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Unreal Hanging On "Compiling Shaders"!!!

Everytime I do a minor change to any material it goes crazy and throws hundreds of shaders to compile. I have recently switched from unity3d I really like this environment but this is really driving me insane, ive spent hours searching but no help and I cannot finish my imported FBX file because it needs about 70+ materials and I can't do a compile on the shaders everytime I try to change it... I dunno if this is a bug or not but If not then I would recommend a button when to compile or an choice for us to choose our own shaders to compile.

Product Version: UE 4.8
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asked Aug 03 '15 at 02:00 PM in Rendering

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Hello R3Draw Studios,

Is this environment all one .fbx?

If so what is happening is you have either one material or tons of materials all being called by this one .fbx.

If so the engine will need to recalculate all of your materials because the information for your .fbx has changed.

Since the .fbx is referencing many materials and all of those are being called once they are compiled, even changing a constant value will require the engine to recalculate everything associated with it.

If this is not the case please tell me how you are handling the .fbx and materials as well as screen shots of both inside of UE4.



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answered Aug 04 '15 at 07:15 PM

avatar image Logan Bailey ♦♦ STAFF Aug 06 '15 at 01:36 PM

Hello R3Draw Studios,

I haven't heard from you yet. I was wondering if you were still experiencing this issue and if any of the troubleshoots/suggestions above were of any assistance.



avatar image FaustyWalk Aug 08 '15 at 08:10 AM


I'm experiencing the same since 4.8.3 (well, a couple of days after installing it). Everytime I load one of my 2 main projects, loading sticks for 5 minutes, CPU@100%, and RAM@95%. Then comes the editor and... 5000+ shaders compiling for 10 minutes !

These are the same projects since 4.1, didn't make noticeable changes on my maps, and my PC'specs are made to last till UE5.2 I guess ! So, as to sum up : didn't change anything on projects that used to load fast, and for 8 days, it's kinda hell.

I could also say that when building lights even in preview quality), lightmass uses 100% CPU too for a rendering time 10x longer than in 4.8.2.

The only thing I did is installing 4.8.3 and the launcher on D: (before were on C:) : maybe a folder cache issue ?

Ah, and I work with Substance plugin too (since 4.8.1, I guess), but never met any problem with it.

Best regards, Jerome

avatar image Logan Bailey ♦♦ STAFF Aug 10 '15 at 02:10 PM

Hey FaustyWalk,

If you would link me your dxdiag.

Then I can get a better idea of the limitations of your hardware.



avatar image Logan Bailey ♦♦ STAFF Aug 10 '15 at 06:31 PM

Hello R3Draw Studios,

As I have not heard from you yet and due to tracking issues I will be marking this link as answered.

If you are still experiencing this issue then please comment again.



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