Show HN: Soft Body Jiggle Physics

A simple and fundamental standard for dynamic soft body dynamics.

embedding-shape an hour ago | parent | next [-]

Nice donut in the demo, but would love to see a human model for a more fun demo :) Ideally with a proper weight map for the different body parts too, seems well done enough that you could get really close to something realistic.

	▲	hgoel 33 minutes ago \| parent [-]
		That's probably the intent given the link in their github bio

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WizardK an hour ago | parent | prev | next [-]

Nice to see someone else doing physics in the browser. And this looks well put together, keeping the engine dependency free and separate from the renderer is a good call, that is what makes it easy to reuse in Three or Babylon.

One question: how does it hold up when the framerate changes? Spring jiggle like this usually either blows up or feels different when the timestep moves around. Are you using a fixed timestep, or just relying on the damping to keep it stable?

	▲	bruce343434 an hour ago \| parent \| next [-]
		The accumulator pattern keeps simulations stable in the face of variable frame rate. Accumulate the frame dt into an accum variable. If accum>fixed_physics_dt then step_physics until false. I'm assuming the author did something like that because it's standard practise. https://www.gafferongames.com/post/fix_your_timestep/
	▲	embedding-shape an hour ago \| parent \| prev [-]
		> when the timestep moves around Why would the physics timestep move around? Typically you keep that fixed and separate, especially not locked to the display framerate, physics get really wonky then regardless of what you do.

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Razengan 9 minutes ago | parent | prev [-]

I had vastly different expectations, though I suppose this could lead to them..