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Everything posted by Alexandre

  1. collision of 2 smoke objets

    Hi everyone ! Do you know how to make collide 2 pyro objects, for example one pyro going in +y direction and the other going in the -y direction and pouuff ! In the pyro solver node you can define buoyancy direction but how to define 2 different directions ? multi solver ? Thanks !
  2. Get a specific vector from a vector array

    ahhh yesss, I understand thank you very much !
  3. Hi all, Noob question... I want to read the 3 components of a specific vector that belongs to a vector array as shown in attached screenshot I don't know where and in which format I have to put the point index and vector index. someone know how to do that ? thank you Alex
  4. Get point attribute within groups using python

    I found the solution here just change the points expression by : points = [str(point.attribValue("myAttrib")) for point in group.points()]
  5. 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
  6. Get point attribute within groups using python

    try to find answers on sidefx https://www.sidefx.com/docs/houdini/hom/hou/PointGroup.html but I fail to understand how to return the content of a specific group, group_0 or group_1...
  7. Hi all ! Do you know why the terrain erosion output varies drastically based on the initial grid spacing ? And how to overcome this issue ? I would like to get the overall shape obtained with a grid spacing of 0.5 (erosion, sediment, etc...) with a better level of details for close up scene. For this scene I've used the terrain shelf tool "Dunes" and let all the parameters as they are expect for grid spacing Thanks Alex
  8. python table import modifies data within the table

    thank you very much !
  9. Hi, I have a problem, I export a csv table from matlab (I tried single and double) and then import it in houdini but after the importation data are changed as you can see in attachment the real maximum is 4.3392 and is located at the first row, after importation the max is 999099 and is located at the row 485 :/ Someone knows what happend ? I have attached the table Thanks Alex BubblesDensity_debug.csv
  10. houdini 17 (popfluid)

    have you take a look at this ?
  11. Hi houdinist ! I am trying to apply saturn ring texture in mantra but I failed to reproduce the texture mapping in attachement (done in blender), someone could help ? I tried to rotate UV by an angle of 90° over each face, but I don't know how to achieve this hip file in attachment with saturn ring texture thanks Alex ring.hipnc
  12. UV map saturn rings in Mantra

    well it's working just stay on facet node
  13. UV map saturn rings in Mantra

    using the facet node I managed to split polygon, now I messing with UVs nodes
  14. UV map saturn rings in Mantra

    here is how it's done in blender but can't find a way to reproduce it in houdini (https://blender.stackexchange.com/questions/92812/how-can-i-assign-an-image-texture-on-a-circle)
  15. Houdini 18 Wishlist

    Mantra GPU

    Ohh I see... thanks

    Hi everyone ! reopening the topic because I am trying to do exactly the same thing but the gradient is repeating over and over each section, can someone help me to figure out where I make a mistake ? Thanks Alex colonization_growth.hiplc
  18. export VDB data to a 3D matrix into a txt file

    thank you very much it helps me a lot I am learning a lot from your example
  19. Hi everyone ! As says the title, I want to export scalar values attached to voxels (VDB) into a 3D matrix because I want to access to voxel data into another software (matlab) does someone know how to do that ? thanks ! Alex
  20. export VDB data to a 3D matrix into a txt file

    Can someone help me on that ? I am diving in python world and found some help using houdini doc : http://www.sidefx.com/docs/houdini/hom/hou/VDB.html I have basically written the function found at the link above, and I try to use this function on my vdb volume (filled inside) but it seems that the object has no attribute 'activeVoxelBoundingBox' :/ I'm 100% sure the problem comes from me, so if someone can put me on the right track I would be grateful thanks
  21. export VDB data to a 3D matrix into a txt file

    thank you !! I have to dive a bit into python coding, but I am sure I will get much quicker to the desire result with your given functions
  22. export VDB data to a 3D matrix into a txt file

    I will try to reshape data using voxel position
  23. export VDB data to a 3D matrix into a txt file

    I found some startup ideas here : https://www.sidefx.com/forum/topic/56423/?page=1#post-255419 I use a py node for data export, with vdb visualize tree because the py node from the link export data geometry spread sheet now I need to find how to reshape the vdb_float attribute (in relation to ptnum) from geometry spreadsheet in order to get a 3D matrix (basically, a matrix of 0 and 1 for a binary object)
  24. Attribute copy pscale from a point wrangle

    Thanks it works ! yeah I am currently learning VEX, thanks to cgwiki, entagma, houdini help, google and odforce forum coming from matlab (matrix) for data processing
  25. Hello everyone ! I can't figure out how to copy the attribute pscale (from a wrangle) onto a sphere... I am sure I am missing something because it should be straightforward see attached figure Thanks and sorry for the low level question