Topics

1

[Max] I need help! / Maxscript: Test if one viewport is the interactive window

« on: 2025-03-14, 14:11:07 »

Hey all, I'm curious to know if there is a method in MaxScript to check if one of the viewports is set to the Corona docked interactive viewer.

This page https://docs.chaos.com/display/CRMAX/MAXScript suggests you can check this while currently rendering using getRenderType, but I can't see anything for when max is idle.

Obviously visually it's quite clear if the viewer is present, but I need to do this via script for a tool I'm working on.

2

[Max] I need help! / Is "image upscaling factor" exposed to maxscript?

« on: 2025-02-04, 17:24:03 »

Title really.

We have a tool for enabling/disabling/altering certain things during interactive rendering and it was requested that I add the ability to change Image Upscaling Factor of IOR.

I tried "showproperties renderers.current" but couldn't see anything in the list that would be relevant.

TIA

3

[Max] I need help! / 3DS Max/Corona saving out corrupted EXR's

« on: 2024-07-02, 10:33:01 »

Hello, we've had a couple of projects saving out with corrupted exr's recently.
When viewed in Photoshop they display as completely white and Corona Image Editor shows the error:

Cannot operate with image file
"[filename]"

It is either incomplete, or not stored with a floating point precision.

3DS Max 2024.2.1
Corona 11.1

We can load the exr's through 3DS Max's frame buffer and resave, but the images still have problems (bad alpha for example)

Has anyone else experienced this issue?

4

[Max] Feature Requests / Choosing specific elements for CXR

« on: 2024-06-25, 16:00:46 »

There was some discussion in this thread https://forum.corona-renderer.com/index.php?topic=35535.15 that for Cryptomatte it would be beneficial to only output that element into a .cxr file, whilst saving the other elements out in another format in an effort to prevent the file from being larger than necessary.

We're investigating using Cryptomatte more in our workflow (even more so now material masks are supported) and huge CXR files could potentially be a big stumbling block.
I appreciate this may be too late for 12 but in future versions is there a chance this might get looked at again in the future?

5

[Max] Feature Requests / VFB Save button default path

« on: 2024-04-11, 10:18:56 »

Hey Devs!

Currently it seems the VFB's save button defaults to the same path as the max file that you're working on.
Would it be possible (or beneficial?) to use the current render output filepath instead?
I sometimes will disable "save render output" for test frames and still want to save out a test to the same location.

Cheers

6

[Max] I need help! / Texture map colour in RawComponent (diffuse)

« on: 2024-04-02, 16:44:35 »

Hey all, we're currently looking into using render element compositing/back-to-beauty workflow as a means of being able to swap out textures on a product without having to re-render.

The issue that we're running into is that we can't get a "clean" diffuse component element (i.e. purely lighting, no texture information) to work with as the CShading_RawComponent (set to diffuse) still includes the texture detail.

Comparitively, the VRayRawLighting render element only includes lighting information and can be multiplied over the diffuse filter element to obtain a RawLighting element (or the math works backwards too).
https://docs.chaos.com/display/VMAX/VRayRawLighting

Am I missing a trick here or is this just the way that Corona is set up?

For reference I'm setting the comp up in Blackmagic Fusion with 32bit exr's. Attached is a sample of the comp layout.

Thanks

7

[Max] Bug Reporting / Some maps are reported as changing during IR

« on: 2024-03-08, 11:22:11 »

Hi, we've noticed on some assets that Corona is displaying the error "Render had to be aborted because a bitmap on disk changed and is being reloaded".

It seems to be isolated to 3DS Max standard bitmaps when they are loaded in the material editor (slate and compact) during IR.

Where is the best place to upload the problem scene?

3DS Max 2024.2
Corona 11.1

Cheers

8

[Max] Feature Requests / Improved support of max colour management

« on: 2024-02-01, 17:53:33 »

Title.

We've been playing around with AgX as mentioned in some other posts and would ideally like to make use of it in Max's color management instead of the current solution using LUTs, however Corona currently doesn't support the "OCIO - Custom Config File" option.

9

[Max] Feature Requests / Memory usage breakdown improvements

« on: 2024-01-26, 16:50:33 »

This tool is fantastic for helping to narrow down the objects with unnecessary displacement/crazy resolution textures etc. but would be even more helpful if there was an option to select the objects listed/put the material into the material editor, resize textures.

