All Activity

What is SkyFloor? It’s a specialized HDA designed for Solaris (LOPs) that creates a fully synchronized HDRI lighting setup and a procedural floor (with puddles, wetness, or studio cyclorama modes) in seconds. Key Features in Version 1.5.3 Integrated Polyhaven Browser: Deep integration with Polyhaven. Browse thousands of HDRIs, models, and textures directly within the HDA. Auto-Connect Pipeline: A smart logic that automatically manages your stage hierarchy. Independent HDRI Multipliers: New Diffuse and Specular multipliers for fine-tuned lighting control without affecting your backplate. Smart MaterialX Engine: Automated creation of MaterialX/USD materials with proper Color Space management (ACEScg/Linear) for Karma Magic Match & Auto-Horizon: One-button tools to analyze your HDRI and perfectly align the floor perspective and exposure. AMD MaterialX integrated Avalaible on Gumroad. https://hipfreak.gumroad.com/l/dnrpln [hipfreak.gumroad.com] Hope you enjoy. NAim

No need to do it in each frame, before tarnsform main body add points to rotation center of each rotor. Than apply transform to body, in rotor rotation transform refer pivot point to points you add before.

it's a long animation, I can't place it manually for every frame, and the body is moving. it is symmetric 3.3313 x 3.33132

You need to place it manualy, you object not symmetric

Although I have changed the pivot it still has that jitter

you need to check pivot point position. looks like it not in the rotation center

The body in grey is moving. The main rotor in orange and tail rotor in red are rotating based on $CEX $CEY $CEZ, and are supposed to follow the motion of the body, but it's jittery and keeps moving from it's place. Am i doing it wrong? is it doable with transform or do I have to use APEX for this kind of animations? main Rotor animation transform tail transform node

@Librarian I wanted to express the natural falling of half a drop from a large, plopping drop. The @border attribute was just for trial and error to separate things. It has no special meaning... Test 1: I added horizontal noise to only @border inside the DOP. Test 2: I multiplied vertical v on only @border to make it accelerate original force node.

Just One question?? To you.. so that you can Answer your question Also. In your File, @border attribute , Please explain Usage of that attribute, purpose ??? Thanx

@Librarian Thank you. When I copied it exactly, it worked ！ However, it's difficult to understand. Could you explain the core concept behind how this separation is achieved? I couldn't figure it out just by looking at the VOP, so I'd appreciate any hints on the underlying concept.

Just add This trick if you mean this effect @Dand, I Just add those nodes and Solver ..didn't change anything ,Have Fun

Hi everyone, I'm trying to create a FLIP simulation where a fluid source is split into two parts: a blue top and a red bottom. My goal is to have them physically separate, with the red part falling away from the blue part. However, the fluid stays connected and won't split. Blue source: force attribute set to (0, 0.1, 0) Red source: force attribute set to (0, -9.8, 0) Even with these opposing forces, the drops remain stuck together. How can I achieve physical separation between these two colored regions within the same FLIP solver? I tried various values for surface tension and viscosity. I've attached my HIP file for reference. Thank you! drop_separation.hiplc

In Solaris, I’m using RenderMan Lama shader displacement via Material Library. Displacement is evaluated at render time and renders correctly. When scattering rocks with Asset Instancer, instancing happens on the pre-displaced SOP geometry, so once shader displacement is applied the instances float or intersect the surface. Questions: Can Asset Instancer evaluate or reference render-time shader displacement? Is there any supported way to procedurally link Material Library displacement parameters to instancing so lookdev changes stay aligned? Or is SOP-level proxy displacement / ray projection the expected production workflow? I’m aware render-time displacement isn’t available at SOP level; mainly looking to confirm best practice, not hacks. Houdini 19.5/20.x

Guys! a huge bow down to you, I need time to digest your ideas

Here is an approach combining resample nodes with sweep, noise and polycut. The VEXpression offsets the noise for each line. morse.hip

Yes I think, maybe I just need some density controlling algorithms or short way to just control density. Maybe I am overcomplicating things. Thank guy for info. Going to check this out

You can also use the clip node (clip attribute). The attribute can be generated by some random function (combined sin, cos, ...). You can clip your curve into two complement sets. One of these parts can be resampled for the dots and the other for the lines (ribbons). Here is a file with some ideas. clip_carve_lines_dots.hipnc

@Librarian hey Thanks! Can you walk me through this, what’s the main steps, and do I also need Python?

