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Hey there,
I´m collaborating on my short film with a houdini guy and we´ve been trying to compare some stuff.
Some of it might be like comparing apples and oranges, but maybe you can answer these:
1. The most important question: How do we compare resolution? Is it as simple as 1 houdini voxel = 1 phoenix grid cell? Someone on facebook suggested that...
2. I noticed in the vdb I got from houdini, that there was a much larger range in opacity in the grid for the smoke. I´m not sure if thats matters in any way, but I´m having a harder time tweaking that for some reason and it also seems to render much slower, but that might just have been, because due to the larger range I ended up producing a curve that made it less dense and more transparency usually means higher render times.
The question is: what would give me a bigger range of opacity in the smoke rollout?
3. We also noticed that the phoenix caches were much smaller in size. That turned out to be because teh vdb from houdini had a lot of fields (aka channels) we wouldn´t need, so once he cleared out the caches were closer in size.
But that left me with the problem in return, that my vdb files from phoenix ended up being way too big. 1gb .aur became 4.5 gb as a .vdb.
I used the commandline tool to convert .aur to .vdb, but there is no option to exclude channels from export.
If thats not possibly in another way, that would be on my wishlist....
I´m collaborating on my short film with a houdini guy and we´ve been trying to compare some stuff.
Some of it might be like comparing apples and oranges, but maybe you can answer these:
1. The most important question: How do we compare resolution? Is it as simple as 1 houdini voxel = 1 phoenix grid cell? Someone on facebook suggested that...
2. I noticed in the vdb I got from houdini, that there was a much larger range in opacity in the grid for the smoke. I´m not sure if thats matters in any way, but I´m having a harder time tweaking that for some reason and it also seems to render much slower, but that might just have been, because due to the larger range I ended up producing a curve that made it less dense and more transparency usually means higher render times.
The question is: what would give me a bigger range of opacity in the smoke rollout?
3. We also noticed that the phoenix caches were much smaller in size. That turned out to be because teh vdb from houdini had a lot of fields (aka channels) we wouldn´t need, so once he cleared out the caches were closer in size.
But that left me with the problem in return, that my vdb files from phoenix ended up being way too big. 1gb .aur became 4.5 gb as a .vdb.
I used the commandline tool to convert .aur to .vdb, but there is no option to exclude channels from export.
If thats not possibly in another way, that would be on my wishlist....
Note that Phoenix does not remove any data from the cache files, so all grids in VDBs from Phoenix will be as large as the container for the moment.
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