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How can I add an image sequence to a light function?

I have a looping image sequence that I want to apply to a spotlight.

I want to project the image sequence animation like a film or video projector would but using a spotlight

I have tried creating a spritesheet of the animation and using that with a flipbook and then connecting that to a light function material.

I am getting the following errors. Error [SM5] Light function materials must be opaque. Error [SM5] Function FlipBook: (Node TextureSample) MipBias is only supported in the pixel shader

Any help greatly appreciated -Thanks!

R

Product Version: UE 4.16
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asked Nov 04 '17 at 09:54 PM in Using UE4

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rogrobin
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avatar image rogrobin Nov 11 '17 at 03:19 PM

Bumping this in case anyone can help..?

avatar image ColdSteel48 Nov 11 '17 at 03:56 PM

Show us your material and a light function.

avatar image Mako2003 Jan 17 '18 at 07:53 PM

Would love to get a response too i cant figure it out... Anyway here are some pics: https://i.imgur.com/trNNXVC.png https://i.imgur.com/KV5p0YJ.png https://i.imgur.com/3xTSTTH.png https://i.imgur.com/wd1lmG8.png

I have tried making it a separate material function and then calling it into the actual material but after i put the output to emmisive color the material function just shows the small error message https://i.imgur.com/z67ZRY9.png

Any help is appreciated.

PS:sorry for bad english

avatar image Daniel Mø Dec 23 '18 at 03:47 AM

The Flipbook node has a pin "Use Mip Bias ..." which defaults to true. Use a bool to make it false and it works

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