Corona Renderer 1.4 for 3ds Max released

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We are proud to present to you Corona Renderer 1.4 for Autodesk 3ds Max! This release focuses on significantly reducing your render times (just check the stats that have been reported below) and speeding up your workflow, as well as increasing stability. The team has worked hard on this, and I’d like to thank them for taking Corona to the next level.

Quick Facts

  • Faster: denoising can reduce render times by 50 to 70% (see Recent Spaces’ blog post here).
  • VFB History with A/B comparisons to quickly check results from different lights, materials, render settings, etc.
  • Adaptive image sampling that automatically focuses processing on tricky areas, resulting in even faster rendering.
  • Corona Renderer 1.4 is freely available to all our customers on FairSaaS (monthly, yearly), Box with Subscription and Educational/Student license.
  • Supports Autodesk 3ds Max versions 2011-2017.


Company News

Before you dive into this lengthy blog post, I would like to give you a short company update.

Our team is bigger again – Tom Grimes and Kerry Adams joined our team to help us with marketing and e-commerce related tasks. Tom will not only be handling all our marketing output, but most importantly he will be in close touch with communities to ensure that we know (and do) what our users want. Tom used to work for Caligari Corporation (trueSpace) as a Marketing Specialist until it was acquired by Microsoft in 2009.

Kerry is our external consultant who will help us with e-commerce and functional web re-design. Kerry was (and still is) involved in multiple projects, and the most well-known companies he has worked for (that we can mention) are Avast! and JetBrains.

Corona Academy is also moving forward so you can expect the first sessions later this year. Currently, we are updating all of the materials to reflect the changes introduced in version 1.4.

We are also planning to visit and speak at several conferences around the Europe this year. Here is the list of (semi)-confirmed events for the time being:

  1. 3DS London User Group –  London, 1.6.2016 (presentation)
  2. End User Event 2016 – Utrecht, 16.-17.6.2016 (presentation)
  3. AVD 2016, Gothenburg,  15.9.2016 (presentation)
  4. SOA Academy Day 7 (?), Italy

New Features


The new denoising feature analyzes noise in the 3D space, so is not just a 2D post-process. You can use it to reduce the number of passes needed to get a noise-free image, with render time reductions of 50 to 70% reported to us by third parties in commercial usage (not by arbitrary measuring tools or carefully crafted test scenes!). It will also remove fireflies from an image, and can be used only in that mode if required.

It is seamlessly integrated into the core as one-click solution. The denoising level can be interactively adjusted in the VFB after rendering is complete, so that you are not locked in to the level set in the rendering options. This lets you check and adjust the blending between the regular and the denoised image without having to re-render.

Compare the results below, where both versions of the images were created using the same preset render time.


Adaptive Image Sampling

This balances out the rendering calculations over the image to focus more processing power on tricky areas like shadows, so you don’t find yourself with a clean image but still needing more render passes as you wait for one problem area to clean up.

A note – with the introduction of Adaptive Image Sampling, it is now more useful to use the new Noise Limit for your renders than the old Pass Limit, to ensure consistent quality for every image or frame in the least amount of time.


VFB History and Comparison

You can now save your render to a history buffer, and perform an A / B comparison in the Corona VFB on any two images from that buffer (including region renders). Ideal for speeding up your workflow when comparing settings, materials or lighting.

Corona Renderer - VFB History


Interactive and Multiple Render Regions in the Corona VFB

It’s now easy to add as many render regions as you wish to the Corona VFB, speeding up your workflow when you need to check multiple areas at once in either interactive or regular renders.

You can also move the regions at will in the Interactive renderer mode so that they act as a “sample brush”, letting you paint-in areas which you want to refine faster or inspect at better quality.

Corona Renderer - Render Regions


Efficient Handling of More Than 255 lights

Corona now handles scenes with more than 255 lights without problems and with no penalty to render time.


Texture Baking Added

You can now use the Render To Texture option to bake your textures for exporting your models to real-time applications such as VR or games.

Corona Renderer - Texture Baking


Virtual Reality Camera Added

Enabling this option in the Corona camera modifier will let you render your stereoscopic panoramas in equirectangular format. This is our first implementation of the VR camera and we plan to develop this functionality further as we move forward. Look for an additional announcement regarding VR in the near future in a separate blog post!

Corona Renderer - VR scene by Recent Spaces


Corona Objects Switched to Nitrous in the Viewport

This will speed up viewport performance where there are a lot of Corona objects such as lights, proxies and scatter.