// DETAIL WRANGLE (run once) // Input 0: a single curve/polyline primitive (uses "prim" parm) // -------------------- Parameters -------------------- int prim = chi("prim"); int seed = chi("seed"); string msg = chs("message"); float unit_len = chf("unit_len"); // unit length in curve-u (0..1) float spacing_units = chf("spacing_units"); // base dot spacing in "units" float dot_mult = chf("dot_mult"); // density multiplier for dot float dash_mult = chf("dash_mult"); // density multiplier for dash (dense dots) float jitter_radius = chf("jitter_radius"); // world-space jitter radius around curve float jitter_along = chf("jitter_along"); // along-interval jitter (0..1) int max_pts = chi("max_pts"); // Morse timing (in units) float dot_units = chf("dot_units"); // usually 1 float dash_units = chf("dash_units"); // usually 3 float gap_symbol_units = chf("gap_symbol_units"); // usually 1 (between . and - in same letter) float gap_letter_units = chf("gap_letter_units"); // usually 3 (between letters) float gap_word_units = chf("gap_word_units"); // usually 7 (between words) // -------------------- Helpers -------------------- function void frame_on_curve(int geoh; int pr; float u; vector up; export vector P; export vector T; export vector N; export vector B) { P = primuv(geoh, "P", pr, set(u, 0, 0)); float du = 1e-4; vector P2 = primuv(geoh, "P", pr, set(clamp(u + du, 0.0, 1.0), 0, 0)); T = normalize(P2 - P); vector a = normalize(cross(up, T)); if (length(a) < 1e-6) a = normalize(cross({1,0,0}, T)); B = normalize(a); N = normalize(cross(T, B)); } function int emit_interval(int geoh; int pr; float u0; float u1; float density_mult; int seedbase; float unit_len; float spacing_units; float jitter_radius; float jitter_along; int max_pts) { float du = max(0.0, u1 - u0); float interval_units = du / max(1e-8, unit_len); float base_count = interval_units / max(1e-8, spacing_units); int npts = int(ceil(base_count * max(0.0, density_mult))); if (npts <= 0) return 0; vector up = {0,1,0}; int created = 0; for (int i = 0; i < npts; i++) { if (created >= max_pts) break; float t = (npts <= 1) ? 0.5 : (float(i) / float(npts - 1)); float r = rand(set(seedbase, i, 19.123)); float u = lerp(u0, u1, t); // jitter a bit along the interval u += (r - 0.5) * jitter_along * (spacing_units * unit_len); u = clamp(u, u0, u1); vector P, T, N, B; frame_on_curve(geoh, pr, u, up, P, T, N, B); // jitter in disk around curve float ang = rand(set(seedbase, i, 3.7)) * 2.0 * M_PI; float rr = sqrt(rand(set(seedbase, i, 8.1))) * jitter_radius; vector jitter = cos(ang) * N * rr + sin(ang) * B * rr; int pt = addpoint(0, P + jitter); setpointattrib(0, "curveu", pt, u, "set"); setpointattrib(0, "pscale", pt, fit01(rand(set(seedbase, i, 77.7)), 0.6, 1.2), "set"); created++; } return created; } // Morse lookup: chars and their morse strings function string morse_of(string ch) { string chars[] = { "A","B","C","D","E","F","G","H","I","J", "K","L","M","N","O","P","Q","R","S","T", "U","V","W","X","Y","Z", "0","1","2","3","4","5","6","7","8","9" }; string codes[] = { ".-","-...","-.-.","-..",".","..-.","--.","....","..",".---", "-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-", "..-","...-",".--","-..-","-.--","--..", "-----",".----","..---","...--","....