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Found 37 results

  1. Noise in particles

    I sim a particle system, I want to put some nois after sim but Cd color is not baked at the particles, how can I baked it ? does Anybudy have clue ?
  2. Smoke changing color

    Hello! I am new to Houdini, but am attempting a fairly complex effect. I need to emit smoke and particles from a piece of geometry, with these specific characteristics: The smoke and the particles must start off as grey. The particles should be emmited from a black-and-white mask that is mapped onto the emmiting surface (white=emit, black=no particles emmited). This texture should be animated. The color of the particles should be defined at particle birth by another moving texture (an animated fractal noise, for example). At 1/3 of their lifespan, the smoke and the particles would change into two different colors (blue and pink,. I am guessing that the right way to do this is to start with the particles, and then copy the color attributes onto the smoke. The two should move together, so... should I first do the smoke, and them move the particles along the same forces? Any help would be greatly appreciated! cheers, Diego
  3. Hello, Small problem this morning. I have a flower in Houdini that's been cached out as a .bgeo file. The flower opens and is supposed to emit particles, which I'm controlling the location of emission with a paint node and a timeshift after that. Just following the tutorial, as you do. After the timeshift is a scatter with the Density Attribute set to Cd and after the scatter an Attribute Interpolate node so I can put the points back onto the moving petals to get a velocity from the points to emit water and so on. The problem is that the color value from the paint doesn't stick to the moving bgeo geometry and when the frame moves will break up the color, thus scattering the particles in a new way on every frame. Even a quick copy paste from his .hip file to mine doesn't work after I change the paint node to fit my geometry. Every value is the same and I'm confused. Is there a better or any other way to lock color values onto a cached bgeo file?
  4. Hi, I'm trying to pass the color from polygon to VDB, transform the VDB then apply the color back to polygon but I don't know how to do. I tryed to use "VDB advect points" but I can't figure out how it's working and if it's the right solution. Charles VDB_color_uv.hipnc
  5. Hi people, I got some problem with color loss in my balls array attached to point box. Everything is working as intended until I transform my array to RBD Object. In my scene I would like to have balls bounce around and collide with everything but I would like to have some materials and distribute them randomly on them as well. Everything is working but color is lost inside Assemble node at the end in Attribute Wrangle node called : add_name_attribute. I have no idea what happens but this node is making additional groups from my balls and in the end there are many groups which I don't need. All balls are turning grey in viewport as well. If you could have a look I would be grateful. ajz3d_randomize_materials2.hipnc
  6. Sine waves color

    Hi, I have a very basic question. I have a black and white sine wave function applied to a grid and i would like to change the color of each ring (black and white). How can i achieve that? Attached is the file i'm talking about. Thanks! VEX_SineWaves_ODF.hipnc
  7. I'm creating a group from the box sliding over the fractured grid and assign the Color from Black to White in that group. How would I randomly delay setting the color in this example, so it's not a straight line of assignment. I tried creating a random offset when it gets assigned into the group, however unclear how to increase the offset counter per frame, so I can assign a formula in setting the Cd.
  8. transfer Cd to vdb from particles

    I wondering if this is even possible? I'm animating points through a solver and then turning them into vdb's. I want to apply a random color on each particle. Everything seams to work until I convert to polygons. I tried to apply an attribute transfer after the convert but as you can see in the attached image the scale is off? If anyone can provide further assistance... It would be greatly appreciated! (I also attached a reduced file since I cannot send the actual scene) Thanks, vdb_HelpMe.01.hip
  9. flame gradient shading

    hey guys! i m trying to make like reference image with houdini. but it's not easy how can make like this reference image?! i mean blueish -> transparency -> bright i need help! verrrrrrry thanks for any tips or advices.
  10. Hi, I'm trying to replicate the way you can set color for a particle's "initial state" in a Maya particle system. I've looked through docs, tuts, etc, and have not been able to get this to work: Here's what I got so far: ---------------------------- I've scattered points over some terrain Geo, used a point Vop to create noise based color for the Cd attribute on the points, then used the points as the initial geometry in the popObject. The idea is to have textured "dust" blow over the Geo (I'm driving the pop animation with a Pyro sim). The animation works well, but I can't figure out how to transfer the Cd attribute of the scattered points to the particles. I played with creating the color with a PopVop in the Dop network, but the color is assigned by position so the particles animate but the color does not. I've attached my test scene. I'd appreciate any clues; thanks in advance bcs_partDustTest_v01.zip
  11. mandlebrot color issue

    i created a mandlebulb/mandlebrot and i want to animate it with colors that change like left 30% green right 70% blue and it changes over time. I do not know how to accomplish this. Please help. mandlebrot_016.hip
  12. In Houdini, can I colorize a volume (either VDB of Houdini volume) based on the voxel location in space? E.g.if I have a cube-shaped volume, can I color its quadrants differently?
  13. Hi guys I'm making explosion fx with box, (like lego movie) and how do you put explosion color on box?? I tried to get density, heat or temperature attribute and multiply ramp param but I think it doesn't work or I did wrong way. If you have any ideas please help me thank you CubeEXP.hip
  14. Geometry Color transferred to smoke

