grainy render

[chen ray]

hi guys i tried render the attached model and have 100 passes but it still look grainy especially the under side like the attached image. i notice only white area under shade have this problem.

 

wonder any kind soul can advise how to solve this?

 

nxt is a cool render that give soft render which is great but unlike the previous ar 4 and 3 , the render are sharper.

 

have being using accurender for ten years and now slowly switching to nxt. great product..

 

 

[Peter Milner]

Shadow areas need longer to resolve.

100 passes is not very much.

[Chas / Aug Posekany]

I've found when pressed for output I use the original particle tracer engine. I can stop the rendering if necessary and usually have something I can use. The path tracer does have very good output but requires a lot more horsepower and time to resolve a good image. My puny PC here at work struggles to get any decent output (32 bit).

My home PC with dual quads and 64 bit perform with the path tracer just fine.

[Roy Hirshkowitz]

Here it is-- using the Exterior lighting preset-- 500 x 500 x almost 1000 passes using the Path Tracer.  I let it go for about 1/2 hour.  2500 x 2500 resolution will take 25 times longer(!)  Try to use the lowest resolution possible. Exterior indirect lighting (what this one was set for) can often take as long as Path Tracing.  Try to use the lighting presets when possible.

 

 

[chen ray]

hi roy thank for ur reply. but most often my clients expect very high res of min 4000 x 4000 which my computer can more or less handles ( sometime i render at 3000 x 3000 and increase resolution in photoshop. but to wait for 1000 passes for more complicated models seem abit difficlut for me as it will take very long in days ???.

 

any chance if future version of nxt can reduce the grainyness and make it sharper just like the old ar 3 and 4 ?

 

 

[Roy Hirshkowitz]

No-- not with the Path Tracer or with exterior indirect lighting in the Packet Tracer.  

The reason ar3 or ar4 could produce sharper images is because they didn't calculate these paths-- they were estimated with an ambient term which is very smooth but often very wrong.  If you turn off exterior indirect lighting and use the Packet Tracer engine you will get something closer to previous versions.  The undersides of the balconies won't look very good, though.

[chen ray]

hi roy sorry what is a packet tracer and where can i find it in the nxt interface ?

 

 

[Alejandro Testa]

Packet tracer is the original render engine. Path tracer is the one you have to select in lighting > advanced