Maya Grass MR
By Rodrigo Segura | October 20, 2009 | 9:04 am or 8:04 am GMT
I will post this in english since i believe is what most of the community can understand.
I have been making tests on several ways to make grass render good and fast using Mental Ray, helped me a lot tips from jeff pattons blog
as well as Alessandro Prodan´s work
and djx blog
there are a few things i want to share...
First, the three methods i have found:
1. Displacement material, with a distance based falloff to decrease render times, also rendering without displacement, freezing FG map and rerendering with displacement.
it gives a nice result, fast, but no the fastest, on close-ups looks not-so-good. good for big lawns.
2. Fur used as Grass, using Puppet´s Geometry Shaders
fairly fast, good mid range results.
3. Using paint FX converted to geometry, making a patch of grass and then using that patch with MR proxies. the patch proxy objects are painted on the surfaces using Maya´s geometryPaint.
the fastest, results depend on how much time and effort you put on making the patch.
Cons: placing the geometry can be tricky but once you get some practice is easy enough
Pros: super fast, specially if you use BSP2 that takes advantage of MR proxies, and you can render literally millions of polygons.
If you need more details just ask. I´m planning to make a tutorial, but i haven´t found the time.