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Quick Tip: Compositing CG Into Tall Grass (Patreon)

Published:
2023-03-30 02:08:01
Edited:
2023-03-30 03:03:17
Imported:
2026-06
Tags:

Content

What it says on the box! I made this little grass asset a while ago and I use it surprisingly often! DOWNLOAD:Grass Asset Related Links:Tripod Tracking (ship landing in field) Destroyed Cars Asset(and the background clip I used in the video, if you want)

Files

Quick Tip: Compositing CG Into Grass

Comments

Mahdi Poursamad

VFX problems are a lot simpler than they look 😂

Bennett Greene

Would you be opposed to giving out the base footage in the future for practice? Just so when I'm following along I know exactly where my problems are and not left wondering if it's me or the footage I'm using, thanks!

Bennett Greene

also sorry about the weird spacing don't know what happened there

Anon

do you have any advice on tracking drone footage flying over hills and I- want to reconstruct the hills in 3D. I know PFTrack has this mesh future. Is there any way I can take my tracking point and create a rough mesh that is connected by the tracking points? There must be a way to do this in Blender, maybe with Geo nodes? Thanks!

Zeke Faust

If you select all your points and click "3d markers to mesh" you can convert the trackers into vertices. Then in geonodes, add a "points to volume" followed by "volume to mesh". FYI, you need to have a pretty dense point cloud, and it doesn't always align with the footage depending on the volume radius, so you might have to shrink in the normals a bit. Probably not the best way but a fast one

Pokemon Planet

Lmao. This is my definition of genius. Such a simple solution to a complex problem. I would never have thought you could essentially fake the colours of grass like this.

Richard Cave

thank you, I am about to start filming in Scotland and this has given me some comp confidence for later on.

Maxime Gerardin

Cool trick! The glitching you might get when layering too much of those assets comes from the lack of 'Transparent' Light Paths in the render settings. It it set by default to 8 but you might want to increase this value if some black glitch patches appear.

David Peate

Thanks Ian. At 4' 25'' when placing the cars in the environment, how do you know the correct position relative to the camera? Is it just trial and error to see if they sit properly on playback? So did you just get lucky in this record? Same with the ground plane you make up. Feels like the bumps' position relative to the Blender camera is arbitrarily placed, though I imagine it's not.

The Water Lettuce Society

This is super helpful, one problem I ran into though was when selecting holdout on the image plane, it would use the whole plane as the holdout, not just the grass image. Any idea what’s going wrong there?

Blemonade

Maybe you were using eevee and had opaque instead of alpha blend set in the transparency settings?

The Water Lettuce Society

I figured it out, turns out when I was importing the video, I forgot to check use alpha

Paul Major

Love this, and the full walkthrough on the back half was very helpful, thanks!

Henry Lightfoot

you can also add a grass particle system on the shadow catching plane and then comp this back onto your footage, if film is turned to transparent. The grass particle system both catches the shadow, while the objects are invisible, and also when comped on top it adds a mask for the grass which can also be animated to create that flowing in the wind effect. Hope this helped anyone looking for an alternative method.

Carter Burr-Kirven

Good stuff! Just a note, you don't need to connect the alpha to the AlphaOver node, since the alpha is already carried in the yellow RGBA stream—plugging in the alpha there is actually doubling-up the matting operation and could cause edge problems

alex

🔫🥷🏻PUT THE GREEN SCREEN WORKFLOW TUTORIAL ON THE TABLE!

alex (edited)

Comment edits

2026-09-20 10:00 <3
2023-04-04 09:02 <3

<3

Tim Drage

the shot is just panning with no parallax movement so it would be a 2d track effectively and doesn't matter so much where you put things in 3d space (i think)

Axel Gutierrez

Is there any other way to apply the holdout effect from Evee?