3D grass on roof

[Anonymous]

Hello,
I have some question, maybe some of you guys will have solutions.
My problem is:
I would like to add 3D grass like roof covering (i have GDL object of grass, but I can't rotate it by roof angle). And if possible,how can I made automatic roof "grassing", so far I'm using just image of grass for my houses, and it's not so natural then it's rendered.

[Steve Jepson]

This is not an ArchiCAD solution but you can do this with ArchiCAD and the Maxwell Render plug-in for ArchiCAD. There is a grass material for use with ArchiCAD that you would like very much if you can handle the poly count.

ArchiCAD can handle Maxwell Render materials just fine using the free plug-in. You can try it in the Demo to see if you like it.

[Karl Ottenstein]

Add a signature with your version of AC, etc... or include that in future posts.

If you have 16 or higher, you can convert your grass GDL object into a Morph and rotate it.

ArchiCAD won't handle well all of the polygons created when you multiply that object over your roof. Perhaps the Maxwell shader that Steve mentions, or if you have Cinema4D, the "hair"/grass function would work well. In Artlantis, you can rotate/multiply grass objects, but it can handle lots of polygons easily, unlike ArchiCAD.

Artlantis and ArchiCAD objects, once rotated, will have your grass growing out of the roof perpendicular to the slope of the roof, not vertically like real grass would grow. If you convert to a Morph in ArchiCAD 16/17, then you can use the 'box' adjustment to skew the tilted grass and force the grass to grow vertically again I think.

[Anonymous]

Hi I'm using AC16, I will try to use your advices, thank you for Ideas!