Uniform does not work well for random face samples with blendshapes

[patrikhuber]

The "Random face sample" uses a uniform distribution [0, n] (where 'n' is the value entered as "exp sdev").
This does not work very well as the spareness is missing.

[patrikhuber]

Note: We do use a normal distribution for the shape, colour and expression-PCA coefficients. It's just if there is an expression blendshapes model, we use a uniform distribution.