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Found 98 results

  1. Hi guys, I have been running into this issue for a few times now and I really need help on this. The group Expression or sometimes even in VEX my group is not selecting all geometry intended, see image below. See how primitive 159 is not selected even it has N val of {1,0,0} I also attached a hip file as example.groupexpression.hip
  2. Group hard edges

    I am trying to groups the hard edges of a model like the one you see in the attached image but it seems weirdly difficult. I am sure there is an easy way to do this group_hard_edges.hip
  3. Hello! I am undergrad student and I'm fairly new to both Houdini and this forum, so any help is appreciated I have a problem with selecting a box from a set of boxes based on distance. I did some research and found out that this can be achieved with distance from geometry node. So I have scattered boxes and I can mask some of these based on distance with this node. But my problem is that I could not extract those entities from the group. Is there a way that I could pick the closest box, and then use that box as an input for the rest of the process?
  4. Hi, Is there any way to create a different group for each edge loop I have selected so I can later make a name tag out of each loop and run a for each loop operation per loop? In this case I am creating my loops via a SOP groupfindpath, but that is not that important here, any way to create one group per loop would be super helpful. Thanks!
  5. i have an initial selection of primitives that i append to over time. How can i track the birth and age of the newly added primitives in the group? i m stuck in the birth-age problem, but i have managed to isolate the newly added prims to the existing group. add_to_group_and_track_age.hip
  6. Hello, I am trying to extrude faces of a mesh depending on it's prim number, I tried to do it in the "Group" parameter, but it's not working. Any help is appreciated!
  7. Variable Surface Tension

    Can somebody please help me with this surface tension problem. I have a scene and i want a different surface tension to apply to different group as show above. I want the group 1 to have higher surface tension and group 3 to have a lower surface tension but my setup is not working . SurfaceTension.hipnc
  8. Shop_Materialpath as primitive group

    Hello everybody ! I have a little problem with an fbx that I import on houdini. The object contains several textures, the concern is that to apply them I have to use groups. The fbx contains the shop_materialpath attribute, but I don't know how to use it to assign my different textures ... It seems to me that the easiest would be to use this attribute to create groups to finally assign the textures to these different groups? But I don't know how to "extract" this attribute to do something else ...
  9. Select only concave edges

    Hi! I would like to select only concave edges (green edges on picture). Let's say I have a cube, with a small extrusion on one face. I know I can select edges by angle, but it selects concave AND convex edges. Any idea how to do it procedurally? Thanks!
  10. Vellum Group by creation frame

    I have a vellum sim in a dopnet set to continuous and activation set to $FF%20==1. Which creates a vellum cloth on every 20th frame. How can I set a group to each emitted cloth so i can separate them post sim? thanks in advance for any help.
  11. POP proximity to group

    Hi everyone! I have a very basic POP setup. The side with positive P.x belongs to group "right". With a "POP proximity" node I check nearest particle. My goal is to fins if particles from "left" have a nearest neighbour from group "right" and if they have color them red. In my opinion it should be simple. The nearest attribute gives you a number of a nearest point and you use it within "inpointgroup" to check if nearest belongs to this group. If it belongs color red the point that has a current nearest as its attribute.... But it doesn't work. I tried to put the same code in in a "geowrangle" but it wasn't working also there. (in general what's the difference between "popwrangle" and "geowrangle"???). I trief to solve the problem avoiding "inpointgroup" by assigning the attribute ntest to particles from the right and checking in popwrangle within "point(0,"ntest",npt)" if a nearest has the ntest attribute equal 1... but again things aren't working... Apparently "point" doesn't work that way in POPs or I use ot wrong... don't know..
  12. RBD Hold active attribute

