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Found 83 results

  1. 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.
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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!
  8. 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.
  9. 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.
  10. 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);
  11. Hi guys, I can't get solution although it seems easy.. I would like to select point one on two but even with '(@ptnum+0)%2==0' (for odd id) or 'grouperange' sop I can't get the result i want.. (picture) Can someone show me the way? Thank you Nems.
  12. Hi all, I've looked for an answer on the forum but couldn't find exactly what I am looking for, I'm sure this is super basic question (I'm learning python right now). how can I reach point that are within different groups ? I want to do simple math operations for different groups of points, so the idea is that once I have access to points within a group I'll do something like MyAttrib = [p.attribValue("MyAttrib") for p in points] to do some statistics of MyAttrib Thanks Alex
  13. Hi. How could I convert primitive group name to a string attribute? I have few groups - group _01/02/03/.... and I just want to get numbers to use them as integers in vex, just to apply random color. int group_number = opdigits(@name); @Cd = set(rand(group_number), rand(group_number*1502), rand(group_number/1560)); Doing it with the name SOP, but what is the way of doing that in vex? Thank you Cheers Janis
  14. I apologize if the answer to this is somewhere obvious--through Googling I've found some of people asking this over the last 15 years, but no answers that work. I have a model that I need to crease before subdividing. Manually selecting the edges is impractical--too many round buttons with flat tops. How can I automatically select/group just the edges joining faces with right-ish angles? I've tried the "include by edges" and setting min and max edge angles, but that doesn't appear to do anything unless you chose "Edge Angle Uses Angle Between Edges," in which case it selects pretty much everything. Thanks!
  15. Switch if group

    Hey, I have a simple question, i would like to have an expression in my switch node to return true if it find a group of the giving name in the input one, or false if their is no group of this name and so, switch to the input 1. Thank you !
  16. How to delete dynamic points by group

    Hello, I made a rigid body simulation where I have different kind of pieces, like pavement, road etc. I grouped them in a group called "group1" How can I write this in vex in pointwrangle? Take the group1 and if the points in group1 are under -1 in @P.y then delete them. Thank you for your help
  17. Hello, hopefully someone can help. I have a creature exported from Maya as an Alembic where some of the normals were reversed. I’ve blasted out groups of those points and reversed the normals, then merged them back in. It works fine on frame 1, but as I scrub time the point numbering changes, so the points defined in the group are wrong. Can I make the numbering stick so groups work? What would a Houdini artist do? I’m primarily a Maya artist, and in Maya the CVs ID doesn’t change. Could it be to do with how I exported the alembic? I don't have a Maya licence at home so can't easily re-export to check the options.
  18. Hi, I have attached a screenshot, in the following, I want to create a group that will have all the primitves mentioned in the sourceprim attribute, it is an array type attribute and I am unable to combine them all to create a group, please help. Thanks
  19. HDA x C4D & Materials

    Hello ! Just have a noob question here. I'm starting to play with hda in Cinema4D and can't figure to achieve something. After doing some researches I can't find a way. This is pretty simple, if I made a hda in houdini who contains different colors for point or primitives groups, how can I apply different materials in these groups in Cinema ? Exemple : I've two box merged into an hda and I want to apply a material to each one in Cinema 4D, is it possible ? thanks for your help !
  20. FLIP group based on collision vel

    Hi there, I just Need a quick tipp here. I'm trying to generate a Group based on collisions, so based on collisionvel. I'm using a gasfield to particle to add the collisionvel (renamed to col) to the Geometry. Then I wanna use a Little bit of vex to get a Group within a Pop wrangle or a wrangle within a sop soler. if(@col !=0){ i@group_collided =1);} Unfortunately I cant get any Group based on collisionvel. How do I actually get a Group based on collisionvel?
  21. Hello, Can I get a little help please? I have an RBD simulation where a bridge's rope breaks. The first part is a glue contraints then it turns into soft constraints then I remove the primitives to break the soft contraints. But I have a part of the rope I don't want to break. So I put it into a group. How can I add that group into my primitive wrangle inside my sop solver as an exception. I mean I would like to break all the constraints ( primitives) except the ones in the group. Thank you.
  22. Hello everyone, the project > I'm working on short animations of a shirt flying in the wind. I decided to use houdini to learn it and use the new vellum solver. I managed to have really nice and quick result for most of the shirts but one of them give me some troubles.. problem 1 > One of the shirt is more like a polo so I would like to set differents constraints on the collar to make it more stiff than the rest. I tried to make groups and merge them but I think I'm missing something because it's not working. I can't find any related topics either.. maybe you guys can give me a clue on how to make this work ? I'm ready to experiment I just don't know where to search anymore.. problem 2 > On the same shirt there is 2 buttons. I'd like to glue them to the shirt for them to react like rigid body and follow the shirt mouvement but I don't understand how I can do it and how to place those news constraints in the graph.. First screenshot is a view of the collar and the buttons placement. It's a model from Marvelous Designer. Next a screenshot of the network view and third a view of the collar being not stiff enough ( : I can only do screenshoots of the shirt and can't really share my hip file because the design of the shirt is not supposed to be released yet. Thank you for the reading !
  23. Groupselection inside HDA

    Hey there! Im developing some HDA´s for my Bachelor Project! My actual Problem is about the Action Button for a Prim Group Selection. Right now im running the standart Action Button script below: import soputils kwargs['geometrytype'] = (hou.geometryType.Primitives,) kwargs['inputindex'] = 0 soputils.selectGroupParm(kwargs) But, of course it does refer to the Node above the Subnet. My question is: How can i refer to the Node above the Selction Node inside the Subnet ? Is it a Python Callback Script or is it something below the Action Button ? Thank you very much Max
  24. Hey there! Im developing some HDA´s for my Bachelor Project! My actual Problem is about the Action Button for a Prim Group Selection. Right now im running the standart Action Button script below: import soputils kwargs['geometrytype'] = (hou.geometryType.Primitives,) kwargs['inputindex'] = 0 soputils.selectGroupParm(kwargs) But, of course it does refer to the Node above the Subnet. My question is: How can i refer to the Node above the Selction Node inside the Subnet ? Is it a Python Callback Script or is it something below the Action Button ? Thank you very much Max
  25. Hi, I am sorry if this is a silly question, I want to group N number of points into 4 seperate groups, suppose 30% =group1, 20% = group2, 10% = group 3, 40% = group 4. In such a way that no particle is common in any of the groups so that I can use those groups to use popwind to effect them seperately and color them seperately. Please Help. Thanks.