rendering rain effects

[David Whiting]

Here's a post of something I'm working on. I'll be interested in your comments.

http://www.cgarchitect.com/forum/fil...030428-800.jpg

I'm interested in rendering atmosphere's that are an alternative to the preponderance of renderings that appear to be done in bright sunlight between 1030 in the morning and 1400 in the afternoon.

In this study, I want to show the effects of sunlight breaking through after an afternoon summer rain. The buildings that are illustrated are existing. My initial sense is that the sun needs to be at a lower angle and the sky darker and more dramatic. I have to add some vehicles, people and street furniture. I have just started getting the 'sparkle' on the road and walks but now need to work on the trees and entourage that will be added. The upper glass windows need evidence of droplets etc

The rendering was done with viz/brazil using a single directional blight and skylight enabled as well a fog effect. The only brazil materials are the translucent awnings (wax shader) and the glass windows.

Comments and suggestions to help achieve the effect I'm after would be appreciated. My big problem right now is finding the rear-end of a vehicle that renders well up close (in the shadowed area).

Thanks

David

[ferox canis]

I have just started getting the 'sparkle' on the road and walks

the anisotropic reflection on the surface of the road and walks could be considered. otherwise it will seem too 'pure' as a wet surface.

there is an online article/tutorial re reflections in wet road surfaces (anisotropy) etc
i don't remember the link.....

[ad hominem]

I think painting a reflection mask would help. Concentrate on showing more differentiation between wet tarmac, puddles, and dry/almost dry tarmac. thinking about falls in the road, traffic paths, etc. A lot of study of wet roads would need to be undertaken to be successful here.

picture

[Alex Antuna]

Hi! nice start...Well here are some suggestions. On the road its too perfect..Usually on roads the parts where cars drive on the road it is worn away from traffic..also most roads are not perfectly flat...they have imperfections in them..more water will gather near the curbs sometimes and some times you get puddles since the roads are not all perfect..(not sure how detailed your going for thou)..Another thing is that your brick looks dry...Most times you can see that the brick will get darker since the brick is now holding some water in it...but yeah..some water stains will help...Well those are just some suggestions

[David Whiting]

thanks for the comments

I'll work on getting more variation on the effects on the road and try some approaches to getting other materials to show evidence of being 'wet' and post another try later

....off to learn yet more new stuff!!

David

[Diego Rosales]

Hi David,

I think you should definitely take a look at this.

http://www.neilblevins.com/cg_educat.../aniso_ref.htm

It's a very interesting Neil Blevins' article about anisotropy and reflections. It also deals with wet surfaces (i.e. the visual effect of rain falling over asphalt).
Hope this helps!

/Diego

[Sawyer Fischer]

Diego,

Thank you for that article, very helpful. :ebigrazz:

[David Whiting]

Thanks Diego

Blevin's thoughts are 'on the button' and will be a big help

David

[ferox canis]

thanks diego, that was the missing link....