Hello, crew.
I'm rendering a simple animation and saving as a PNG sequence and no alpha is being saved.
-I'm using Arnold
-Yes, "alpha channel" is checked in file's setup
-tried it with both arnold render view and regular render view
-both render views are showing the alpha. but it's not making it to the file
-I've used photoshop, AE and "view image file" in max. All not seeing an alpha channel in the file.
BTW- if I render a single frame and save that manually, I get an alpha channel in the PNG. This is only happening when I render a PNG sequence.
I've attached one of the files to this post.
Thanks.
While trying to STILL resolve this issue, I discovered that any animation created in Max 2024 and loaded into Max 2025 IS saving an alpha channel in my PNG sequence.
I even loaded an animation made in Max 2024 into Max 2025, deleted all elements, and imported/merged an animation made in Max 2025 and that animation is now rendering alpha in my PNG sequence.
So, something about creating animations in Max 2025 is blocking it's ability to save alpha with PNG sequence files.
I have similar experience when I trying bake some maps, none of them came out with alpha despite the standard png setting.
This always bugging me and I decide to analyze what would be.
I think I'm close but I don't know what is the exact root of the problem.
I found two troubleshoots for this.
First. choose "Save File" and setup the png settings, next, select the preset "3dsmax.scanline.radiosity.draft", load the preset, then, go back and choose Arnold in Renderer option, and Render. Now you can see the PNG with alphas embedded.
Second. When you choose the file name, select (overwrite) some previous PNG which had transparency and Render.
Hopes this works, if I found a more logic way to improve the fix I'll let you know.
I Found that the new color space default is the issue (OCIO), i changed it back to gamma in Rendering>color management and it is saving alphas in png, i guess that is why if you open a scene from previous versions it renders normally as they were created using gamma workflow
Is it there any setting we should change in OCIO for rendering images with alpha channel?
Looks like a limitation in OCIO in 3ds Max to me. Switching to Gamma Workflow bypasses the OCIO part.
I can reproduce the incorrect alpha channel with Arnold and Scanline rendering, as long as OCIO is active.
Martin Breidt
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