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Quick Tip: Compositing CG Into Tall Grass (Patreon)

Published:
2023-03-30 02:08:01
Imported:
2023-04

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

Anonymous

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

Tolga Katas

very nice, thank you

Maxime Gérardin

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.

Anonymous

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.

Anonymous

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?

Anonymous
>>105231753

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

Anonymous
>>105231753

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

Anonymous

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

Anonymous

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.

Anonymous

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

Anonymous

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

Anonymous
>>105229235

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)

Anonymous

What a world!

Anonymous

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