10

[Max] General Discussion / Tile rendering issues

« on: 2023-12-12, 14:55:17 »

Hey guys,

For a while in the studio we've been using "tile" rendering to divide large images into smaller jobs on the farm but recently we've run into an issue where there are lighting discrepancies at the border of the each tile. We initially thought it was down to the UHD cache being read incorrectly but after some testing it seems the issue is coming from elsewhere.

3DS Max 2024.1
Corona 10.1
Pulze 2.2.6

It's worth noting that the issue only started appearing after we upgraded from Corona 9.1 to 10.1 so I believe the issue has come through that update. So far we've tried:
- setting secondary GI to UHD Cache, 4k Cache and Path Tracing
- bloom and glare disabled
- caustics disabled
- use legacy environment map filtering (this was already on as the scene was originally created in 9.1
- disable adaptivity

The issue is mostly visible in the Direct/Indirect/Reflect elements (and of course beauty)

I'll see what we can do about getting a test scene over to you guys too.

Cheers

11

[Max] Bug Reporting / Corona 10.2 CoronaMultiTexture/CoronaColorCorrect crash

« on: 2023-12-07, 15:55:51 »

Hey guys,

I've had a scene regularly crashing on me - I initially thought it might be due to a bad downloaded asset but since dropping in another one the issue persists.

The object renders fine using the material the object came with but crashes after around 20 passes or so if I insert a CoronaColorCorrect or a CoronaMultiMap into the material tree.

Minidump attached.

Thanks

12

[Max] I need help! / Is the optix plugin stored in the same place regardless of version?

« on: 2023-08-29, 17:35:05 »

Hey, we recently updated to max 2024 and Corona 10.1 but for older projects have kept our Max 2022 install on 9.1.

We've noticed that some scenes are getting an error of "Missing DLL: optix.6.5.0.dll" in Max 2022

Is it possible that the installation of Corona 10.1 has removed this from the Max 2022 installation, or that both versions are installed to the same location and 6.5.0 has been overwritten by a newer version?

Cheers

13

[Max] Bug Reporting / Issues with UVWRandomiser and Real World Map Size

« on: 2023-07-25, 10:56:55 »

We recently discovered that when you use a UVWRandomiser in conjunction with real-world map sizes it produces some strange looking results.

In the attached image both squares have a similar material applied. The one on the left is using a UVW modifier set to 130cm box and the bitmaps are set to 1:1 tiling.

The one on the right is using a UVW modifier set to "real world map size" and box, the maps are then set to real world size 130cm (or tiling of 0.008)

Both sets of maps are being run through CoronaUVWRandomiser maps with the following values:
U Offset - from -1.0, to 1.0 step 0.0
V Offset - from -1.0, to 1.0 step 0.0
W Rotation Offset - from 0.0, to 360.0 step 180.0

Randomise each tile: Y

Everything else is default.

What I believe is happening is that the UVWRandomiser is randomising at the boundary of each UVW mapping tile (1cm in the realworld UVW case) rather than the boundary of each texture. Whilst the functionality is "corrrect" the ideal scenario for realworld map sizes is that the offsetting is done at the texture boundary - at least where rotation is concerned.

When offsetting is zeroed out and only rotation is used the issue is less noticeable but still present.

The issue is not present when using triplanar, although I noticed the blend line seems more hazy/lacking in contrast.

max 2022.3.10
Corona 9.1

14

[Max] Feature Requests / Corona Proxy User Defined Preview Mesh

« on: 2023-06-06, 14:54:48 »

Now that photogrammetry is becoming so widely used it would be awesome if we could define a low poly mesh for CProxies to display rather than "full mesh" or "point cloud" modes.

Megascans in particular offers multiple LOD's of their models so it would be relatively easy for the user to download multiple "resolutions" of an asset, export one as their "high res" to be used at render time and keep the other purely as a viewport display if such an option were available.

Perhaps with enough user support Epic could be encouraged to automatically set this up in their exporter too :)

Cheers

15

[Max] Bug Reporting / Corona Colour Correct exposure is backwards when "invert colours" is enabled.

« on: 2023-05-23, 16:10:18 »

Title sums it up.

If you enable "Invert Colors" on the Corona Color Correct map, then increasing the exposure makes the map darker and decreasing exposure makes it brighter.