VolumeSampling: Non-uniform particle distribution on a bowl-shaped mesh

[Jinjinjinnn]

Hi everyone,

I'm currently using the VolumeSampling tool to generate boundary particles for a static bowl mesh in my SPH simulation. However, I'm encountering an issue where the sampled particles are not uniformly distributed.

As you can see in the attached image, I'm encountering two main issues. First, the particle density is significantly higher at the bottom of the bowl compared to the top walls. Also, increasing SDF resolution(two results in the middle in image) results in a wierd aliasing-like pattern of voids. My goal is to achieve a dense, uniform distribution throughout the entire volume of the mesh.

A key constraint for my scene is that the particle radius must be fixed at 0.02 to match the fluid particles, and that it must be dense enough.

Here is a summary of what I've tried so far without success:

• Using different sampling modes (mode 2 and --mode 4).
• Increasing the SDF resolution (30 ~ 100).
• Scaling the input mesh to be larger.
• Adjusting the mesh's polygon count (using both higher and lower subdivision levels).

Despite these attempts, the problem hasn't been solved.

Could anyone suggest how to achieve a more uniform particle placement? I'm wondering if I'm missing a specific parameter or if there's a known sensitivity to the mesh geometry (e.g., thickness, curvature) that might be causing this.

Any advice would be greatly appreciated. Thanks for this fantastic tool!

[janbender]

Can you provide the mesh file?

[Jinjinjinnn]

bowl_high.zip

Hello,
Thank you very much for looking into this.

I have attached the requested mesh file (bowl_high.obj) as .zip format. Please let me know if there's anything else you need from my side.

Thanks again for your help!

[janbender]

I do not see the problem, have to take a closer look in the next days. A fast solution would be to use a poisson disk sampling in Meshlab.

[Jinjinjinnn]

Thank you for the suggestion, I'll try Meshlab. Thank you!