Reverse UV actually swaps U and V?

Grasshopper
, ,
1

Curious thing I just came across and don’t fully understand. So I am using Lunchboxes Reverse UV component to set some surfaces’ (just rectangles standing upright) UV directions since I am using Panelling tools to create grids on them. So far so good.

Now I have some rectangles that are the other way then I want them (UV 0,0 is top right when viewed from the front rather than bottom left, which is the default), so I built a little something that just checks which directions things go and then reverses accordingly.

What I noticed though, is that Reverse UV does something different to reversing U and then reversing V. Basically UV go in the same direction as before when using that option.

Original UVs:

original
original1053×949 63 KB

Using Reverse UV from Lunchbox (option 3). note how U and V go in the same direction as before:

reverse_uv
reverse_uv1038×962 62.4 KB

Using Reverse U, then Reverse V:

reverse_u_then_v
reverse_u_then_v1064×938 60.9 KB

Why is this happening? Is it just a bug?

reverse_uv_ptch
reverse_uv_ptch1710×584 105 KB

reverse_uv.gh (19.4 KB)

2

IMO, I don’t think it’s a bug but that option No.3 misleads the users. What that option exactly means ‘Swap U and V’ not ‘Reverse U and V’. like Swap Surface Directionsin pufferfish plugin. BTW, Reverse Surfacein Parakeet plugin behaves exactly what you want…

Canvas at 00;35;56
Canvas at 00;35;561618×546 117 KB

3 Likes
3

Haha, wow okay, if that is the case, then that is some pretty terrible confusion caused by not being more clear. From the label it is pretty obvious what SHOULD happen:

image

Whoever is in charge of lunchbox components, please update the label so it clearly says “Swap U and V” or something. Also it actually makes no sense to have a swap U and V function in something called “reverse UV”.

I will go with the Parakeet version if that is working correctly.

Thanks, @HS_Kim

1 Like