Henrik Gieselmann

Hi slavensb,

1.
The gird pattern truly has to do with the resolution of your sim.
The actual value has no true meaning without the Size of your Simulation Container.
It just meas that it will acutally split a 1 Unit length by 0.05. (so 20 Voxels per side)
So if your fire is small those are not a lot of values to sample from.
On the otherhand, if you have a 100m Smoke Column in the same framng you now have 2000 values to sample from.

2.
Are you sure you are interpreting both renders in the same colorspace?
Otherwise I am not sure where the problem stems from.

Best

Hey Arkahtek,

Prior to Houdini 12 I think there were UpRes Tools for that.
Those should still work and are probably the most reliable way to make sure your overall Sim does not change.

When increasing just the resolution so the calculation of many of your values will actually change a bit and you can not really prevent that from happening, So its is up to you to find where the “bending” occures and get that out of your system.

Also when looking at your file:
I would separate the floor Sim and the Nuke sim form another.
This gives you more System Power for each simulation, which allows for faster iteration of each and doing you pre Simulations at higher resolutions. Doing stuff at slightly higher resolutions earlier will help you not to have such a drastic change when going up with the resolution.

I hope this at least a little helpful!

Hey Lexpaintre,

for these questions please attach the HIP File.
Houdini is a rather complex software and to help you out, its really necessary to see whats going on!

Thanks