Video textures

[ihatemylife]

Hello, everyone! Please, help me figure out how to replace screen of a 3D model with my video? I only found an outdated post here https://forum.corona-renderer.com/index.php?topic=17880.0 which didn't work for me. And second question is about cryptomattes — where do I find them? Thank you!

[TomG]

See

for how to use Cryptomatte (main difference since this video is we added by material as an option).

The technique listed in the post should work, can you share the scene, or at least screen grabs that show the set up of materials and objects? What happens when you use that approach? Do note that in the thread there it seemed only some videos or video formats would load properly for the user in question, have you checked other video formats?  Thanks!

[Nejc Kilar]

For the video part, yep, the technique in that OG thread still applies.

- Get that video loaded into a native C4D bitmap loader (just drag it into the node editor, Corona Bitmap doesn't support animations but the native bitmap loader does)
- Plug it into either Light MTL or the Self Illumination slot in your Physical MTL
- Render it all out.

That oughta do it :) If you encounter any roadblocks, we are here.

[wolfgang holtzman]

For the video part, yep, the technique in that OG thread still applies.

- Get that video loaded into a native C4D bitmap loader (just drag it into the node editor, Corona Bitmap doesn't support animations but the native bitmap loader does)
- Plug it into either Light MTL or the Self Illumination slot in your Physical MTL
- Render it all out.

That oughta do it :) If you encounter any roadblocks, we are here.

Is this also how you would do an animated gobo? For gobo it would have to be a light material or light object I suppose?

[Nejc Kilar]

Yes indeed, that would be my approach as well.

Create a Light MTL, have it be driven by the animation, and then plug it into a Corona Light which is set to operate in MTL mode (screenshot attached).

Alternatively you can just apply the Light MTL onto a plane and do it that way.

For the Gobo-ish effect you'll need to go with really high directionality and if you'd like a crisp clean projection I think some of our users suggested using standard C4D lights.