Complete list of smaller changes, bug fixes, etc. from Corona 15

Corona Corona Common Announcements
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Hi all!

We are still looking for the right place on the website to store the “complete list of changes” for a Corona release - and that’s why it has taken us so long (ahem) to finally get that list to you. Rather than delay any longer, we’re posting it here to the forums in the meantime:


The larger features in this release are shown on the release page.

Below is a list of all the other smaller changes, bug fixes, etc. that were included in Corona 15 for 3ds Max and Cinema 4D (note that this does not include fixes from Corona 15 Hotfix 1).

BOTH 3DS MAX & CINEMA 4D

User-Facing Improvements

  • Added Chromatic Aberration as a post effect in the VFB and the CIE.

  • Added a check for new Corona versions. A message showing that an update is available is shown at startup (3ds Max) and shown in the About dialog and in the Preferences (Cinema 4D). This notification can be disabled in the system settings.

  • Removed the old material library from the Corona Toolbar - all materials and more are accessible in Cosmos.

  • The VFB icon is now animated when rendering is running, including when the VFB is minimized (note, this can be disabled from preferences).

  • Added Chromatic Aberration to post processing effects.

  • Added collapsible subcategories in Lister

  • CIE - removed the “bake” button from the VFB LightMix tab in the Corona Image Editor and Standalone.

  • Corona Image Editor - enabled drag drop to CIE for EXR files.

  • Added VFB settings to the VFB dialog.

  • Added an error message informing the user of the file size limit for AI enhancement.

  • Added the option to not ask for confirmation again when resetting the LightMix.

  • Added LightSelect pass name to color picker dialog when opened from VFB.

Bugfixes

  • Fixed unexpected changes to the color management settings when resetting render settings in Render Setup or when opening Render Setup while custom default settings are present.

  • Fixed inconsistent state of color management when having custom color space set in the defaults config. Fixed freeze when resetting settings while legacy color management is on.

  • Fixed IR restarting when opening Render Setup.

  • Fixed issue where some objects with some modifiers were not reparsed when changing time during interactive rendering.

  • Fixed missed logout while running two and more applications simultaneously (Standalone, Image Editor, Corona for 3dsMax, Corona for C4D).

  • The License Server is now not installed if the remote License Server is picked during installation.

  • The Installer now does not let selection of the Cloud Licensing if either offline mode or the Remote License Server is already used.

  • Fixed Slicer caps Polygon IDs for multi-material objects - they are now taken from base objects, not from the Slicer.

  • Corona Image Editor (CIE) - Color space information is now also loaded from a CXR on open.

  • CIE - Fixed Auto-Adjustment of exposure and white balance not working in the command line version.

  • CIE - Fixed wrong pre-filled extension in the CIE Save dialog.

  • CIE - Fixed issue where the CIE didn’t denoise render elements when using the NVIDIA AI Denoiser.

  • CIE - Fix of missing updates of the Render Stamp after opening any file.

  • Fixed issue where changing light intensity units changes actual light intensity.

  • Fixed issue where a Corona Sun could in rare cases generate NaNs.

  • Fixed loading issues with certain .ply Gaussian Splat files.

  • Fix of http://localhost being incorrectly shown as Remote Licensing mode.

  • Fixed reset of environment settings in Vantage (via Live Link) when objects were moved in 3ds Max / Cinema 4D but no changes were actually made to the environment.

  • Fixed issue where a Fabric material inside a Layered material could lead to NaNs and even a crash.

  • Fixed computation of UVs for curved decals (No Tiling option on bitmaps now works).

  • Fixed issue where Slicer with inverse behaviour didn’t respect include and exclude settings.

  • Fixed DPI scaling for the VFB toolbar.

  • Fixed Auto Adjustment (exposure and white balance) not working with Render Regions.

  • Fixed incorrect Camera physical box in Interactive Rendering.

  • Fixed issue with Volume grid emission and absorption not working in new versions of Vantage.

  • Non-physical properties of a Corona Physical material are now converted to Vantage and VrScene.

  • Fixed possible freeze when clicking on the AI Enhancer option in the VFB.

  • Fixed Cloud Licensing not working on x86_64 machines that do not have AVX support.

