How to remove HAP Alpha edge artifacts on 3D layers?

[davidbk]

Hi,

I'm noticing some edge artifacts on my HAP videos with an Alpha channel. I created the HAP files from an OpenEXR image sequence with an alpha channel in After Effects. In After Effects, the images look nice, but in Smode I have an ugly black outline around the edges. I have experimented with the numerous alpha interpretations (Straight, Preultiplied, etc.) and gamma value, but none of them seem to fix the issue. How do I fix the alpha edges?

[davidbk]

Here is the same image sequence when viewed in After Effects. This is how I want it to look.

[Walter_heen]

Hello!

Do you think you can provide your HAP video and the image sequence in order to see what is the problem ?
maybe the modifier utility->alpha chocker can help you but i'm not sur

[davidbk]

Thanks @Walter_heen. I tried the alpha choker but it did not fix the issue. Can I PM you the video files and image sequence to take a look? What's your email?

[Walter_heen]

Hello!
Yes for sure!
You can send me your files at: erwan@smode.fr or on facebook: walter heen

[davidbk]

@Walter_heen After experimenting with this, I was able to find a solution. I noticed that when the layers are set to 3D, the 3D layers need to have the same stacking order (with respect to the camera view) as the layers in the Element panel. So if layer A is behind layer B in the 3D scene, layer A needs to be behind layer B in the Element panel. If not, you get that ugly black alpha edge I show here.

Is this always the case? Is there a workaround to have the alpha edge look correct, regardless of layer order?

[Walter_heen]

ah yes i see.
It depends of the order of layers that Smode have to calculate.
I think you'll find the more answers in first topic of the FAQ:
https://smode.fr/doc/help/FAQ/FAQ.htm?Highlight=faq

cheers!