[RobMitchell]

I've been having a bit of trouble with grass textures with displacement lately. Here's the thing:

Basically I'm creating a model of a road sign in a field. This is the first time I've had to use grass properly on a large scale and it's proving to be quite difficult (though in tests and other quick practises it's always seemed fine - see below). Here is how the grass is currently turning out:



As you can see, it's kind of showing a wavy effect. Looks more like sand or water at this scale. Sadly this is the best I've been able to do with it in this scene.

I know the grass itself is a great material, as I've put it into practice before to see what I could do with it. Here's a quick example:



It seems straight forward to edit in terms of size, but I've had no luck whatsoever trying to get it to work in my scene with the road sign. Any ideas why this wave effect is here? What I really need is the detail of the grass in the second image to take place in my scene on the first image. What sort of things should I be looking at to get this effect (baring in mind I've adjusted the scale sizes and displacement size. I have also tried renderign with the 'Abs. (cm)' and 'adaptive' boxes checked and unchecked)?

Any help would be great.

(Big thanks to Henriquelana for this great material. )

I'm using Solidworks 2008 (SP4.0) with 64-bit Windows XP and Maxwell 1.7.31.0 plugin.

Thanks for reading.

[krsz]

find this topic:

triangles showing on displased grass

the answer will be there.

krsz

[Luca_Studioaltieri]

or simply subdivide your grass-plane..

[Mihai]

Could you post an OGL view of that plane? It looks like you need a lot higher precision, the waves you see are probably because there is a very low precision used for that particular geometry. It's like an ultra low detail displacement.

[RobMitchell]

Thanks a lot for the responses, guys. Very helpful.

find this topic:

triangles showing on displased grass

the answer will be there.

krsz

Hmm, I found the topic, but this didn't seem to relate to my particular problem. It's a good one to keep in mind, though!

or simply subdivide your grass-plane..

This seems to work well. If I tile the 500x500mm plane (from the second render), it carries the effect across. It's kind of noticable that it's been tiled, though. But I can work around that.

This is the first time I've had the need to use sub-divisions, so thanks for the tip!

Could you post an OGL view of that plane? It looks like you need a lot higher precision, the waves you see are probably because there is a very low precision used for that particular geometry. It's like an ultra low detail displacement.

The plane is just a rectangle, extruded out by 1mm. It's the same as plane in the second render, only much larger. Should I think about adding more shape to the bigger plane?

Thanks again.

[KurtS]

The plane is just a rectangle.

No wonder you have some problems there...
Try to subdivide it to something like 50x50 or 100x100

[Bubbaloo]

This seems to work well. If I tile the 500x500mm plane (from the second render), it carries the effect across. It's kind of noticable that it's been tiled, though. But I can work around that.

Are you tiling the material or subdividing your plane? You should be subdividing your plane...

[RobMitchell]

No wonder you have some problems there...
Try to subdivide it to something like 50x50 or 100x100

Are you tiling the material or subdividing your plane? You should be subdividing your plane...

This is where my rookie side becomes so apparent. :p I tried tiling the 100x100 planes over the full grass floor I was working on. Is subdividing a Maxwell feature (in either the material or studio)? I use the SolidWorks and the Maxwell plugin and I've not seen it mentioned anywhere, so I just assumed it was just a case of tiling a plane.

[Bubbaloo]

It's not an option in Maxwell, it is done in your 3d app. Although I don't know if it's possible in Solidworks.

[RobMitchell]

It's not an option in Maxwell, it is done in your 3d app. Although I don't know if it's possible in Solidworks.

Sorry for the really late reply - forgot to catch up!

Subdividing in that sense is not a feature in SolidWorks. We overcame the problem though by blending in an actual grass photo. Came out looking OK. I might post some pictures in a bit.

Thanks again for the help everyone.

[deflix]

I dont know how to use Solidworks but you need to make your ground plane look like this...