nico_venster Posted August 19, 2015 Share Posted August 19, 2015 Hello, This might be such a simple question/answer... I'm have animation, done in Maya and the scene scale was set to centimeters. I exported it as an alembic and imported it into Houdini. Now it's massive (or at least in relation to the grid) and I've got to add some effects to it (more specifically, the flat tank for), the trick is that I have to convert the particles/fluid to geometry and export it back to Maya to fit with the rest of the shaders and rendering. Would it be best if I just scale the alembic uniformly down in Houdini and work off of that? (I have parented it to a null and scaled the null to 0.01 and still got kinda weird results). Any insight would be greatly appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
Sierra62 Posted August 19, 2015 Share Posted August 19, 2015 It always is recommended to scale that way, and then scale it back prior to exporting back to Maya. Can you explain what kind of weird results you are getting? Quote Link to comment Share on other sites More sharing options...
Atom Posted August 19, 2015 Share Posted August 19, 2015 If you are doing a fluid sim, however, you want to keep that at the correct scale for the final scene measurements. I would not arbitrarily scale something down to fit the grid unless the measurements match. Scale everything else around the desired fluid sim size. Quote Link to comment Share on other sites More sharing options...
nico_venster Posted August 19, 2015 Author Share Posted August 19, 2015 Shot for the feedback, After I imported my alembic into Houdini (a basic segway model), I parented it to a null and scaled the null to 0.01 (the main reason for this number is that I am using that scale in Realflow as well for this project as well, I realize now how arbitrary it must sound =/). I should note that the animation on the segway on its 0.01 scale moves approximately 7 units every frame. To try and keep the effect that I want as simple as possible I parented a sphere to the segway's wheel (so using the sphere as the source rather than the alembic). I then selected the flat tank shelf tool and applied it to my moving sphere. The effect that I'm looking for, in this case with the whitewater_import are splashes emitting from the sides of the segway as if it's riding through water/paint. Like a car driving through rainwater and the water on the sides of the wheels spray particles. I realize though that this might not even be the best solution to the problem that I'm facing, but as a fairly newcomer to Houdini, this is the approached I started. sc02_sh27_04_flat_tank.hipnc Quote Link to comment Share on other sites More sharing options...
nico_venster Posted August 19, 2015 Author Share Posted August 19, 2015 I'm trying to upload my alembic as well but I'm obviously doing something wrong, when it finishes I get "Error No file was selected for upload" The file is 9mb... Quote Link to comment Share on other sites More sharing options...
lukeiamyourfather Posted August 19, 2015 Share Posted August 19, 2015 Houdini units are one meter as far as dynamics are concerned. The geometry will likely need to be scaled by a factor 0.01 like you're doing and then by 100.0 when exporting it. I typically do the scaling in SOP rather than OBJ network as not all networks in Houdini treat the OBJ level scale the same. Quote Link to comment Share on other sites More sharing options...
nico_venster Posted August 19, 2015 Author Share Posted August 19, 2015 Ah, that clears that up for one, thanks Luke! Quote Link to comment Share on other sites More sharing options...
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