multiply   a * b
screen   1 - (1 - a) * (1 - b)
darken   min(a, b)
lighten   max(a, b)
difference   abs(a - b)
negation   1 - abs(1 - a - b)
exclusion   a + b - 2 * a * b
overlay   a < .5 ? (2 * a * b) : (1 - 2 * (1 - a) * (1 - b))
hard light   b < .5 ? (2 * a * b) : (1 - 2 * (1 - a) * (1 - b))
soft light   b < .5 ? (2 * a * b + a * a * (1 - 2 * b)) : (sqrt(a) * (2 * b - 1) + (2 * a) * (1 - b))
dodge   a / (1 - b)
burn   1 - (1 - a) / b

Blending formula

https://www.ronja-tutorials.com/2020/02/11/material-property-blocks.html

#Instancing

https://github.com/smkplus/KamaliSplashScreen

Custom Splash Screen
Filling screen with water

this is a simple trick to make this

I had this idea and did a little prototype for a geometric fluid. Needs more work of course. Nowadays we can bring fluid-sims into realtime-engines by putting vertex data into textures and re-building the mesh every frame.
I tried something simpler: using a “tile-able” fluid-mesh and just moving it along a spline. This test is made in 3Ds Max. Need to checkout how to move meshes along splines in Unreal. Here the loop is very obvious but maybe with a mesh with less unique areas and forms it will be hidden better: