Defaultish lighting not so sucky??

[percydaman]

So i was rendering out a rough test animation to send to the client for review. ie defaultish lighting, reflections but no glossies and so on. And I noticed that the default lighting didn't seem to suck so bad, so I wondered how it would look with a dirt pass, key pass and a little fudging in photoshop. Other then the Sun pass, there's no lights in the scenes casting actual shadows. Dirt pass FTW!!

Here it is. Keep in mind this is just a joke post, but thought it was kind of interesting nonetheless.

[elektrosport]

Turn off GI(is it on?) and dirtpass and you've got a formZ style architectural rendering..

It's not completely without value, _sometimes_ all the sweet little shadows and light reflections that come with the "photoreal" stuff actually blur the brain's storytelling abilities, it leaves nothing for the imagination to work with..

This is one of the main reason architects so often have "bad 3D".. It's usually not really bad though, we (architects as a species) just tend to dislike/dismiss all the fluff that makes clients (and geeks) salivate..

unfortunately I'm caught inbetween being an architect and a bit of a geek..


K.

[Infrared digital]

What is a dirt pass?

[marcoos]

yes, how do you pass the dirt?

[percydaman]

ya gotta fire up mental ray. its has a dirt pass shader you can use.

[metroberlin]

yes, we sometimes use that workflow...for rush projects..and especially for exterior where gi is often not needed.

[sunnyc1]

Or for those using 1.48 and above Vray's dirt shader works very well.

We used a similar technique for a casino animation we produced. There
were just too many lights and objects to cast real shadows so we faked
a lot of using the dirt shader. Thanks Vlado!!

SunnyC

[BBullo]

That's pretty cool.
I've been messing around with dirt since your kitchen post with the PS file.
I used it on a job where the client wants everything essentially white, and there is alot of trim detail, but with no contrasting colors in the scene its hard to punch out the small details, with just a hint of dirt in the scene it really helped enhance the rendering and punched out the trim detail.

[marcoos]

Hello,

is there a tutorial or something to show how this dirt map works, and how it is intergrated with a vray render i have got a dirt map in my diffuse slot of a mental ray mat, but if seems to have no effect on the render.
also how does one go about getting 1.48, i bought 1.47 quite recently do you have to pay extra for upgrades? it seems to have loads of good stuff that i would like to try out.

Cheers

[armilla]

Here's a good tutorial for Ambient Occlusion in Mental Ray, compliments of Tim Woods:

http://www.vanilla-box.co.uk/Tutorials/Tutorials_05.htm