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Until now there have been two ways to represent the particle position: unsigned 16 bit integers and 32 bit floats. The floats were originally there to allow simulations with more precision, however, they have added a lot of complexity and confusion to the code. The 3 x uint16 positions were originally intended to represent a voxel position so the particle position does not have to be converted to a voxel position every step (note that uint16 is almost the largest type that is suitable for this because the voxel position and type have to be hashed into a 64 bit integer). However, to keep things simple we're going to move to unsigned 32 bit integers. The ability to omit voxel position computation and particle distance computation (by using voxel groups instead of square roots) can still be maintained by setting each voxel to contain only one particle position. Voxels can also contain more particle positions to increase precision.

Benchmarking should support the following features:

• Integrate into the computation engine for live benchmarking
• Keep old benchmarks in the repository to measure progress
• Run with dart2js and d8 for realistic JavaScript benchmarks

Run-time information such as buffer resizes and particle allocation should be logged (selectively).

It is possible to run some parts of the simulation in parallel on the GPU using WebGL (great talk on this subject: https://vimeo.com/97329154).

Although float32 is the underlying type to store exact particle coordinates and uint16 is the underlying type to store voxel positions. It is more straightforward if all functions that are specialized to handle a specific type are named using this point/voxel distinction. Example: Domain.containsPoint and Domain.containsVoxel instead of Domain.containsFloat and Domain.containsUint16. The BromiumData.useIntegers boolean and related namings should be converted to useUint16.

There are many possible exceptions (especially in the fixed data buffer). Therefore there should be a special BromiumException for exception handling within bromium.