  • Fixed issue where Cloud Licensing might not work in some cases when installed to a location containing localized characters.

  • Fixed unresponsive License Dialog window due to a blocking periodic license recheck.

  • Fixed issue where accurate environment sampling could have more fireflies with ray differentials than without them.

  • Fixed rare cases where a plugin could fail to load due to a conflict with some 3rd-party software (e.g. Siemens NX).

  • Fixed issue where failing to save an image could crash the CIE, and sanitized render element names when saving all elements.



SCATTER

User-Facing Improvements

  • (3ds Max) Moved the generation of Chaos Scatter instances into the core. Some tests show more than a 40% speedup for initial scatter parsing.

  • (3ds Max) Added automatic detection of dependency loops involving mutual scatter avoidance relations.

    • The plugin now prevents invalid configurations during Scatter setup and automatically disables affected scatters if circular references are created indirectly. Users will receive warnings identifying the affected scatters.

  • (3ds Max) Added curve-based falloff control for the Include/Exclude area modifiers.

  • Instances with random X/Y translation now conform to the mesh when scattered on non-vertical surfaces.

    • Instances moved outside of distribute-on objects are automatically trimmed

  • (3ds Max) Enhanced curve editor: simplified UI; Curve defaults preserve legacy behavior; fixed Include area falloff slope orientation; removed redundant Histogram text. (Cinema 4D uses the native C4D curves).

  • Changed defaults for per square and per cube values.

Bug Fixes

  • Area filters and modifiers now evaluate at final instance positions after transformations.

  • Scatter version in About dialog is now consistent with Windows Program and Features reported version.

  • (Cinema 4D) Show a warning when “make editable” is used for Chaos Scatter without a supported renderer (i.e. Corona/V-Ray) being active.

  • (Cinema 4D) Fixed scatter not respecting the visibility of instanced objects.

  • (3ds Max) Fixed issue where an accidental inter-scatter dependency loop invoked an update loop. Now scatter dependency loops are prevented.

  • (3ds Max)Fixed crashes occurring when a referenced scene was deleted while using the Lister.

  • (3ds Max)Fixed an issue where the Map button/node failed to update after a map assignment was rejected by 3ds Max.

  • (3ds Max)Fixed crashes triggered by topological changes to distribution objects with custom brushed instances (Scatter now safely removes these instances and notifies the user).

  • (3ds Max)Fixed redundant IR restarts that occurred after every Scatter configuration change.

  • (3ds Max)Fixed unnecessary IR restarts triggered by object selection in the Material Editor.

  • (3ds Max) Fixed an issue where the Previz type failed to revert to its original value after exiting ‘Edit Instances’ mode. Also improved instance override coloring.

  • (3ds Max) Include/Exclude splines now behave consistently with distribute-on splines in regards to visibility settings (Enabled in Renderer, Enable in Viewport).



CINEMA 4D

User-Facing Improvements

  • Conversions of materials and shaders can be done directly from the Node Editor.

  • Added Corona plugin menu also to Sculpt and Pipeline menu presets (available in Cinema 4D R25+).

  • Added the possibility to choose a default bitmap type in the Corona Node Material Editor.

  • Gaussian Splats and Corona proxies now use much faster drawing of point clouds in the viewport:

    • Gaussian Splats can now realistically handle showing millions of points in the viewport at reasonable speed (note that this feature is currently supported in Cinema 4D S24-2026 with the exception of 2025.3.3).

  • Added initial core support for rendering Particles via the Corona Particle render tag and new Corona Particle material - we now invite YOU to tell us how you want to use particles, what controls you would like to see, etc. so that we can make Particle rendering what you want it to be!

  • Experimental Enhanced viewport preview for the Corona Physical Material (can now show Diffuse, Bump, and Emission).

  • Improved viewport preview for Corona Lights in sphere, cube and cylinder shapes.

  • Updated Chaos Cosmos and ULA, adding support for multiple users on a single machine.

  • Added option to set file count limit in the VFB history.

  • Improved speed of creating viewport previews of Corona materials.

Bug Fixes

  • Fixed white window appearing when saving a file from the Corona VFB on macOS.

