A plugin for TouchDesigner
Path-traced physics, live in your network.
Harlow adds a real-time GPU path tracer and a set of GPU solvers to TouchDesigner. Liquid, fire, smoke, rigid and soft bodies, fracture and weathering, all driven by ordinary POPs.
Simulate it, light it, render it. All on the GPU.
Nine operators that slot into the networks you already build. Every solver feeds the path tracer directly, with no readback to the CPU.
01 · Path Tracer TOP
Real-time path tracing
OptiX rendering with ReSTIR lighting and DLSS Ray Reconstruction. Glass with dispersion, caustics, subsurface, depth of field and motion blur. Reads your Camera and Light COMPs.
02 · Liquid + Whitewater POP
Liquids
A full FLIP solver, output as a surface mesh or particles, with spray, foam and bubbles. Liquids fill cups, wet surfaces and put out fires.
03 · Volume Solver TOP
Fire, smoke and explosions
A 3D grid solver rendered as true volumes. Candles to oil fires, colored flames and steam.
04 · Bodies POP
Rigid and soft bodies
Spheres, boxes, capsules and concave meshes, with joints, chains, dents and soft bodies. Grab them with the mouse.
05 · Fracture POP
Fracture
Voronoi cuts into closed, solid pieces, glued together until something hits hard enough.
Solvers that affect each other
The solvers couple on the GPU, and surfaces remember what happened to them.
- A liquid can douse a fire.
- Fire can char a surface that a liquid then wets.
- A body can float in water and be pushed by an explosion.
- Surfaces get wet, burn and melt, and keep the marks.
Built into the TouchDesigner workflow, not around it.
Harlow operators are POPs and TOPs. You steer them with points and attributes, light them with your own COMPs, and the result is a TOP like any other.
Wire any POP in
Feed geometry or a solver into an HRLW Geometry POP and pick a material. Attributes like materialid, Cd and v come through.
Drop in a Path Tracer
Put an HRLW Path Tracer TOP beside your Camera and Light COMPs. It finds every HRLW Geometry POP, light and camera by name.
Look at the TOP
Composite it, feed it to a projector, or keep it in your TOP chain. Info CHOPs expose counters and timings.
Swap one operator for another.
Each Harlow operator takes the place of something you know. Force POPs, Collider POPs and Attribute POPs stay exactly as they are, and drive every solver.
Full cheat sheetMade with Harlow.
Join on Patreon. Keep every build.
Harlow is released to patrons on the Harlow tier. Every build that comes out while you're subscribed is yours to keep, even after you stop.
- New builds as they're released
- Up to 3 computers
- Works offline once activated
Already a patron? Get your license key · How licensing works