Jenga – Physijs (chandlerprall.github.io)

Mozilla Firefox 27.0 works on Linux Mint.

The gravity constant (or the density of the blocks) seems to be a little low. Like playing Jenga on the moon.

You could do that in real life if you did it fast enough. It's basically the same as the classic trick with yanking a tablecloth off of a table.

It's much easier here as it looks like the gravity is quite a bit lower (alternately, the simulation is much slower than realtime) which makes the friction forces substantially weaker.

For an example of the principle in action with a real Jenga game, see: http://woodgears.ca/jenga_pistol/

Works fine for me. Slow as hell if I have integrated graphics on, but that's to be expected. Works great when on discreet.

I ran into the same bug, I think there is an easy fix. When swiping one of the blocks out, my cursor left the window. The event system missed the mouseup that happened out-of-window. So, add another handler. onMouseLeaveContext(dropBlock())

But quite unlike modern OpenGL, which does not simulate physics at all.

I just did this, it was thrilling, like ripping a table cloth out from under a table setting. I wish I could do that in regular jenga.

Yeah. I have a standard dell inspiron n5040 and using the latest Firefox on #! debian stable I topped out at round 8 fps.

It's a trick to make the simulation more stable. Stacking in physics engines is difficult. It's a careful balance between speed and stability.

If this demo took place on Earth, the Jenga blocks would have to be 1.96 meters long in order for the gravity to be realistic. Alternatively, if the Jenga blocks were the standard length of 7.5 cm, this would take place on a planet where gravity is 0.375 m/s² (less than the Moon).

If you want to see what the simulation looks like with Earth's gravity, change line 46 of examples/jenga.html (at commit e067679006a92dbbd02a81e990a69a86a5812e81) to

  scene.setGravity(new THREE.Vector3( 0, -784, 0 ));