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rasterise attributes points volume from points

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Hi ! trying to set up a source for smoke sim. i use volume rasterize attributes and get strange results. 

please see what's happening

i have a bunch of points distributed across the space. its bound box is rather big (arounb 80x80x80 units)

allpts.png.33a00910de72699a45f61fa164d60129.png

then i use volume rasterize attributes and get this :

 allvol.png.5a479a2c466dde01039b4f01d2e476a6.png

as you can see it is very jaggy. of course i've played with pscale or voxelsize/sampling...but i have not managed to get smooth volume

then i deleted lot of points and left only one group of them:

group.png.52d52c6a8104eb190b47607d727c368c.png 

the same SOP (volume rasterize points) with the same settings gave me different result (nice and smooth volume)

groupvol.png.6b969976118e93dba535716e7c625a71.png 

and the question is - why i got different results keeping the same settings both for points and "volume rasterize attributes" SOP ?

the same pscale and the same voxelsize

comp.png.ee00786a11f08f046d2ad93ff08aefd2.png

the only thing that changes is bounding box of my points...

and of course it affects the simulation... i also get ugly jagged volume inside DOP....

i can not understand what is wrong....i thought it is just viewport optimization or something like that....but the simulation also goes wrong and i see this voxels in rendered picture as well.....

how can i get smooth volume for all of my points ? 

thanks in advance

 

 

 

 

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Uhm ! sorry guys!

although it looks ugly in viewport - it renders normal....it seems that it is really only viewport representation

i dunno what kind of bug was it on my first render

 

 

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