Chaos Corona 15 for 3ds Max Previews Discussion.
You can grab the latest Preview from: [Previews Changelog](https://forum.corona-renderer.com/ Chaos Corona 15 for 3ds Max - Previews (Daily Builds) Changelog )
For reference, in a test I did for an HD animation where only the camera was animated, on a scene with particularly heavy parsing:
Corona 15 takes 1m 26s to parse on the first frame, and 0s on all subsequent frames
Corona 14 takes 1m 26s to parse on all frames
So across a 3 second, 90 frame animation that would save 2 hours, 7mins, and 34s in render time (since this savings is only on the parsing time, the exact % of time saved will depend on how many passes etc. which determines the actual time to clean up the image and adds to the parsing time).
Bravo guys. That’s a really impressive list of stuff that will positively impact real-world use. Look forward to testing this soon!
Amazing news! Just did a first successful test.
Thanks for testing, and glad it was giving you some good results!
Some more internal testing - GI bounces from GSplats.
The first shows the difference between GI off and on for the GSplat in Corona 15:
Not only is the shadow more pronounced, but of course picks up the color from the GSplat (the pot and cactus are GSplat, the rest is regular geo). OFC this still doesn’t do any lighting ON the GSplat itself.
And for fun and to call out the color shift, I used the GSplat’s own color correction stack to change the color since there is a significant shadow difference overall with it on and off (both here are with GI enabled for the Gsplat):
And equally, with GI on, but completely desaturating the cactus and pot in the GSplat color correction:
PS be sure to swap to “slider mode” for comparing the images rather than look at each separately
1 In image resolution override, Could we have also a Image Aspect option, many times its faster to set up, also could we have it in a separate tab?
2 I dont know why you didnt manage to add a Composition helper, would it be difficult to introduce?
3 About version checking, I like that we could have notified even with preview versions, could we have also a display in the VFB, since this is the first build we dont know how this notification would be showed but… Im pretty sure that if the message is displayed only at startup it will be missed.
- i am not sure what you mean - you mean a viewport background image override? This can be controlled in viewport configuration. If you mean camera aspect ratio override, then you simply set the width and height, then lock the aspect ratio and change it if needed. If you mean specific (16:9, 3:4, etc.) presets for aspect ratio, than can be an improvement. Feel free to submit an idea for it in ideas portal.
- Composition guides are a separate thing, not related to resolution override.There may be some news about it in future.
- With quiet mode, maybe, but with regular mode it is a new notification for users, so they might be more attentive to it. There is also a notification button in Render Settings > System tab. Adding it somewhere in VFB may clutter the already optimized space.
Hope this helps.
Hi there, I believe something is broken when saving to EXR format? I tried saving a couple of renders to EXR as usual on multiple scenes, and it seems that the EXR file is empty except for the beauty pass. All the layers have names on them, but no actual data ive attached a screenshot from Photoshop with what the layers look like. The weird part is that i tried multiple scenes and still get the same result.
but when I tried to save as CXR I got all the layers and passes to be saved correctly, so i tried saving from CXR to EXR and the issue still persisted and ended up with no layers and passes.
I attached my EXR saving setting, which I have used previously in almost all of my projects so its nothing new there along with the render passes in the same window
I believe this is a known limitation currently - automatically add render elements (multilayer EXR) does not work, at least with Corona (maybe even in OpenEXR implementation in general).
What you can try to do is simply save to CXR from Max and rename it to EXR - this should have all the layers there.
i just tried that and it worked, so it used to work in earlier corona versions but a limitation for the current one?
No, it didn’t work in earlier version too. It is not something purely Corona related.
Hi, the problem is confirmed, thank you for reporting it.
In Corona 14 U1 HF1 everything is working as expected.
In the 15 Preview, render elements are saving as black/empty when saving from the Corona VFB with the “automatic” or “manual” render elements include option for the EXR format.
(Report ID=CMAX-2194)
Actually this was already in the plan for Corona 15, and is currently in testing before going out in the previews. I forgot to add it to Trello though, so have updated that now 
We would need to understand how exactly the scene is made. Can you please contact us at https://support.chaos.com/hc/en-us/requests/new and attach your scene?
Thanks in advance!
Can you share the Beauty pass, and the material on the big object? Hard to tell, but it doesn’t look like it’s the entire alpha mask just that front edge, so I am wondering if this isn’t “bloom” at all but some transparency or something in the material, would be good to see what we are looking at here
OOP Edit, or the scene is even better yes, there was an extra page on the replies and I didn’t see Marcin’s
Check this option.
It is in improvement/option introduced earlier, not specifically v15 preview related.
Earlier if you had a render with alpha (say a light rendered against background or sun in the sky) and you saved it to e.g. PNG with enabled alpha, you would lose the bloom and glare, as their alpha was 0.
Additionally:
- unwanted additional EXRs (like using CXR) for every render element
- black/empty result when calling getlastrenderedimage() in maxscript. Render and then try:
test=getlastrenderedimage()
display test
Good Luck
Redundant render elements was already reported.
Broken getLastRendererdImage() command is now reported: (Report ID=CMAX-2201)
Thanks