Moving droplets along normals

Support Particles and Physics Simulations
1

I have an object I wanna have droplets slowly trickling down on, I tried instancing an icosphere, and also tried using a volume to mesh, but I can never get the droplets to stick to normals and slowly trickle down.
This is the setup I’m trying now, but when I do, the droplet mesh is just a sphere (the shape the target mesh was before I changed it in edit mode)

image
image1906×493 85.5 KB

I can find multiple guides on aligning rotation to the normals, but I couldn’t find anything regarding this. I’ll admit, I’m pretty new to this, so the solution might be simple, but I just can’t figure it out.

2

Here is my try. Droplets rotates after passing the midline of the sphere.


AlignBothNormal-Tangent2
AlignBothNormal-Tangent21082×834 122 KB

3

Crossing the position with the normal does not make sense in the general case. Instead cross the normal with the up vector (0,0,1) to create a local tangent you can align the X to.

Good luck.

4

Thank you zeroskilz for your comment. yes. vector (0,0,-1) works better, and makes sense, :slight_smile: