Making a trailing blur on a monorail train

[AVATAREA]

OK, this is a fantasy rendering of a building design by my clients.
Im happy with most of it as is the client, except for 2 issues.

1/ I cannot work out what is causing the speckles in the darker areas on the other sides of the lake from the core building.

2/ I have tried everything and read everything I could find on moblur but I cant see how to get a blur trail at the rear of the train, the screen right of it since the train is travelling counter clockwise.
youll see that it does have some blur but this is about as far as I can make it stretch. Anyone know of a good walk through the moblur setup ? Im doing something wrong Im sure.

Max 9 Vray1.5 sp5 BOXX quad core



Thanks for any help you guys can give

[joconnell]

Ghost trails is a really handy and cheap plugin for that type of thing. If you're animating your train along a path then it might be worth making a trail object from a simple box shape, putting a gradient map in the opacity slot so it fades out over it's length and then use an animated path deform modifier so it follows along behind your train and bends appropriately.

[joconnell]

Also if it's a static camera then just up your motion blur duration higher than 1 second? If you're using the motion blur in the render dialog then try putting the motion blur duration to 5 or 10, or if it's the physical camera set your shutter speed to longer values than 1 second.

[AVATAREA]

Thanks for your reply Jo much appreciated I'm testing now Still cant get rid of the grain in the reflections in the shadows

[AVATAREA]

I got it to work thanks Jo. It was the shutter speed that made all the difference But still cant get rid of the grain in the shadowy parts of reflections

[joconnell]

That's a tough one - vray will often cut off it's sampling when things get quite dark - try playing with the noise threshold number in the dmc sampler at the top of the settings tab. Smaller numbers mean you want more accuracy in your render which will mean more sampling and slower renders. It's 0.01 by default, try going down to 0.005 and see if that helps, the other thing to do is try using render elements to see where the noise actually is - total lighting, global illumination and reflections are good ones to start with, so you can see if it's your direct light, gi light or reflections causing the issue.

[Dariusz Makowski (Dadal)]

Render brighter > save to 32 bit and down it down in post...