>Trevor G Quayle  on date 11/09/2009 17:04 wrote:
> OK, a couple final observations:
> 
> If you do want to use the iso rather than a heightfield, I noticed that your
> isosurface is clipped too high and intersects with the floor, this will get
> noticeable when the light fading is working properly.  Change your contained_by
> box (This is likely also increasing your render time unecessarily)
>    contained_by {box {<-10,-3,-10>, < 25, 1, 25>}}
> 
> 
> If you are not happy with the way the lightfading is working switch to media,
> with scattering only it doesn't add much render time: (be sure to add "hollow"
> to your isosurface or heightfield object for it to work)
> 
> #declare WCol=rgb <0.217,0.552,0.877>;
> #local FD=3;
> #declare i_water =interior {
>     ior 1.33
>       media{
>         absorption rgb 1-WCol
>         density{rgb -ln(0.58)/FD}
>       }
> }
> 
> 
> I did some very quick time comparisons for you:
> 
> 1) Original iso with fading: 56s
> 2) Corrected iso (as above) with fading: 40s  (big increase! doesn't have to
> calculate back intersections anymore
> 3) Corrected iso with media: 42s (only slight increase)
> 4) HF (600x600) with fading: 28s  (another big decrease!)
> 5) HF (600x600) with media: 30s  (again, only slight increase)
> 
> Also note that changin the resoltuion of the HF only increases parse time (and
> memory usage) not render time.
> 
> Hope this has all been of some help to you.
> 
> -tgq
> 
> 
> 
> 
> 

Trevor, thank you sincerely for all your work: you probably spent a lot 
of time!
Now I'm beginning to test your suggestion in a more simple scene. I will 
post the results.
Thank you again,
   ;-)
Paolo

Post a reply to this message