-",".....","-....","--...","---..","----." }; // already uppercase before calling, but safe: string up = toupper(ch); int idx = -1; for (int i = 0; i < len(chars); i++) { if (up == chars[i]) { idx = i; break; } } if (idx < 0) return ""; // unsupported char -> treat as gap return codes[idx]; } // -------------------- Main: walk along curve-u -------------------- float u = 0.0; int total = 0; msg = toupper(msg); // iterate message characters for (int c = 0; c < len(msg); c++) { if (u >= 1.0 || total >= max_pts) break; string ch = msg[c]; // Word gap if (ch == " ") { u = min(1.0, u + gap_word_units * unit_len); continue; } string code = morse_of(ch); // Unsupported char: treat like a word-ish gap if (code == "") { u = min(1.0, u + gap_letter_units * unit_len); continue; } // For each symbol in morse code for (int s = 0; s < len(code); s++) { if (u >= 1.0 || total >= max_pts) break; string sym = code[s]; float dur_units = (sym == ".") ? dot_units : dash_units; float dens = (sym == ".") ? dot_mult : dash_mult; float u1 = min(1.0, u + dur_units * unit_len); total += emit_interval(0, prim, u, u1, dens, seed + total * 31, unit_len, spacing_units, jitter_radius, jitter_along, max_pts); u = u1; // symbol gap (but not after last symbol) if (s < len(code) - 1) u = min(1.0, u + gap_symbol_units * unit_len); } // letter gap after each character (but not if next is space) if (c < len(msg) - 1 && msg[c+1] != " ") u = min(1.0, u + gap_letter_units * unit_len); } multiple Lines // DETAIL WRANGLE (run once) // Input 0: multiple polyline primitives int seed = chi("seed"); string msg = chs("message"); float unit_len = chf("unit_len"); float spacing_units = chf("spacing_units"); float dot_mult = chf("dot_mult"); float dash_mult = chf("dash_mult"); float jitter_radius = chf("jitter_radius"); float jitter_along = chf("jitter_along"); int max_pts_total = chi("max_pts_total"); // Morse timing (units) float dot_units = chf("dot_units"); float dash_units = chf("dash_units"); float gap_symbol_units = chf("gap_symbol_units"); float gap_letter_units = chf("gap_letter_units"); float gap_word_units = chf("gap_word_units"); // ---------- Helpers ---------- function void frame_on_curve(int geoh; int pr; float u; vector up; export vector P; export vector T; export vector N; export vector B) { P = primuv(geoh, "P", pr, set(u, 0, 0)); float du = 1e-4; vector P2 = primuv(geoh, "P", pr, set(clamp(u + du, 0.0, 1.0), 0, 0)); T = normalize(P2 - P); vector a = normalize(cross(up, T)); if (length(a) < 1e-6) a = normalize(cross({1,0,0}, T)); B = normalize(a); N = normalize(cross(T, B)); } function int emit_interval(int geoh; int pr; float u0; float u1; float density_mult; int seedbase; float unit_len; float spacing_units; float jitter_radius; float jitter_along; int max_pts_cap; int prim_id; int symbol_id) { float du = max(0.0, u1 - u0); float interval_units = du / max(1e-8, unit_len); float base_count = interval_units / max(1e-8, spacing_units); int npts = int(ceil(base_count * max(0.0, density_mult))); if (npts <= 0) return 0; vector up = {0,1,0}; int created = 0; for (int i = 0; i < npts; i++) { if (created >= max_pts_cap) break; float t = (npts <= 1) ? 0.5 : (float(i) / float(npts - 1)); float r = rand(set(seedbase, i, 19.123)); float u = lerp(u0, u1, t); u += (r - 0.5) * jitter_along * (spacing_units * unit_len); u = clamp(u, u0, u1); vector P, T, N, B; frame_on_curve(geoh, pr, u, up, P, T, N, B); float ang = rand(set(seedbase, i, 3.7)) * 2.0 * M_PI; float rr = sqrt(rand(set(seedbase, i, 8.1))) * jitter_radius; vector jitter = cos(ang) * N * rr + sin(ang) * B * rr; int pt = addpoint(0, P + jitter); setpointattrib(0, "curveu", pt, u, "set"); setpointattrib(0, "pscale", pt, fit01(rand(set(seedbase, i, 77.7)), 0.6, 1.2), "set"); // super useful for shading / grouping setpointattrib(0, "sourceprim", pt, prim_id, "set"); // which input curve setpointattrib(0, "symbol", pt, symbol_id, "set"); // 0=dot, 1=dash created++; } return created; } function string morse_of(string ch) { string chars[] = { "A","B","C","D","E","F","G","H","I","J", "K","L","M","N","O","P","Q","R","S","T", "U","V","W","X","Y","Z", "0","1","2","3","4","5","6","7","8","9" }; string codes[] = { ".