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Is there an issue using a vector 3 in place of blank normal map

I'm trying to reduce the number of texture samplers in an asset of mine, and I'm wondering if setting up a vector3 in place of a blank normal as shown in the picture below is troublesome for any reason. It looks no different to me. alt text

Product Version: UE 4.21
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asked May 25 '19 at 07:08 PM in Everything Else

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Tyguy717
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avatar image TorQueMoD May 25 '19 at 07:25 PM

I would imagine that it's the same thing mathematically. I wonder though if it's more or less intensive though. For example, you could use a blank normal texture at 8x8 resolution. If a texture sampler is just more expensive by default then a vector 3 would definitely work. If there's any issues you'll get an error when you save.

avatar image Luos May 25 '19 at 08:14 PM

Texture samples are much more expensive than a simple vector 3. And yes, you can use a vec3 as a replacement.

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