rolling Ball in Grass meadow

[noon]

Can you rotate a selection of grass with Grass-O-Matic ?

[DerLandvogt]

.....one Object for the track and an other for the meadow. I Can animate the wind strengh and an roll up. But that would work for the whole Object at the same time.

So thats not, what I´m looking for.

[noon]

does the "mesher" compound object work with Grass-O-Matic ?
If it's the case, then you can use any modifier on the mesher object. Then you can try to rotate the grass you need.

[Martijn Wijmer]

Not really an answer to your question regarding Grass-o-matic, but the animation you want to make, can be easily achieved with P.Watjes free hair-plug-in. Your strands of grass are created using particles, and with the right deflector you can easily let them interact with the footprints or ball. You could use hair for these areas, and use grass-o-matic for the overall scene. It's really worth a try.

[Martijn Wijmer]

If you're willing to give it a try, you can download it here (http://www.max3dstuff.com/max4/hair/hair.zip)

[Martijn Wijmer]

Quick set-up with Hair

[DerLandvogt]

THANKS A LOT!

I will try out and report :o)

Yours
Hilmar DerLandvogt

[DerLandvogt]

HI
I tried to use this plugin......do you know if I can use a shape of the blade of grass as an particleshape???

The normal hairform/spline doesn´t fit.
in Grass-o-matic I can taper the spline, so if I would use both plugins in the same scene they wouldn´t look like the same grass.

Thanks a lot
Hilmar

[Martijn Wijmer]

No, there isn't a way to deform the particle shape. (only the max. and min. lenght) You can, however, use a facing particle (Render info) and make a opacity map which looks like the one you use on the grass-o-matic (Haven't worked with grass-o-matic, so i don't know if it uses opacity-maps) Don't forget to enable Generate W Mapping. (I haven't used facing in hair yet, so i don't know how it will work with deflectors)

[Martijn Wijmer]

Ok, just tried to apply a opacity map (simple gradient) with facing particles, but Max doesn't seem to like that a lot. Very large rendertimes.

[DerLandvogt]

HI
no I didn´t use a opacity map with Grass-o-matic.

On this picture (taken from a turtorial hostetd at www.3dtotal.com) you can see how the grass should look like.
Thanks
Hilmar DerLandvogt



Sorry can´t attach the image.
please look at
http://www.3dm-mc.com/tutorials/grass/

[Martijn Wijmer]

Yeah, i saw that tut. You need to tweak hair, so it will look that way. I'm sure it can be done, use 2 or 3 different hair-particles, use different materials, use different lenght. Also use different wind-bindings on the hair-particles so they will bend differently. But you have to tweak it yourself. It's not like you click a button and you're done. You have to go the extra mile yourself.

[DerLandvogt]

OK I will try

THANKS A LOT!

Hilmar DerLandvorgt

[aydinu]

Why not use the FFD deformers?
Convert your grass to a mesh and then select the area you want to deform and animate it with a FFD deformer

Aydin

[Martijn Wijmer]

FFD is very time-consuming whereas Hair (if correctly set up) is computer generated, and propably more accurate. If you make a snapshot of the grass, which is problably animated, it will stop swaying and you'll see that in your render. So not using a FFD or animating by hand in general has a few advantages.

[DerLandvogt]

That was one of my first ideas too....but

if you use Grass-o-matic you have the ability to animate the wind too. If I would use an FFDdeformer the blades who should lay down on the ground, keep on moving in the wind.

Thanks a lot
Hilmar DerLandvogt

[DerLandvogt]

Hi Martijn

Well I tried to solve my question with the hair plugin....but..could you give me tip how to use the sphere as an deflector?
I created a sphere an an SDeflector...linked the Sdeflector to the ball an the emitter to the SDeflector (linkspacewarp)
but that dosn´t do anithing.

Thanks for helping
Hilmar DerLandvogt

[Martijn Wijmer]

I created a sphere an an SDeflector...linked the Sdeflector to the ball an the emitter to the SDeflector (linkspacewarp)

All good, the only thing i forgot to mention is that Hair needs a incredible high bounce-parameter. (Don't ask me why) It's kinda late right now, but i'll try to post an example-file tomorrow.

[DerLandvogt]

Thank you!

Hilmar DerLandvogt

[Martijn Wijmer]

All right, here's a example file (just very rough set-up) Download here (http://members1.chello.nl/~mj.wijmer01/Hair.zip) Only thing that borders me, is that i can't seem to find a parameter that controls the speed of the grass to stay down/curl back after the ball rolled over it. I'll try to fix it, and let you know how. (anyone else has an idea?)

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