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Is it possible to make a mesh transparent without changing its material?

I have a telekinesis spell in my game, it functions like Half-Life 2's physics gun.

I would like to make the grabbed object to become transparent. I know how to do it by changing its material, but my question is, is there any way to do it without changing the object's material (which most often is BLEND_Opaque)?

I tried hiding/un-hiding the mesh in the Tick event, but it's not fast enough to look nice.

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asked Jan 12 '15 at 06:43 PM in Rendering

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2 answers: sort voted first

Hey lxiguis -

While the Opaque Blend Mode will not allow you to get the type of quick fade out you are looking for you can use the Masked Blend Mode and a setup like below to do a faux fade out:

Here is all you would need in the Opacity Mask Channel:

alt text

Here is the Effect Running:

alt text

Thank You

Eric Ketchum

fauxfade.jpg (99.2 kB)
fulleffect.gif (4.2 MB)
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answered Jan 14 '15 at 05:37 PM

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Lovecraft_K ♦♦ STAFF
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avatar image Ixiguis Jan 14 '15 at 08:17 PM

Cool, thanks!

avatar image kuo Sep 20 '15 at 07:27 PM

Hi, I am using UE 4.8 and this is the error I got after using using this with the opacity mask: undeclared identifier 'output parameters'. Did you just connect this whole thing to the opacity mask?

avatar image Lovecraft_K ♦♦ STAFF Sep 21 '15 at 05:22 PM

Hi Kuo -

Yes, that setup is plugged directly into Opacity Mask and then I use the Scalar Parameter in a Material Instance to drive the fade you see in the GIF above. Can you take a screenshot of your material setup including your Material Attributes Detail panel and I can take a look to see if anything obvious stands out.

Thank You

Eric Ketchum

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Could be better if you create a Material Instance from the Actor´s Material, create a Material Expresson constant, with value 1, and make it as a param of the Material Instance.

In you blueprint, just change the value as you need, could be using a timeline for example.

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answered May 08 '18 at 10:23 PM

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