  • Fixed truncated zoom menu items in the VFB on macOS.

  • Fixed issue where licensing would fail on macOS with an error about a different user being signed in even when that wasn’t the case; improved the information shown in related error message.

  • Fixed issue with the Installer on macOS not properly setting up the configuration for the License Server or Cloud Licensing.

  • Fixed issue with incorrect generic licensing error sometimes showing on macOS when reporting errors with the ULA.

  • Fixed NaNs when rendering LightMix with the Render Queue.

  • Fixes when using automatic saving from Team Render:

    • Fixed black image output when OCIO is enabled (v14 hf1 regression)

    • Fixed the dithering option being ignored.

    • Fixed image still being saved when the whole Save tab is disabled.

    • Fixed saving not taking into account format options (e.g. JPEG quality).

    • Fixed several issues when saving using an absolute path.

    • Fixed saving enabled with an empty path potentially saving the image in the working directory.

    • Fixed issue with possible color banding due to inconsistently reduced precision of saved image (especially when using OCIO with ACES color space).

    • Fixed OpenEXR was not using the render color space when OCIO was enabled.

    • Fixed issues when saving alpha and separate alpha when OCIO was enabled.

    • Fixed issues when saving multi-pass in multi-layer file format when OCIO was enabled.

    • Fixed incorrectly saved CXR when OCIO was enabled.

    • File format-specific configurations are now not hardcoded, but read from the format plugin (improves support for 3rd-party file format extensions).

  • Added experimental option (“Strict thread affinity” in Corona Preferences) to tweak core affinity locking to help diagnose some reported performance issues.

  • Fixed incorrectly working tiling options in the Fabric material.

  • Fixed issue with keyboard shortcuts in the Corona VFB on Windows not working.

  • Fixed crash when saving a scene containing Xref referencing document with a Corona Camera.

  • Optimized color conversions, fixing some rare issues like black vertical lines in saved images.

  • Material and shader positions in the Node Material Editor now stay the same after conversion.

  • Fixed issues where multiple skies with the same celestial object (i.e. Sun/Moon) could cause infinite IR restarts; we now show a warning when the celestial object’s position is controlled by multiple skies.

  • Fixed NaNs when a camera is set with zero scale.

  • Fixed issue where the crop box of a Gaussian Splat would be automatically re-fitted after loading document.

  • Fixed possible crash when removing a knot (control point) in the HSV gradient UI in a VolumeGrid.

  • Reduced UI lag when working with materials in scenes with a lot of textures in the directory hierarchy.

  • Improved the clamping of colors in the VFB when using the OCIO view transformation.

  • CXR file output now correctly lists 32-bit output and alpha support in the format details in the UI.

  • Fixed Undo creation after deleting shaders in the Corona Node Material Editor.

  • Fixed creating convertible shaders in the Corona Node Material Editor.

  • Fixed issue where animating a camera could lead to wrongly positioned decals when using IR or Vantage animation rendering

  • Fixed crash on termination when a scene with a Volume Grid in point cloud mode had been loaded during the application run.

  • Fixed ramp in Toon material in older versions of Cinema 4D (R17-R19).

  • Fixes when starting a render from the Corona VFB:

    • Fixed wrong output color space of image saved with automatic saving after render when OCIO is enabled

    • Fixed issue with extra black frame appearing in Picture Viewer when starting animation render from VFB

    • Fixed issue with after-render changes to post processing changing frame number in Picture Viewer

    • Picture viewer did not show render as saved based on configuration

    • Fixed several inconsistencies when numbering frames in Picture Viewer for animation renders and improved support for custom frame selection and for cases with different document/save FPS configuration



3DS MAX

User-Facing Improvements

  • Added support for 3ds Max 2027.

  • Rewritten into Qt:

    • CoronaLegacyMtl

    • CoronaLightMtl

    • CoronaSkinMtl

    • CoronaFabricMtl

    • CoronaRaySwitchMtl

    • CoronaOutlineMtl

    • CoronaSelectMtl

    • CoronaScannedMtl

    • CoronaToonMtl

    • Corona Proxy

    • Corona Light

  • Added functions for loading and saving LightMix settings to the MAXScript API.

