Cycles Point Density Texture: Control Radius by Attribute

Currently the point density texture in Cycles only supports a set of points with the same radius while the colour can be controlled via particle and vertex attributes.

It would be very helpful if the radius of the points could also be controlled via those attributes, making the current radius slider a multiplier for the attribute.

To avoid an infinite search space, only certain attributes should be selectable as radius multiplier:

Constant - Use the same size for all points Particle Size Particle Age Particle Speed (since it is capped at 1.0 at the moment) Vertex Weight Vertex Colour (converted to greyscale)

Mockup: pasteall.org/pic/show.php