HDRI and transparency in the render ?

Hi,

I’m new on UE5, this looks really interesting but I have some difficulties with rendering for compositing.

I have a scene with geometries, trees, etc…

The lighting is done by a HDRI Backdrop and a directional light.

I have a main geo with a shader with “AlphaComposite” as blend mode.

And I would like to have my scene lighted by my two light but with the HDRI not visible in my render. I mean used to light the scene but with the image of the HDRI not visible in the render. Like a “primary visibility” turned off in Maya.

Alpha is activated on project settings (linear color space only) but this is not working. But it’s working when I only used the directional light.

I tried in png and exr.

Also, I don’t understand why but when I activate anti aliasing in the movie render queue panel, the mesh with “AlphaComposite” shader turn black and not transparent.

Please, someone can help me to have AA, HDRI and transparency ?

Many thanks :slight_smile: