Hi there, Well, I'm definitely doing something wrong but can't quite figure out what.
When I combine the glossy and diffuse guitar layers the output is not exactly as the guitar combined layer (very minor difference, but it's there), and when I connect it to the alpha over node the result is transparent? 🤔
I tried redoing everything from the beginning but it turned out the same. So I think it's a step elsewhere that I'm missing.
Here's a screenshot of my node tree, and here's my file just in case.
Let me know if you guys see anything!
That's awesome, so glad you found that bug and reported it! Congrats on getting a bug fixed! Making Blender better!
nathitappan - I'm a fellow Mac traveler, and I am having the same issue with alpha as you are.
I started to go through the same steps you've done, but then I found this comment and see that you've already posted a bug.
I just thought you might like to know that you're not the only person experiencing the issue. I'm going to try without the GPU in the compositor and see if that helps.
Cool, I'm glad this helped you figure out that it wasn't your node tree!
Changing from the GPU to CPU fixed it, but the speed change is noticeable.
Hopefully they'll fix it so we can enjoy the beauty of GPU speeds!
I looked at the bug report. You did a great job with it! It was very detailed and looks like it gave them exactly what they needed to replicate the issue.
I see that it is already confirmed, along with the note to turn off the GPU rendering as a work around.
I have encountered the exact same problem!
However changing from GPU to CPU did do something, it still shows a very odd result.
When using the "Alpha Over" node, it only shows the layer that is plugged into the bottom input of the node.
Now upon checking it seems that all alpha layers are value 1.. And I have no idea why. (followed all the exact same steps as Sean did).
I have also tried combining everything using the "mix color" as node set to "mix" mackdadd suggested (and tried other options as well) without usable result.
I am running on a M2 Ultra. (Blender 4.2).
So I guess I have to wait for a patch in a new update?
UPDATE: I made it work.
I also needed to switch to CPU, but during the process of figuring out why it wasn't working, I also disabled the "transparent" in film settings. This resulted in fully white alphas. Enabling this resulted in usable alphas :)
