When using procedural primitives renderer should supply detail size of the bounding box projected in raster space to the external program. It appears that pixie does this wrong. It supplies very huge number (~ 10^33) and it is always the same. This patch makes detail size value to be reasonable and approximately the same as aqsis and 3delight supplies when using the same RIB. Although, I am not sure that this patch will not break something else.