Question Why my power node returns pink?

I am trying to create a heart shape function inside shadergraph. My initial point is to give -0.5 offset to uv so I can recenter it on the middle of the screen. When I tried to give UV.XorY power of 2, half of my output turned pink.

I know that part of uv should be below 0, but why is it pink? Is there another way around to make it return correct output?

Thanks for the help!

 

Plz.. any help

 

So numbers below 0 in shadergraph UV node will be considered as a NaN? Is there other nodes have same limitations?

 

I want to draw a shape like this, how can I do that?

 

nvm I made it, thanks for the help! And good to know there is a limitation of power node!

 

So now I am a little bit confused... After I split the output of Tiling and Offset node, and take R and G channel to do add/multiply/subtraction, I have a final outcome as below.
So in the previous nodes I have been doing a lot of calculations using U and V number, what does the heart image stands for? Does it stand for a final adjusted UV and assigned with a full white color?

 

Yes, sorry for the misunderstanding. I figure myself out.

I have a further question, how can I made a feather effect on its edge? Currently the edge is too sharp

 

Now I have a smaller shape and made a subtract to get the feather area I want. But I don't know what is next step to make it look like a feather edge

 

I guess you would need to construct function that fades on the edge - some kind of SDF. Obviously you can always render it (to render texture) and put antialias there, but I don't think this acceptable way.

In any case I think you should start new thread as it went from pink power node to heart shape, and now it goes towards antialias or SDF

 

SDF is a new area for me, I ll do some research and see if I need a new thread to discuss this. Thank you!

 

To be precise you already have some kind of distance function, the thing is it's not perfect.

If you check procedural nodes in shader graph you will see they don't use any branching because it produces zero-one result, and aliasing, plus branching is not cheapest in this case.

Anyway if you did the same as other procedural nodes, in your case you would end up with artifacts on sides and bottom:

Spoiler: result

It might be acceptable as it's not as noticable if it's big on the screen, but they are definitely there.
I am not the math guy, but I doubt it will be easy to create proper function without artifacts, or rather it's way more simple to simply create the SDF texture and you would be able to get very nice shapes and you can even control size of them to some degree.
You can check text mesh pro implementation, it uses SDF for letters.