Quick Tip: Compositing CG Into Tall Grass

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

Axel Gutierrez

What a world!

Ian Vernon

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)

Tim

<3

alex

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

alex

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

Carter Burr-Kirven

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.

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

Paul Major

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

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

Blemonade

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?

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.

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.

Maxime Gérardin

very nice, thank you

Tolga Katas

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

Richard Cave