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You can also use the measure sop in volume mode and measure by piece and then in the reverse sop you can just say @volume<0 so if there any negative values you reverse them

Thank you so much Paul <3

Awesome, thanks so much for your help!

vector p = @P; // Center control, optional p -= chv("pivot"); // Scale the cellular pattern p *= chf("scale"); // Rotation controls in degrees float rx = radians(chf("rotate_x")); float ry = radians(chf("rotate_y")); float rz = radians(chf("rotate_z")); matrix3 m = ident(); rotate(m, rx, {1, 0, 0}); rotate(m, ry, {0, 1, 0}); rotate(m, rz, {0, 0, 1}); // Rotate the cellular noise space p *= m; // Directional stretch makes the rotation visible p.x *= chf("stretch_x"); p.y *= chf("stretch_y"); p.z *= chf("stretch_z"); float f1, f2; vector pos1, pos2; vnoise( p, chf("jitter"), chi("seed"), f1, f2, pos1, pos2 ); // Border calculation float edge = f2 - f1; float border = 1.0 - smooth( chf("border_width"), chf("border_width") + chf("softness"), edge ); // Cell color value float cell = rand(pos1 + chi("seed")); // Final result float result = lerp(cell * chf("cell_brightness"), 1.0, border); @Cd = set(result, result, result); f@cell_border = border; f@cell_value = cell; f@cell_result = result;

How about compare only once prim to vertex normal for each piece. flip_reverse_prims_v02.hipnc

I really like the cellular noise node that can be used inside a point VOP, as it yields good borders compared to trying to remap worley/voronoi patterns. The downside is that it can only be used on a 2D uv map. How would one go about getting the same results with a vector 3/3D input? Similar to the 3D outputs of Unified Static, Turbulent, AA noise, etc. I've tried searching, but haven't really found anything directly addressing the issue. Thanks!

Hi; I have an asset that I imported into Houdini that has pieces with reverse Vertex Normals inside a for each loop per connected piece node, I have written a vex code that finds their bbox center of a piece and tries to determine which pieces get flipped according to the dot product of the point positions and the the bbox center point and have gotten no result out of it And this is what I could come up with for islands with volume. I have absolutely no idea as to how to handle flat plane like structures. Maybe compare their vertex normal orientations to the centroid of the entire enclosure? But then again my code doesn't do the job Any help would be appreciated. AJ flip_reverse_prims.hiplc

Hi Daniel, It's 6 years later and I've been looking into doing the same thing. Any possibility in sharing please? Thanks!

thanks this fixed my issue!

https://www.patreon.com/posts/polar-inversion-159637654 I have been experimenting with Houdini’s new Copernicus network and started porting some of my existing COP tools into custom OpenCL COP nodes. The first one is a Polar Inversion filter implemented directly as an OpenCL COP node. The core mapping is based on radial inversion around a center point: scale = radius² / distance² In practice, the important part is not the formula itself, but making it stable and usable as an image filter. The implementation uses inverse mapping, where each output pixel traces back to the corresponding source position. Near the inversion center, the denominator is clamped using a pixel-footprint floor, with an optional softness floor. This avoids the unstable singularity you would otherwise get from dividing by a near-zero distance. For sampling, the node uses deterministic subpixel supersampling and Houdini’s rectangular filtered sampling through "imageSampleRect". The filter footprint is currently based on the output pixel footprint, which gives better reconstruction than a naive point lookup while still remaining predictable and fast. This is the direction I want to take with Copernicus: converting my existing COP nodes and implementing more advanced image filters, compositing operators, and procedural transformations that are not currently available in Houdini. The goal is to build a deeper image-processing toolset inside Houdini, using the same philosophy I use in my VEX work: low-level control, practical performance, and tools designed around real production needs.

Hi everybody I hope you are having a lovely Friday so far. I don't know if this is the right channel to post questions but there is this great tutorial from Entagma on how to do a paint stroke. Great! But how would you approach if you need to add a brush interacting, like a brush doing the paint brush stroke. Would you use a vellum hair sim on the hair of the brush interacting with the viscous Flip solver simulation. Is it possible to mix vellum and flip solvers? Thanks https://www.youtube.com/watch?v=8TvAe3GxNFs&t=17s

Particles and Anticipation. Have Fun . proc09.h

Thanks for the tips! gonna check that out, thanks again for taking time to help me!

Try to adjust closer to worldscale, based on this collision padding and amount of bullet substeps. Check constraints, seems something messed up here. Also, PY position initially is under the ground what doesn't help.

Hi Here is my approach to this effect: chain.mp4 magnetos_stick_02.hip

Hey @fencer quick question, I've been trying to fix the intersections doing a bunch of stuff, adding substeps, switching convex to cilinder, and other 10 things I saw on forums, without any luck. Best result so far I had having box as collision, but it changes the behavior. Do you know what else can I try to avoid any intersections? I've also tried to rotate them to start like this: but I like the behavior that I had initially, so ended using a transform pieces post sim, with the rotation, but of course, that adds even more intersections. Attaching the file if you had any time to check it, im getting crazy trying to solve it, no worries if not, already helped me with this magnific setup! Thank you! magnet_issue.hiplc

Fencer coming to the rescue once more, thats clever! I'll have a look into this. I then could have more control with the stretch too I imagine and just up the fps for slomo in comp

What if to play with cloth, set thickness to knot size and add deformed net later. It might be more flexible and faster to work. football_net_collision_v01.hipnc

Wish I could take a closer look at this node setup. Have you ever managed to get something close?

I've been struggling to work on an effect that I'm trying to create which is basically a slowmotion ball leading into a soccer goal net in bullet time. The part I'm struggling the most with isn't the simulation aspect but the net rope shapes themself, the knots and getting the shape to then interract with objects without it fallin appart. Anybody ever build one of these type of things, something similar or know where I could learn in on it? Many thanks!

You'd have to unpack them, but this technique might work for you.

Maybe red.hipnc

How would you guys approach a shot where one point on a moving object connects to another point on a moving object? And then turns off and connects to another moving point? Imagine a laser on the back of a car firing at a point on another moving car, repeatedly hitting it at the same point.

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I’m working on a fish flock simulation in Houdini using POPs. Right now I’m using a POP Attract setup to drive the movement of points, and then I’m copying packed fish geometry onto those points. The flocking motion is working pretty well overall. The issue I’m trying to solve is making the fish bend naturally while turning. At the moment, when the attract direction changes — especially when the fish turn sharply — the packed fish geo just rotates rigidly with the velocity vector. I’d like the fish bodies to arc/bend during turns so the motion feels more organic, similar to real fish movement. Since the fish are packed geometry, I’m not sure what the best workflow is here.