-","-...","-.-.","-..",".","..-.","--.","....","..",".---", "-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-", "..-","...-",".--","-..-","-.--","--..", "-----",".----","..---","...--","....-",".....","-....","--...","---..","----." }; string upc = toupper(ch); for (int i = 0; i < len(chars); i++) if (upc == chars[i]) return codes[i]; return ""; } // ---------- Main ---------- msg = toupper(msg); int npr = nprimitives(0); int total_pts = 0; // You can choose: same message for every curve, or offset/seed per curve. for (int pr = 0; pr < npr; pr++) { if (total_pts >= max_pts_total) break; float u = 0.0; // per-primitive seed so each curve has a unique pattern jitter int sseed = seed + pr * 10007; for (int c = 0; c < len(msg); c++) { if (u >= 1.0 || total_pts >= max_pts_total) break; string ch = msg[c]; if (ch == " ") { u = min(1.0, u + gap_word_units * unit_len); continue; } string code = morse_of(ch); if (code == "") { u = min(1.0, u + gap_letter_units * unit_len); continue; } for (int k = 0; k < len(code); k++) { if (u >= 1.0 || total_pts >= max_pts_total) break; string sym = code[k]; float dur = (sym == ".") ? dot_units : dash_units; float den = (sym == ".") ? dot_mult : dash_mult; int sid = (sym == ".") ? 0 : 1; float u1 = min(1.0, u + dur * unit_len); // cap per-interval emission so one curve can't explode points int cap_here = max(1, (max_pts_total - total_pts)); int made = emit_interval(0, pr, u, u1, den, sseed + total_pts * 31, unit_len, spacing_units, jitter_radius, jitter_along, cap_here, pr, sid); total_pts += made; u = u1; if (k < len(code) - 1) u = min(1.0, u + gap_symbol_units * unit_len); } if (c < len(msg) - 1 && msg[c+1] != " ") u = min(1.0, u + gap_letter_units * unit_len); } }

Try to modify something.

Please help me, how should I approach this geo effect? Let’s take a single line as a base geometry. From this line, generate a new geometry composed entirely of dots. The dot pattern is inspired by fake Morse code: it follows the visual logic of Morse, but only consists of dots with different density. Only dots are used - no dashes. What would normally be a dash is represented as a region of higher dot density (clusters of tightly packed points). Pauses or separations are represented by lower-density or empty gaps - something like that. Any ideas?

@Kevin Gillen

Just bought a new windows machine with dual Nvidia graphic cards. Tries rendering Karma GPU for the first time and it keeps crashing my machine. I heard this is a know issue and that there is a setting that can fix it. Any help would be great. Thanks

use trick's on Your setup @caskal

Hi magicians, How can I create something like this? (ref attached). Idea is to be somehow realistic, but also art directable, I'm struggling to have some nice dripping, mostly vertical, falling within a FLIP sim. So far I've played with surface tension, stick colision, viscosity, different emitters, and some custom forces, but still looks pretty messy. Any thoughts? Thanks!