# Change shader model to SM4 crash

**URL:** <https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240>\
**Category:** Platform & Builds\
**Tags:** unreal-engine, crash, bug-report, editor, feedback, question\
**Created:** [June 18, 2015, 11:13am UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240 "2015-06-18T11:13:03Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Hevedy](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hevedy](https://forums.unrealengine.com/u/Hevedy)\
**Post date:** [June 18, 2015, 11:13am UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/1 "2015-06-18T11:13:03Z")

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In the 4.8.0 release after change the shader model from the settings in the engine in the top of the viewport to SM4 then stop and crash with a report of null shader, using the 4.8.0 build from launcher.

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**Author:** ![Lovecraft\_K](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Lovecraft\_K](https://forums.unrealengine.com/u/Lovecraft_K)\
**Post date:** [June 18, 2015, 1:37pm UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/2 "2015-06-18T13:37:28Z")

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Hi -

I have not been able to reproduce this crash. Can you include your Machine ID from the submitted Crash Report here? Also are you doing this in a specific project, and can it be reproduce in a blank project without starter content or first person template?

Thank You

Eric Ketchum

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**Author:** ![Hevedy](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hevedy](https://forums.unrealengine.com/u/Hevedy)\
**Post date:** [June 18, 2015, 5:55pm UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/3 "2015-06-18T17:55:39Z")

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MachineId:9FAB51024F9246128A60D7B38BE92E35  
EpicAccountId:5fec2ede509045da98157a67ef1ecead

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**Author:** ![Lovecraft\_K](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Lovecraft\_K](https://forums.unrealengine.com/u/Lovecraft_K)\
**Post date:** [June 18, 2015, 6:27pm UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/4 "2015-06-18T18:27:37Z")

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Hi Hevedy -

Thank you for the additional information. It looks like you have a Light Propagation Volume in use in your level. LPV is not compatible with Shader Model 4 and does require Shader Model 5. That being said, I have entered a report of the crash, to see if we can get a warning placed in the engine about switching Shader Models with LPVs active, for reference UE-17333.

Eric Ketchum

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**Author:** ![Hevedy](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Hevedy](https://forums.unrealengine.com/u/Hevedy)\
**Post date:** [June 18, 2015, 6:34pm UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/5 "2015-06-18T18:34:44Z")

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Thanks you, yeah probably i got that enabled in the engine folder but is for other project, i don’t need that in this, is possible to disable for this the lpv and for the other have enabled ? or i need to disable for all ?  
Will be nice to have a setting to enable or disable that for the projects like other things.

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**Author:** ![Lovecraft\_K](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Lovecraft\_K](https://forums.unrealengine.com/u/Lovecraft_K)\
**Post date:** [June 18, 2015, 6:38pm UTC](https://forums.unrealengine.com/t/change-shader-model-to-sm4-crash/322240/6 "2015-06-18T18:38:46Z")

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Hey -

No it has not officially been enabled and does have to be set for the engine entirely.

Thank You

Eric Ketchum