Bug Burst & Particle Sizes

I am using Burst

IJobParticleSystemParallelForBatch

to control particles. I am using position, velocity and age without problems, but when I want to access the particles' sizes, I get null reference exceptions. I have since noticed, that I don't get these exceptions, if I enable "3D Start Size" (which I do not want; the particles should be scaled uniformly).

Is there an alternative to make it work? I haven't found a mono-dimensional size alternative in the

ParticleSystemJobData

class.

 

For anyone finding this: if "3D Start Size" is not set, only the x-component of the sizes

ParticleSystemNativeArray3

has a value. Without looking at the source one might not realize that the

ParticleSystemNativeArray3

is struct that contains 3

NativeArray<float>

(x, y and z) and getting a single Vector out of this struct builds it from the respective entries in these arrays. In the uniformly scaled case, the y and z components are null, to save memory, thus building the vector throws a

NullReferenceException

.

This is a long winded way to say: instead of using

data.sizes

, use

data.sizes.x

.

I wish the documentation for

ParticleSystemJobData

was clearer on that. Alternatively, it would be useful, if the

ParticleSystemJobData

contained a get-only property for uniformSizes that directly returns the sizes.x array.