VDP Density Ramp

#1

Hey guys,

I am relatively new to Houdini and I was hoping someone here could help me with a problem that I can´t solve on my own. I have particles that I convert to VDB. I would really love the density to decrease with the particle´s age. It is supposed to gradually dissolve and not just disappear when the particle dies. I have tried many different things but I cant get any results. This really does not sound like something that should be very difficult so hopefully you guys can help me with this.

Thank you!

#2

The point scale attribute (pscale) controls whether or not the point contributes (and is visible) to the VDB volume.

#3

So when I decrease the point scale it also decreases the density of the volume? Awesome thank you. I have to try that

#4

pscale decreases the points voxel contribution to the VDB solution.

For the purpose of VDB, each point is a sphere who’s radius is pscale, and who’s circumference affects (n) number of voxels. When the sphere no longer covers at least 1.5 voxels, then the point is no longer visible to VDB.