Inception & WebGL build

Decided to use the Extra Credits Game Jam 2019 to learn Unity DOTS and Unity.Physics (their new physics library).  The Jam's theme "Connect" immediately suggested something Katamari Damarcy, World of Goo or similar to me but actual design is not set in stone yet.

I have all day Saturday and Sunday plus a few hours Friday morning and night to work on my entry so I'll allow a day or so for mostly learning and deciding what I might be able to make then a day on finishing that.  If I come out the end with an incomplete non-game but better appreciation of DOTS and Unity.Physics, I'll be more than satisfied.

I'd downloaded the latest Unity 2019.1.4 and the ECS Samples project so spent my couple of hours Friday skimming the samples, browsing the source, reading the documentation and found a CharacterController sample that's a neat base.  I figure I'll need it to run in the desktop and browser so tried builds.  Desktop worked fine.  WebGL build is really slow and, once done, failed to start with a memory error.  Turns out the sample project set webGL.memorySize to 256m but Unity now uses WebAssembly and it has a different memory parameter that's not exposed in the Editor?! 

WRONG: Editing the ProjectSettings.asset turned out not to be too hard:

<del>  webGLEmscriptenArgs: -s WASM_MEM_MAX=512MB</del>

UPDATE: OK so I've edited above to show which part was wrong.  Turns out one must create an Editor script with the memory parameter in.  Thanks to that link, here's what I used successfully...ish (see below):

#if UNITY_EDITOR
namespace UGS {
    [UnityEditor.InitializeOnLoad]
    public static class WasmMemConfig {
        static WasmMemConfig() {
            var maxHeapSize = 256*1024*1024;
            UnityEditor.PlayerSettings.WebGL.emscriptenArgs = string.Format("-s WASM_MEM_MAX={0} -s ALLOW_MEMORY_GROWTH=1", maxHeapSize);
        }
    }
}
#endif

Once done, however, it seems Unity.Physics doesn't actually work properly in WebGL build (at least with Firefox).  I don't think I have time to investigate this but I've recorded videos and ought to log this as a bug after the jam.  Here's it working in Editor and failing in Firefox:

EDIT 2: Rebuilt as a "development build" and check out the browser console only to find a rather obvious error spamming every frame:

NotImplementedException: The method or operation is not implemented.
  at Unity.Physics.JacobianHeader.Solve (Unity.Physics.MotionVelocity& velocityA, Unity.Physics.MotionVelocity& velocityB, Unity.Physics.Solver+StepInput stepInput, Unity.Collections.BlockStream+Writer& collisionEventsWriter, Unity.Collections.BlockStream+Writer& triggerEventsWriter) [0x00000] in <00000000000000000000000000000000>:0 
 
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I'd hazard that some level of stripping has removed some rather vital functionality.  With time we could figure out how to force retention of the Unity.Physics code and hopefully it'd fix the problem.  Maybe when I have more time :)

For now, I've already burnt 4 hours on this.  Guess my entry will be download-only!

Onwards, to the Learning!

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