Daniel Huiting

It seems the project file and 2nd screenshot didn't attach. Here they are.

Also, I'm working in Houdini 21.0.440 FYI

thanks!

Hi!

I have a 3d tracked drone shot and I want to add 3d extruded text on the ground as the drone pulls back. I have things set up and its working fine, but I need to see reflection of the text and its ground shadow in the windows but NOT reflection of the ground plane in the windows (which is a grid in SOPs used as primitives in a background plate node in Solaris, and I pasted the original background plate jpg sequence into the plate parameter of the background plate node, so we don't see the grid in the render, we just see the reflections of the background plate on the text, which is what I want.)

I tried rendering out just the text reflections only (and turning the grid off entirely), but the problem is that I need the bounced light from the background plate grid to light up the text that I will be seeing in the reflection of the windows.

If there was a way to tell the glass material to only see the reflections of the text object and not the grid object I feel that would solve my problem. But I can't just tell the grid object to not be visible in reflections because I need to see it reflected in the text. I also need the shadow from the text on the ground in the window reflection.

(The reason I don't want to see the ground plane bg plate in the reflection is that there is already a real reflection of the ground in the windows and I don't want 2 ground reflections.

My plan in comp is to use the lighten blend mode to get the text over the windows since the text wont show through the lighter grid lines on the windows, but if that doessn't work I can try and track some grid masks in after effects to get all the little window cutouts.

Any help would be appreciated, thanks! I have attached the project file, and screenshots of the issue.

It wouldn't let me attach the background plate jpg sequence but here is a Wetransfer link to download that if you want to open the project: https://we.tl/t-kZvfLhVGKf [we.tl]

thanks!
-Dan

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!