The tests below used a GTX 980 Ti with a Corona Scatter set to display 100% of the 100,000 instances in Wire box Previz mode – note the frame rate shown in each, as 1.4 far exceeds the GIF frame rate!

Corona Renderer - Scatter 1.3

Corona Renderer - Scatter 1.3


Corona Scatter Now Multi-Threaded

This gives a speed up of around 5 times on a typical quad-core i7 when generating instances from Corona Scatter.

Corona Renderer - Scatter Multithreaded


Velocity Render Element Added

This gives you the option to handle some effects better in post-processing –  such as motion blur. The element offers both World and Camera space to match the needs of your post-process tools.

Corona Renderer - Velocity Render Element


Beauty Pass Render Element

A new “Beauty Pass” render element has been added. This is useful if you need to render multiple denoising versions at the same time, which allows you to mask areas in post-processing to give different denoising levels in different areas of the image.

Corona Renderer - Beauty Pass Example 1

Corona Renderer - Beauty Pass Example 2


Smaller Improvements

Interactive Rendering supports render elements

Now you can check any render element in the IR.

3ds Max native normal texture map now supported

This removes the need to convert them to a Corona Normal Map.

Hue randomization added to the Corona Multimap

To allow for a more natural (or more extreme!) result, for example when applying colour to leaves, trees, grass, etc.


Corona Scatter option to show as point clouds in viewport

This will improve viewport performance when working with scenes with scattered high poly objects.

Other Improvements

  • General speed improvements of around 5 – 10%
  • Corona Scatter option to use density rather than absolute instances count
  • Corona Scatter option for manual updates for working with huge scatters in the viewport
  • New sharper image filtering
  • Panning in the Corona VFB is now much faster
  • DR / Network rendering
    • The DR server no longer requires admin UAC elevation, which previously caused problems with missing textures. An error message has been added if the DR server is run with UAC elevation.
    • Network rendering debug render element added
    • DR server is now a 32-bit application for easier deployment (no DLL depencies)
    • Added a ‘–noGui’ option to run the DR server without UI
  • DirectX shader material now supported
  • Fixed some IES lights which produced excessive noise
  • The Interactive Renderer is now immediately refreshed when any parameter in the Common Renderer dialog changes
  • Autosave now saves both tonemapped version and raw version of the render, to allow both easily resuming the render and viewing the final result.
  • Falloff map evaluation now much faster
  • Added MultiMap batch load button
  • Stats panel and Render Stamp number formatting are now properly localized
  • Estimated time left is now printed into the Corona log file
  • .conf files now have human-readable properties for options such as GI solvers and render engines
  • The installer now unpacks both legacy and full versions in “Just unpack” mode
  • VFB smiley rotation direction now different for IR vs non-IR mode 🙂

UI Changes

Removed deprecated HD cache and Bucket renderer

Removed due to increasing incompatibility with new features and improvements.

Miscellaneous UI changes
  • Resuming a render now also loads existing statistics from the file (elapsed time, number of passes)
  • File selection dialogs now prompt when overwriting existing files
  • Added Render Stamp render element (allows saving of CPU, clock speed, passes, etc., at render time)
  • Better default autosave directory
  • All include/exclude lists now show the number of objects included/excluded
  • Clicking on the line between a light and its target now selects both light and target
  • Some error messages are now only displayed once
  • Merged multiple “zero scale object ignored” error messages into one, and re-classified it as a warning
  • Removed Internal Resolution Multiplier (this is replaced with highlights clamping option, and upcoming glare/bloom filters)


Bug Fixes

Using non-zero contrast no longer destroys HDR images

Previously, increasing contrast on an HDR image would cause highlights to get reduced, acting like another layer of highlight compression. This has been corrected.

Viewport display significantly faster when using Scatter with many instances where most of those are hidden

Viewport performance has been significantly increased when using Corona Scatter to create a massive number of instances but with most of those hidden.

The tests below used a GTX 980 Ti with a Corona Scatter set to display 0.1% of 5 million instances – again note the frame rate in each, as Corona 1.4 far exceeds the GIF frame rate.

