vrayfur inqury

[Crayox13]

Since I got no replies in my old thread, I have to open a new one.

So, I'm using vrayfur for grass on my exterior scenes. I have 2 Opterons 275 (4 cores) and 4 GB of RAM.

1) what's the best memory setting for me? It's on auto setting, but should I change it from 400MB?

2) Maybe it's better to use two vrayfurs on the same emitter object, so that the emitter doesn't have to have so many subdivisions? If yes, I think vrayfur should have seed option, because this way, two emitters will generate grass leaves on the same spot - no effect.

3) Can the engine be adjusted so that it doesn't matter how many faces the emitter has? Only per face works for large areas, per area is unusably slow. So I make a plane with a lot of subdivisions and then boolean out the road and other stuff. It would be much easier to make a spline and extrude that shape, but then I don't have equal pattern of faces, so per face makes uneven grass generation. If I could use per area, this would be great.

Hope everything makes sense.

Please help, and advise

thx

[Fekta.studio]

hmm why dont u use displacement for lawns - mutch faster and not that memory hungry, or use build in hair of max, tweak and convert into mesh - then proxy it... i recommend first one... i have issue with vray fur for big terrains, and displace is the fastest, easy to set up and controll way.. hope thats help..

If u sitll wants to run through vrayfur, so u must put memory as high as possible, 400MB will be verry low....
can u post some renders how big is the terrain for grass, and your render settings.

[Crayox13]

Yes, I know about alternatives. I don't like displacement when it's close to the camera, and MAX hair loads entire mesh when you're rendering, and it's a shopping mall scene, a lot of large grass areas.
Like I said, it's ok now, I render GI with vrayfur hidden, and then the real render renders pretty fast. I'll upload my scene when I'm done. It's pretty cool now. But still I want to know the answers to those questions because on my tests, if I put memory too high, like 4000MB my hdd is working all the time which is actually slowing everything down. So I want to know the pro setting for it - the way chaos guys meant for it to be used.

thx for the advices though

[Crayox13]

Hm, how come no one wants to answer my questions? lol

[Morne]

probably because everybody is telling you how they would do it, but you still want to do it your way. Just tweak your displacment settings or use a different map. Furthermore it will help if you post some renders so we can see what you are talking about.

[Crayox13]

My questions 1, 2, and 3 are not related to a particular render but the vrayfur in general, and about vray in general. So, that's not the reason - my using that technique.

[Aldaryn]

My experience is that VrayFur is useless for larger areas of grass. Tried it many, many times. Unusable even on a 10x10m area considering a relatively realistic grass density.

I, too, recommend using displacement, and enhance it with some scattered geometry on top. Works quite fast and well.

Best regards,
A.

[Crayox13]

It works, I have a huge area. But, you must keep your per face around 100 - 150 and increase density with emitter object having more faces. I use plane with a lot of faces and then boolean the areas that are roads, pavements etc. I think this could be an interesting topic and we could improve this technique, but we also need input from Chaos guys - Vlado? In few days I'll send you the final renders. My architects are delaying some changes so I don't want to double render.