Skybar
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Everything posted by Skybar
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Yeah seems a bit weird. Probably an attempt to solve something with math (tying it gravity?) instead of just exposing the correct parameters. Which is weird if it's supposed to make it simple, because we get a few more parameters that are harder to understand for buoyancy - instead of just having the 3 well known ones (direction, amplitude and ambient). Delete that expression in Bouyancy Lift on the Gas Buoyancy DOP and use it normally seems to work well.
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general: attribute reading / setting in any node
Skybar replied to Follyx's topic in General Houdini Questions
Depends on what you mean exactly. In your example you can create a detail attribute and grab it in the parameter with expression, for example: detail(opinputpath(".", 0), "amount", 0) That will grab the value of detail attribute called "amount" from the node that is connected in the input. -
The OpenCL node errors in your scene for some reason (im on 18.0.416), so can't test. But your problem is most likely reading and writing to the same attribute in the same kernel. You want to use a Write Back Kernel for this. If you hover over the "Use Write Back Kernel" it explains a bit what happens.
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For most volumes you will need a velocity volume and use velocity blur. For this case you could also create the volume -> pack it (Pack SOP) -> then move it with a Transform SOP. The transformation data will then be on the packed object and it will blur correctly.
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I think the main problem is that you are adding disturbance everywhere all the time. A popular method is to use the speed of the velocity field as a control field for example, so you scale the disturbance amount with how fast the smoke is moving.
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For Deformation Motion Blur (stuff happening in SOPs), you have to set "Geo Time Samples" to at least 2 on the Mantra ROP.
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Too much disturbance probably.
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add voxel padding to vdb, what's the equivalent of volumeresize for vdb?
Skybar replied to karen's topic in General Houdini Questions
VDB Activate -> Expand -
It's because the ramp is a float. You are saying that vector = float. If you skip the ramp and do vector hillProb = rand(seed+2); you will get a random vector.
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Any idea why? FLIP Sim losing cache in memory when scrubbing?
Skybar replied to HM_2020's topic in Effects
You mean you are flipbooking while simming? You could try the "Leave Playbar at Last Frame" on the flipbook options. -
Separate rigid from soft body point deforming pieces (in alembic cache)
Skybar replied to haki's topic in Animation & Rigging
Try the Extract Transform SOP. -
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There is a preset on the point wrangle to grab second input attribute by id:
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It's actually an eighth of that, around 200 million voxels. Keep in mind the resolution of the volumes is particle separation * gridscale.
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Set the "Missing Frame" option to No Geometry on the file cache.
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I gave it a try, might not work on more complex geo but it works on your box . I find the unconnected points based on normals, and then put those points into the original primitives and rebuild them. I did something similar a while ago where I had lots of curves making up a tree. The branches wasn't attached to the branch before it, so I needed to find a way to connect the base point of a curve into the middle of another curve where there wasn't a point to attach to. That was curves and this is not, but it seems to work well for this too, albeit I turn the polygons to curves and then back to polygons. dv_CrackedEdge.hipnc
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Instead of setpointgroup you can: i@group_groupname = 1;
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move 3D positions but keep screen positions.
Skybar replied to Spyrogif's topic in General Houdini Questions
Move in Z from camera: vector campos = point(1, "P", 0); vector dir = normalize(@P-campos); @P += dir*ch("amp"); -
rand(stamp("../copy1","id",0)+0,47) You made mistake here. It should be 0.47 with a dot, not comma.
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What kind of primitives does the alembic contain? I've had problems with crashing alembics before if the animators include the animation controls by mistake. If you can, try and load different parts (under the Selection tab on the Alembic SOP) and try and find what makes it crash.
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Depending on what you are doing and how your geo looks like, you can also abuse compiled foreach loops to multithread otherwise single-threaded stuff.
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Ah nice catch! I haven't used the new sourcing system that much and didn't know about this. In the old Source Volume DOP you could use only "vel" fine even if it was consisting of .xyz scalar volumes. With the new Volume Source DOP however, it is as you describe.
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[solved] getting a smooth connection between curve and geometry
Skybar replied to Whatsinaname's topic in General Houdini Questions
Yeah you could transfer the normals from the geometry to the curves afterwards, and ray them to the surface. And then some more smoothing and resampling. Could be a little jittery though. -
[solved] getting a smooth connection between curve and geometry
Skybar replied to Whatsinaname's topic in General Houdini Questions
Threw something together quick, might get you started dv_smoothcurve.hipnc -
It can be done in a number of ways, I had a go at it. Hope it helps! dv_alignPlanks.hipnc