  • Added frame info into the CoronaMax log.

  • Added support for tyFlow volumes.

  • Speedup for OCIO color space transforms.

  • Various small improvements to the Corona Toon Material gradient UI control.

  • Optimized light viewport performance. This makes scene navigation with many lights much more responsive - in a scene with 5000 sphere lights 4x fps increase is observed (3fps vs 14fps).

  • 3ds Max Search Menu (keyboard shortcut “X”): added options for Power Tools, Corona Volume Grid, Corona Gaussian Splats, Modifiers, etc.

  • Added the current path to the Gaussian Splat UI.

  • Added option to enable/disable fixed shadows from clouds. When enabled, the shadows are more accurate but stay fixed with the camera position, when disabled their position is not dependent on the camera.

  • Added ACES OT default setting based on color mapping setting. ACES OT is off by default for newly created scenes with OCIO.

  • Added an option to select the UVW channel for the Fabric material.

  • Changed the Normal Filtering default to “Linear”.

  • Now shows the text “No file loaded” when the file path for a Gaussian Splat is empty.

Bug Fixes

  • Fixed glitches in the 3ds Max viewport when using a Corona Light with the latest version of Ornatrix.

  • Fixed Vantage animation render not starting until the 3ds Max timeline slider is moved.

  • Fixed issue where 3ds Max would randomly crash when adding render elements and resetting the scene afterwards.

  • Fixed issue where the Cosmos browser and the Collaboration Tab were crashing in Max 2027.

  • Fixed saving of EXRs with special characters in the path (Save menu in the VFB and saveAllElements in the MAXScript API). This requires short paths enabled on the drive.

  • Improved image saving error message for Save for AI

  • The target noise value and pass limit are no longer changed in the VFB Stats tab even if changed mid-render in the Render Settings dialog (since changing them mid-render does not affect the already in-progress render).

  • Fixed wrong default values in LayeredMtl layers and Map amount parameters in materials rewritten to Qt.

  • Fixed issue where an outline could disappear when its base material was used elsewhere as a sub-material in a MultiMaterial.

  • Minor rewording in warnings about AI denoising and High Quality Filtering.

  • Fixed issue where AI denoising warning message was sometimes displayed in IR even when AI denoising was disabled.

  • Fixed issue where saving an EXR from the VFB results in empty render elements.

  • Fixed issue where saving render elements in EXR might end up having other render elements added in it.

  • Fixed issue where getLastRenderedImage() was empty.

  • Fixed issue where Anima models would get distorted in IR when changing time.

  • Fixed issue where rendering a Render Element for a second time could lead to the render element not being saved to disk.

  • Fixed the CoronaSun unexpectedly having Old (pre-v14) shadows checkbox enabled after saving scene with Corona 14.

  • Open/Save dialogs in the VFB and 3dsMax now block other UI and cannot be re-opened/duplicated.

  • Fixed an issue where changing transformation settings failed to trigger an IR update.

  • Fixed an issue where Include/Exclude areas failed to correctly filter instances on specific mesh topologies.

  • Fixed an issue where camera clipping was applied incorrectly during batch rendering.

  • Fixed issue where a Moon’s parameters controlled from the daylight settings didn’t update during animation.

  • Fixed Include/Exclude (+) button’s right-click menu always displaying “Switch to exclude mode” regardless of the state.

  • Fixed camera sharpening override ignoring animation for sharpening amount, sharpening radius and blurring radius.

  • Fixed HairMtl’s Hair tint texmap using wrong map amount in the viewport.

  • Changed triplanar mapping to absolute from relative.

  • Fixed issue where Fabric sheen layer was incorrectly shaded.

  • Fixed issue where render elements with EXR format would be saved even though they are already included in the beauty EXR file.

  • TyFlow: Speedup for GI and added attenuation that ensures alpha for fire only volumes.

  • Fix for the Color Picker not updating IR for gradient keys.

  • Fixed crash in the Object Replacer which could sometimes occur during preview.

  • Fixed the Cosmos window having minimum size with just the title bar.

  • Fixed issue when converting Front/Back materials with Self-Illumination textures.

  • IFL textures (image sequence) are now correctly exported to Vantage.

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