Triangle Coordinates system I came up with for my Color Picker. It feels like it's basically a variant of Barycentric Coordinates, but I'm actually not sure about it. There is no constraints on the sum of the parameters t₁ and t₂. The only constraint is that they must be the values between 0 and 1.

But maybe this *is* a variant of Barycentric Coordinates, I don't know, I'm not good at math.

You can play with the coordinates here: https://tsoding.github.io/triangle-coordinates/

UPD. @laurentiuNiculae discovered that this might be something related to Duffy transform