How to control point size in archived rendering

[likforce]

Hi, everyone

I have tried a particle render using 3delight with houdini, i created attribute called "width", everything goes find and i can control the point size using this attribute.

However when i converted this particle to a rib archive file, every points become constant size.

In the archived rib file, it wrote sth like this for every particle :

TransformBegin

Translate 1 1 1

Sphere 0.05 -0.05 0.05 360

"width" [ 0.2 0.2 0.2 0.2 ]

TransformEnd

It seems different from direct render the particle. Is i did sth wrong or any other method due with this problem ??

Thanks a lot

Lik