Colored Fluid That Doesn't Mix/Blend?

[bjohnston]

Hello, I am trying to create a 2D fluid (would be nice to be 3D) that continuously swirls around, but doesn't diffuse or mix. I have 2 emitters with different colors that no matter the settings, swirl together/blend. Any thoughts on what I am doing wrong? Thanks!

[david-schoneveld]

Well it's hard because you are emitting the same fluid around so when it reaches the other emitted color is sees it as one density not each emiter emitting different fluid, so it will blend the longer the colors touch. I wonder if you set the the shading tabs to be density and fuel and emit one as fuel. you might try to play with that, that might help but I don't think it will be perfectly what you are asking.

[jtk77]

I may not understand the question, but if you're wanting your fluids to not mix, why not just render them seperatly and composite them together in your post software ?

[bjohnston]

Hello, thanks for the replys. I was hoping do kind of a oil in water thing (except the oil doesn't float on top) where one fluid pushes the other around swirling but not blending or bleeding into each other.

[duncanbrinsmead]

One trick you might try is to use make the coordinateMethod = grid. This pushes the texture UVs around the grid. For the texture use billow. With the right settings you can create a single spherical blob of texture in the fluid:
textureType billow
coordinateMethod grid
coordinateSpeed 1
depthMax 1
frequency .1
textureOriginZ 0.165
billowDensity 0.05
randomness 0

This blob then will get pushed around in a fashion similar to density, but will not break up, but instead get streaky like taffy.
Note that you could also texture Color and set different colors in the colorRamp. The colors will get get pushed around with the texture and keep their hard boundaries.
It would be tricky if you wanted to start with blobs of different colors. If you are doing it in 2d, you can use the outCoordinate attribute on the fluidTexture2D(coordMethod = grid) to drive the uv coordinates of a 2d texture such as file.

Duncan

[bjohnston]

Thanks Duncan. I'll post the results.