    Heya folks, I've been trying to test out a setup where a volume inherits color from geometry which in turn is used to color smoke simulations. I have a attached a file with my setup - where I'm initializing a tempCd field and then transfering that to a Cd field with gas calculate and then advecting Cd with vel. However, the issue with the sim is the fact that it refuses to initialize multiple colors. I hope somebody can help me figure out how to troubleshoot this issue. Thank you! smoke_color_sim_test.hipnc
  15. Colozize SDF

    Hi there! I'm looking for a method to colorize SDF (VDB) based on an attribute, which I made, for ie: the distance along the X axis. (The surface created at render) Any help would be appreciated.
  16. POP Fireworks - Color from Image

    Hey guys, I have to create fireworks that turn into some specific shapes. Just like this: I have an workflow idea working with colors. It goes like this: -Simulate standard the fireworks; -Go to a specific frame where the where the starbusrt* is fully formed; -Apply the color at this specific frame; -keep that specific color assigned to individual particles through the whole simulation; (not working) does it make sense? I'm having problems to achieve this last step. what I'm doing is: -caching the simulation; -apply the colors; -add a timeshif to the "rest" frame (89 in this case); -copy the color attributes from this frame (89) to the animated simulation; I guess it happens because the particle count changes during the sim. Any idea on how to proceed? (Scene file is attached) Thank you, Alvaro *starburst is the round shape Fireworks.v1b.rar
  17. Sup guys, anybody knows how to read houdini color attributes in octane for c4d? I tried exporting as alembic, that gave me a vertex color tag wich I plug into a vertex map on a material, but isn't working, the native c4d render seems to load it, any tips on this? Thanks!
  18. Hey Guys, Im working with a particle simulation and I cant seem to figure out how to get the colors generated in the particle sim to apply to the shader being applied to the instanced geometry. Any help would be awesome. OT111_0010_glitter_v001.hip
  19. hi every one, whenever i pick a color from the final render i got this weird result , some times it's slightly bigger and other it's lower , i'm using default value in houdini didn't change any things in render or linear workflow any idea ?
  20. Save Cd to Bitmap

    Sup guys, I've painted some stuff on an object and now I need to export this object to another software. I've projected UVs properly on it and now I'd like to export this data as a bitmap. I've found some info on sidefx forum saying this (on quote) but i'm quite new to shops and have no idea on what's going on there. Can anyone help me out with this, pls? My main doubts are: Should I do this in Shops? What is the Cf output? Use mantra -u option? wut? Thank you, /Alvaro
  21. Hey Guys , i have a scattered points on a surface , and this points have noise as their color , i want to make a volume from those points , and also multiply volume density with points color , but cant find any way to transfer attribute from points to volumes . is there any solution to make this happen ? thanks
  22. I was looking into sdf and i found this file from Chris. I slightly modified it to get points colored by a ramp using sdf Does anyone know a better way to do that, in a normalized kind of way? I would like not to have to use the fit range to adjust the color ramp. Later i want to use this method to create custom velocity field on a pyro sim to contain the smoke within the velocity field. Thank you Fred sdf to point color.hip
  23. Hi guys, Currently, I am working on a project where I need a way to get a fractured geometry cloth simulation to activate each fracture piece according to the color attribute. The plan is that a curve, representing the path of another object's motion, will pass through the fractured object causing it to begin floating away and disintegrating from the point of impact/contact. I am still learning Houdini and have only been working in it consistently for about 6 months or so, but I have the effect mostly working with the disintegration and cloth simulation and such. What I can not seem to figure out is how to activate the pieces as the color envelopes the object. I have found other forums posts that have given some good routes (That's where I got the color transfer route to where it is currently at) but they are for fractured RBD objects and I have not been able to get those to work for a cloth object in DOPs. I have the color working in SOPs but just need help getting that into DOPs and controlling the activation of each piece. I have created an example file and attached it below. Thank you in advance for any help/advice you guys can provide. Thanks, Dustin P.S. As a bonus problem solve: one piece seems to get stuck on nothing, as if it is constrained to an invisible point in space, but it has no constraints. I am not sure why yet. I'm going to keep looking into the issue, but if anyone knows why please let me know. Thanks. ClothFracture_Test.hiplc
  24. Hi Guys, I have been trying to get my point's cd from a mesh with texture. I seen alot of method around that are using attribute promotes from vertex UV to points UV. However the UV I promoted are slightly off. I wonder if there's any way that I can use a vop to get closest surface texture's color info and project them to my point cd? Very much thanks and appreciate any help from you guys. I have attrached my file. texPoinntTex002.hip and the obj file (testAlembicCon.hip), just have to change the extension to.obj will do. texPointTex002.hip testAlembicCon.hip
  25. Hey everyone, I originally started this thread on the sidefx forums here, but I'm still stuck on how to proceed with this effect. My initial goal is to get particles flocking by color. Once I have that figured out, I need the particles to also flock around a goal geometry so they can take its shape. In the end I'd like to have blobs of colored particles oozing/crawling around the geometry's surface. I've done some research on flocking concepts, so I know that I need to create alignment, repulsion, and attraction forces to manipulate the particles, I'm just stumped on how to execute the concepts in Houdini. I have the cmivfx tutorial on flocking, but it looks like some of the SOPs have changed with the years... preventing me from finishing the tutorial In my previous thread I was introduced to the pop steer nodes, but they're lacking sufficient documentation/example scenes so I'm having trouble getting started with them. I think using those nodes with VEX would be the best way to do this, but I'm open to anything to get me started! Thanks! Mike color_and_shape_flocking.hiplc
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