    Hello guys. i creating an group to activate the pieces to start to fly. im using an sop solver in the pre-solve input to create those pieces active=1 However while move outside the region bound. it loss this attribute and simple stop. i tried to "hold" the attribute 1 using an max function, but i didnt work. please help me thanks in advance. ps: i uploading an simples setup of this hold_active_att.hip
  13. Hi, I am having trouble having my custom HDA group selection to behave the same way as existing nodes to work with group selections. For exemple, if I select certain edges of my object and create the node "Normal", it will automatically assign those edges to the node group, however, If I do the same with a HDA the result is not the same. I can add the "selectGroupParm" script to the group action button so I can create the group after the node creation, but I was wondering what extra steps I need to make in order to make it automatic when summoning the HDA. Thanks!!
  14. Hello there, Before in Houdini GamDev has a sop called group by attribute. So if I use name node to group primitives, pack them then just use the group by attribute node Houdini will recreate all the group based on the name attribute I had In Houdini 18.5 it has a node called group from attribute boundary which does similar thing but I can't figure how to set it up so it can auto create group based on name not manually set up each name like in the photo I hope I explained it well. Thank you for reading this
  15. I want to know if a group exists in my geo stream. Found a solution in this old topic but doesnt seem to work Any ideas? check_for_group.hip
  16. POP stream/group in wrangle

    Hi everyone. I have a pop stream called "stream_main" and is written that its a pointgroup. Though when I refer to it in a wrangle, if doesn't work. I don't know why.
  17. Hi guys; How can I select points in a geometry randomly over time, and send them into a group (until the end point)..? Thanks for helping. Random Points to Group.hip
  18. I have put some instanced geo as a bounding box in the group node. It works at someplace perfectly fine but at other places, it does not select all the points inside the bounding obj or selects points outside. I have attached the images and hip file. I want to know if it is a bug or it really just doesn't work with instanced geo or there is something else I am doing wrong? Thank you. cactus_01.hiplc
  19. Group create vex removeprim

    Guys, please help, I can’t understand how to write the conditions for creating groups, so that after deleting a primitive, a group is created for primitives that have been deleted and those that have not been deleted
  20. Hello, I am stuck on this. I have been trying to sort points from left to right and follow the sequence. I used the sort node but it is not sorting as I want it. How can do it? Please find the image attached below
  21. Select collision particles

    Hi, I have a geo diving in flip Problem: I like the ripples at the beginning, but I want to slow down the ripples that get too high Question: how can i select only the particles that collided with the geo? I want to add the particles that collided with the geo to the group and limit their speed or maybe add a drag force to the selected group. Is this approach correct or is there any other way to keep the low ripples and slow down the fast ones? Thanks IMG_6198.MP4 Also online preview https://yadi.sk/i/yxXCQ8Yghz11Jg
  22. I'm trying to visualize only attributes that are belongs to a certain group. Do so by using Visualizer group with visibility set to group. But it just doesn't work. Tried to use group expressions, group names that I created before Visualizer SOP, nothing works. Tried Houdini v17.5 and 18.0.499, not working. Attached simple example, where I'm trying to visualize P attribute using group visibility option. group_visualizer.hipnc Thanks!
  23. I want to save the frame where the point joined to a group. I try this method: Its work perfectly, but my geometry have animation so i try to combine with this method: https://www.sidefx.com/forum/topic/21416/ But its just drop to zero my attribute after its get in the group.
  24. Point Group From Texture

    I am trying to do a vellum simulation and was wondering if its possible to select points and group them based off a texture map. What I would like to do is build a UV for the model I am using and then just use a black and white map maybe to select points based off the map. My issue is that I am Remeshing my object on import and have to keep adjusting the remesh to get the right amount of points for my simulation. However the shape never changes so if I could use a texture map to select the points I need every time I remesh it would save me from having to re-select them. Hopefully this makes sense.
  25. setPointGroup behavior

    Hey, I have 2 scatter node with 30 points on each of them. I wired the two in a pointwrangle. I used this code and I am wondering why the setpointgroup is running only once and not as the doc suggest : "This node runs the snippet on the detail or every point/primitive/vertex (depending on the Class parameter) in the input geometry." This is probably something I missunderstood but I would be grateful if someone can explain me how it's really behave. Here is my code : @group_basePoints = 1; vector npos = point(1, "P", @ptnum); int newpt = addpoint(0, npos); setpointgroup(0, "basePoints", @ptnum+@numpt, 1);
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