ammo.js | Direct port of the Bullet physics engine | Game Engine library

It's due to inertia. The first Newton's law says that if the forces applied on an object is zero (the case of your sphere after your gravity change), the acceleration is zero. But it does not mean that the velocity is null. In your case, the velocity will stay constant. Another way to convince you is with Newton's second law which is probably coded in ammo.js:

ma = F

a is the acceleration, m the mass, F the sum of external forces.

Let's say that a = (v_{t+1} - v_t) / dt. With F=0, you will get v_{t+1} = v_t, a constant velocity.

v is the velocity, dt the time step.

The code you posted will not do clothing as it as no collisions. The code in ammo.js will but you need to generate the clothing yourself.

Cloth is typically simulated using masses and springs

The reason why btConvexHullShape wasn't working (although the collision around it actually works) is because it isn't for concave shapes.

As for the btBvhTriangleMeshShape, I have been inputting the vertices the wrong way. I had to multiply the indices by 3 (because each vertex has 3 components).

Here's the full working code:

Like any other bounding volume, a convex hull is always closed. So I'm afraid what you are looking for is not possible.

SOLVED I used a local web server (Three.js's reference)and changed this:

The files are not available if they are not defined as an asset in the .angular-cli.json or they are located in the assets folder.

So you have two possibilities:

1. Put the files into the assets folder then your code should look like that:

So lets start with the basics. Incase you donot know about make and cmake, study it before proceeding.

First you need to build the Bullet Library from source to use it on the web. From what I can see, you need to pass in flags to build it independent of python. Study these flags and see what is required by you.

The Bullet Library is using cmake to generate the build files - so first get a makefile out of cmake and then you can “emcc make” the generated makefile.

The output of this step ie a .bc file, is to be “linked” to the output of the next step.

Now the example.cpp that you want to compile depends on some headers of the Bullet Library. So while compiling your main.cpp file you will need to pass the em++ binary the path to these headers. This once compiled should generate your main.bc

Now you need to call em++ again, but with the main.bc along with the .bc from the previous step as parameters and also provide the required output file ie js/html. In one sense we are now linking all the “.bc” files to generate js/html.

Lookout for some missing symbol “warnings” as that could mean your code wont run.

Btw all this is available on the official emscripten website, so incase of confusion you should refer it.