Daniel Huiting

Hi All!

I am creating grass using Vellum Hair via this tutorial: https://www.youtube.com/watch?v=QlX7_okxOJA [www.youtube.com]
The shadows on the grass texture flicker. I noticed he doesn't have the flickering shadows like I do.

I have the grass tapering using a uv texture with rows and columns post-sim and then a wrangle with:

f@u = v@uv.x;
f@width = chramp("remap", f@u) * ch("size");

This wrangle controls the grass taper.

Not sure if I can do some vellum post process or if I have to re-sim with the polywire before the vellum solver instead of after, or if its a normals issue, or using the uv texture post-sim, or what.

Attached is a video of the problem, a screenshot of the nodes, and a .hiplc file. If possible to reply with a .hiplc file as well would be much appreciated.

Thanks!

toadstorm
It's possible to bend each instance uniquely, but as Enivob said it's not going to be efficient at all because each copy will be unique and you lose all the benefits of instancing. It might be better to make a few variants with different amounts of bending, then randomly instance those variants to points.

If you do need to deform each instance individually, it has to be done in a for/each loop. See the example here: https://www.toadstorm.com/blog/?p=942#for-each [www.toadstorm.com]

I think this is a great idea. I could use a little help setting it up please. Do I make say, 5 variants spaced out so they aren't touching, merge them, add connectivity SOP with custom attribute, then use that attribute to drive random copying to points somehow?

I just need help setting it up. If possible to send a screenshot or even better a .hiplc example that would be great!

I'm following this tutorial (https://www.youtube.com/watch?v=qIP_Ai4Had4) and trying to make a grass generator. I have grids copied to points with random orient and scale, and I want to bend in random amounts with random directions. I have the random bend amount working, but the bend direction is all going one way (see screenshot). I want the bend direction pointing many different random directions and have that be controllable some how for randomness amount.

I've attached a .hiplc file of where I am at so far. If possible to respond with a working hiplc file that would be great!

thanks,