to find help from slicer community.  
the mitk community is not active  
i think maybe someone here can find the difference between the vtkGPUVolumeRayCastMapper

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [November 23, 2022, 6:05pm UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/4 "2022-11-23T18:05:45Z")

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The rendering pipeline is more than just the question of which mapper is used, since there are many settings that influence the result. You could print the mapper and renderer / render window settings in both programs to see what’s set differently.

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**Author:** ![jay1987](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jay1987/32/16183_2.png) [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Post date:** [November 24, 2022, 12:51am UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/5 "2022-11-24T00:51:12Z")

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thank you pieper  
it’s a good idea.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [December 1, 2022, 6:17am UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/6 "2022-12-01T06:17:04Z")

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I’m just curious, why would you consider using MITK instead of Slicer?

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**Author:** ![jay1987](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jay1987/32/16183_2.png) [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Post date:** [December 2, 2022, 3:12am UTC](https://discourse.slicer.org/t/i-have-some-rendering-problem-i-think-i-cant-solve-this-by-myself/26405/7 "2022-12-02T03:12:51Z")

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i don’t think MITK can instead of Slicer.  
I always think Slicer is the development trend in the future  
my company has an old project using MITK , and the project has been in use in some hospital .my leader do not understand programming,and wants me to Optimize this program  
finaly i find the reason why MITK rendering so strange,MITK use vtkLightKit instead of UseJittering , i change the rendering parameter from Slicer to MITK,it works