Corona Renderer - Scatter Hidden 1.3

Corona Renderer - Scatter Hidden 1.4


List of Various Bugfixes:
  • Fixed: Falloff map locks transformation of an object in Interactive mode
  • Fixed: Distance blend mode of falloff map uses world instead of camera origin
  • Fixed: Particle age causing crashes in Interactive mode
  • Fixed: Tooltips would not disappear
  • Fixed: Render Elements missing when using “render selected”
  • Fixed: Background blurring with repeated “render selected” uses when “Clear VFB” was off
  • Fixed: DR freezing during the parsing phase when using a very large number of Corona bitmaps stored on a network drive
  • Fixed: Google Chrome freezing while rendering
  • Corona Bitmap and Corona Sky now work as viewport background
  • Interactive Renderer now properly updates when render selected mode “Viewport Selection” is used and the viewport selection changes
  • 3ds native light types are now properly scattered inside volumetric materials
  • Dramatic improvement to displacement quality in certain situations
  • Corona DR now properly renders frames with negative numbers


List of Minor Bugfixes:
  • Interactive Rendering
    • Fixed: Interactive Rendering not automatically reacting to displacement changes in some cases
    • Fixed: Incorrect zoom when using an orthogonal view + show safe frames + Interactive Rendering + a vertical image
  • DR
    • Fixed: Rare hang-ups of 3ds Max when rendering via Backburner
    • Fixed: Blank DR tab in some situations
    • Decreased logging frequency of messages in network rendering to solve some problems with Deadline
  • Corona Bitmap
    • Fixed: HDR maps sometimes loading incorrectly
    • Fixed: Bump mapping when used in combination with real world scale
    • Fixed: Visible banding when using 16-bit TIFF files
    • Fixed: Viewport representation of a Corona Bitmap gets blurred when using crop mode
    • Fixed: Issues with TGA support
    • Significantly lower memory footprint when using HDR bitmaps and single channel bitmaps
  • Fixed: Scatter “convert to geometry” sometimes produced incorrect results
  • Fixed: Scatter not updating properly in the viewport when scattering on an animation object
  • Fixed: Black spots with extreme motion blur
  • Fixed: Loading of mapping coordinates when legacy cbin proxy format is used
  • Fixed: Incorrect normals loading in Corona Proxy that sometimes happened when using the legacy cmesh format
  • Fixed: Problems with displacement subdivision in ortographic view
  • Fixed: Crash when exporting empty mesh as Corona Proxy
  • Fixed: Memory not being released when render elements were deleted
  • Fixed: Bokeh rotation was shown in radians rather than degrees
  • Material Editor previews no longer get stretched with non-unit pixel aspect ratios in the Global Render Settings
  • Third Party Plugins
    • Fixed: Crash with the Multiscatter plugin and Interactive Rendering
    • Fixed: Forest Pack with Corona Multimap with animated camera and visibility clipped to camera frustum no longer changes color assignment to nodes


And now enough reading and scrolling – time to download the new version from here:


What’s Ahead?

You’ll notice in the write up above that we already have plans for 1.5. Currently, we expect 1.5 to be less revolutionary and more evolutionary, so we anticipate a shorter development cycle for that.

Work hasn’t stopped on the Cinema 4D and SketchUp versions, the programmers assigned to those platforms are still working uninterrupted. We’ll continue to release news of those separately. Of course, the development of the features in this 1.4 release is also relevant for the development of those other platforms, so no need to fear that one is developed at the expense of another!

MacOS and Linux compatibility are also well underway. We will release MacOS version of Corona Benchmark in few days.



Thanks again to everyone involved in Corona Renderer – to our devs, support, forum moderators, translators, beta testers, advisors, partners, resellers,  and our users.

Thank you!

Adam, Ondra, and the Corona Crew

37 thoughts on “Corona Renderer 1.4 for 3ds Max released

  1. The reason I didn’t buy Corona 1.3 was that I tried the demon and had problems rendering an animation when using realflow plugin. It would render the first frame perfect but then the fluid part of the animation would get stuck while the reast of the scene would animate.

  2. you must create another trail option… with big watermark or i dont know its will be better!

  3. Installer doesnt work for me with 2015 design, works for 2016.
    Specified module cant be found!

    Any ideas?

    1. Hi, sorry but not yet. But any information regarding new software support will be surely announced publicly.

  4. Does the De-Noise only work on the final beauty pass? What if you want to comp and control the render elements in post?

  5. Hi,
    I have Corona 1.4 installed in 3ds max 2016. Everytime I use a transparent material with Corona multi-layer material, It changes the IOR (Refraction) of the object at the render time. This is a big bug. Please solve this.

  6. Could not bake the lightmap in corona. I am using 3ds max 2014 and corona 1.4. Everything else is black except beauty and ao

    1. Hi, we already have Corona 1.6 – if you own any subscription-based license (FairSaaS or Box+Sub) I would recommend downloading it, and checking if your issue is solved. If not, please contact us at

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