Why does MSAA x8 make Alpha masked materials transparent?

Development Rendering
1

Doesn’t happen with MSAA x4 or x2.

Whats the cause of this and are there any solutions?

2

Bumping this, in case someone can drop a hint, I really need to know.

Thanks,

3

My last attempt in hopes for an answer because i’m stubborn.

4

Dusting that topic up - still a bug.
tested in 4.27, Forward rendering and material with Blendmode Masked. 8x MSAA makes the material look 50% transparent

5

It’s a feature, not a bug. MSAA allows for a technique called Alpha To Coverage which provides a few steps of order independent translucency for masked materials.

1 Like
6

I have yet to understand what you just said, unless its sarcasm and i missed it.

Are you seriously telling us that translucent objects appearing wrong is a feature?

7

Yep. As I linked, the feature is called Alpha to Coverage and is functioning as designed.

8

How is something looking as bad as it does a feature and is functioning as intended?

9

Must be a bug then, guess you should report it?

10

I did years ago.

11

My apologies, you’re right this is a bug.

Target fix is 5.1

@jazznazz

1 Like
12

You got to be kidding me! LOL

13

If you log in and vote up the issue, it may become a higher priority

14

No I mean the rest of us in the real world are still on UE4 I don’t care about 5 +

Edit: it may be redundant though, I learnt upscaling with minimum or no MSAA yields better results vs Performance let alone have MSAA at 8X.

1 Like
15

I have run into this problem on Unreal Engine 5.2. It now appears the problem affects all levels of MSAA…very frustrating.

See my investigation that I posted on the Quixel support forum.