Official Mesh weighting feature

We are investigating adding the ability to bias/weight the assignment of meshes to particles.
The idea being to allow you to spawn more of some meshes, and less of others.

To do this, we are adding a numerical field next to each mesh in the list, when activating the new Mesh Distribution setting in the Renderer module.

The weightings are relative to each other, so a weighting on one mesh of 3, and a weighting of 1.5 on another mesh, means there will be approximately 2x as many of the first mesh.

It will usually make sense to think of the weightings as a percentage chance, and make them add up 100, for example, but we don't need to place this restriction on how it is applied.

It also comes with a script API: ParticleSystemRenderer.SetMeshWeightings.

Grab the build from here:
https://beta.unity3d.com/download/8a88eb243a37/public_download.html

And let us know what you think here: https://forum.unity.com/threads/mesh-weighting-feedback.1088548/