alpha chanel shadow on hdri environment

[bjoern_degroote1]

Hello, i have a question about alpha channel and shadows.

I use a scene with an object, below a shadow matte. Its rendering in a hdri environment. Everytime the shadow effects on the background, in this case the tiling is visible. Is there a way to avoid this?

[ThomasMiller]

Go to your dome light and make your HDRI invisible

[bjoern_degroote1]

I dont use a dome light in this scene. I just made a new file with dome light and made it invisible. So the object renders correct but there is no shadow or alpha any more

[ThomasMiller]

Add the image (HDRI) that you were using in the environment slot (I assume) to the dome light, and voilà!

[bjoern_degroote]

Hello, today i tested the dome light, linked the hdri enviroment to the light but the environment shows up in the shadow. What else can i do? Maybe the shadow is the problem?

[hermit.crab]

Does the matte object's material have a bump map set? Best you attach the scene (and assets) so we can troubleshoot.

[bjoern_degroote]

The objects are using a bump map. I attached the scene.

[hermit.crab]

This scene does not seem to exhibit the issue (maybe because of the missing assets?). Otherwise, I initially thought that the visible shadow streak is basically matte gi from the matte object's base shader, which does seem to happen when there's a bump map plugged.