Blur-Function

[simonbethke]

This change adds a blur-function that at the same time drops splats that fall below 0.01 opacity.

This might be useful to create lower LOD splats.

splat-transform flower.ply -b 0.01 flower_out.ply

This blur caused a size difference from 10mb to 4mb

Note that 0.01 is the absolute blur radius. So if your scene is tiny you want small values. If the scene is huge you want larger values

[simonbethke]

Blur Radius	File Size
0	8,189 KB
0.001	7,606 KB
0.002	7,173 KB
0.004	6,172 KB
0.008	4,004 KB
0.016	1,545 KB
0.032	333 KB

https://drive.google.com/file/d/1cm9Nza4wGGzdoC4A5UeKYv-96Q6R8-77/view?usp=sharing