Corona Alpha6 is out!


The long awaited Corona Renderer Alpha 6 is out. If you didn’t download it yet, get it now on the forum!

It has been 9 long months since we released A5, and  we’ve come a long way since that. Numerous things were changed and improved. This article should give you a short brief about those changes we did in A6 and tell you something about our future plans.
So read on.



  • Yes, it is still free for commercial use
  • No limitations, no watermarks
  • Offers Biased and Unbiased Rendering
  • By default very slightly biased
  • CPU based
  • Fully integrated into 3dsmax, standalone A6 version will follow
  • 20k+ downloads for A5
  • ADD + NBP – Artist Driven Development & No Bullshit Policy



Distributed Rendering

A pilot implementation of distributed rendering was added. While currently still having some limitations, it can be already used to speed up your still shots.


New Robust API

  • Robust API created, which is already being used to develop Corona for Autodesk Maya and Cinema 4D, with other applications planned


  • Announcement to all developers: If you are interested in some sort of cooperation, do not hesitate to contact us!


Save/Resume Rendering

Yes, with Corona Renderer A6 you are able to save and resume rendering later. Also you are able to save your render and continue rendering on a different machine.

In the future we will also release a utility which will allow you to MERGE two (or more) renders rendered on two different machines (they do not have to part of the same network, so it can be your machine at work and your machine at home).
Resulted merged image will have the noise reduced (simply put: if you used two identical machines, result will twice better)

Improved light solver

Dramatically improved light sampling in some more complicated scenes, where geometry lights and CoronaLights are combined.

Corona Renderer New Light Sampler

Fast motion blur

Non-rigid motion blur is now faster. MUCH faster!

Corona Renderer Non-Rigid Blur

Physically based camera & exposure & emission

Added photographic parameters to the camera, physical exposure, and physical light emission units.

Corona Renderer Actions Dialogcorona_render_camera_dialogemission-units


Rayswitch material & texture

Rayswitch material and texture added, allowing entirely new artistic tweaks in Corona renders. Use it to create materials invisible directly from camera or not affecting GI, reduce or increase color bleeding, and more.

Corona Renderer Rayswitch

Support for 3dsmax standard/photometric lights

While the standard 3dsmax lights are nowhere as physically plausible as CoronaLights, we understand that some users like them for their unprecedented artistic control ability. That’s why we are bringing them to Corona.

Corona Renderer 3dsmax standard lights

Internal Color Space is now WIDE RGB


Corona Renderer was previously using the XYZ color space, as opposed to the sRGB color space used by most renderers.  There are several reasons why using wide-gamut color space improves rendering, even though the final rendered image is converted back to sRGB.

The most important is that input material colors are interpreted differently, in much more plausible way. We all know using pure white (RGB 255 255 255) or pure black (RGB 0 0 0) colors is bad (one makes the render times skyrocket, other creates “black holes” in the image. No real object is totally white or black). An sRGB renderer actually faces these same problems every time a color with either 0 or 255 in red, green, or blue is used (for example, pure red, RGB 255 0 0). This means that using such materials will increase render times, and can also create entirely black objects when differently colored light is used.

When using wide gamut color spaces, all color components are converted to not so extreme values internally. This “magic trick” causes the result to look identical under normal, white-ish lighting, but much more plausible when colored lighting is involved.

A secondary effect is that certain phenomena, like low kelvin temperature emission, or physical sun/sky models at sunset, that are out of sRGB gamut, can be easily simulated with wide gamut spaces.

Although the XYZ color space gave good results according to our empirical testing, using it was not theoretically correct, because the color space is not closed under multiplication (meaning it can produce non-existent colors). That’s why we have decided to switch to Wide gamut RGB, which does the job equally as well, is theoretically correct, and slightly more predictable.

Look at the examples below:colorspace

All clear? Let’s move on.

Support of third-party plugins

Corona Renderer A6 does support the following plugins:



Main Settings UI

The GUI was improved, cleaned up, some options were renamed/reworked to be easier to use.



  • Added tooltips for the key parameters, activated automatically when you hover over the controls. They replace the previous online manual that was not updated since Alpha v4 and remove the need to switch out of the application to look into manual.


  • Inactive parameters are now automatically disabled in the GUI




  • Emission was moved from CoronaMtl to the new CoronaLightMtl.
  • Self-illumination was added to CoronaMtl.



Render Elements Reworked

  • Similar ones were grouped together.
  • There is now a canonical way to compose the final render from elemental passes: by adding up all CESSENTIAL passes.



  • Added albedo render element, showing total material reflectivity. It can be used to quickly check if a scene doesn’t have too bright materials, which would cause excessive render times:


  • Cylindrical/disk and targeted Corona Lights


  • Added include/exclude option for Corona AO:


  • Option to include/exclude individual objects from illumination for each light
  • Scenes now render fast with arbitrary portals polycount
  • Inteligent masking – “Render Masks Only” button (non shading render elements only)
  • Renderstamp now supports more fields: computer name, frame number, and more.
  • Support for XRef scene


Major Bugs Fixed:

  • Fixed issues with Multiscatter, Forest pack randomly not working
  • Fixed crashes of Corona VFB with some resolutions
  • Fixed extremely slow rendering in some scenes
  • Fixed crashes when using HSDS modifier
  • Fixed problems with texture filtering inconsistency
  • Fixed shadows artifacts when using transparent objects
  • Attenuation now works correctly with glass without caustics
  • Fixed occasional jagged edges behind glass and camera motion jerks


I am pretty sure that we forgot on some things, but you are welcome to ask us here,
on our forum, or on facebook. Now that you know what cool features are included in Corona Alpha v6, get it here after registering.

Adam & Ondra

53 thoughts on “Corona Alpha6 is out!

  1. The attitude to your work you guys have is just incredible. Doing something that you like, and providing us with outstanding, excellent, high quality product and all that for free…I really really appreciate that! Thank you for your hard work!


      1. WoW this is amazing….there are milions and milions of sketchup users with the need for a renderer like this for sketchup 😉

  2. Pingback: Corona V6
  3. Thank you!
    I’ll now switch for sure, as there is almost no need to change workflow from another renderer.
    Great progress, I wish you success!

  4. I want to thank you CORONA Team. It’a amazing piece of software, and amazing power of this tool. You’ve done amazing job, probably you didn’t sleep many night and days…
    We are wating for commercial version in future – we have to pay for Your hard job Sir 🙂
    Kind regards

  5. Thanks for the new Alpha. Distribuited render, very very good implementation.

    We have some day the chance of have Corona in GPU rendering??? or both working together???? for example one making the AO and lights calculations and other the rest of things??? I don’t know nothing of programming only work with max, but i’m remembering, long long time ago we had a very expensive hardware only to do the raytracing in max.

    1. this is not planned, because according to our research it would not pay off. You either get no speedup, or you get the GPU limitations like no support for 3rd party texmaps and limited gpu RAM.

  6. Thank you so much!!! Been using Corona (exclusively) for about a year now. Prior a fan of v-ray for 10 years… Corona is by far the most user friendly profesional render engine out there (freelancer arch-viz). The simplicity and high performance amazes me every time I use it. U have made my life so much easier!!

    Trying out the new version on a new project…feels fresh:))

    Greetings from Slovenia.

  7. This is incredible, I can’t wait to test it on my current project!

    btw it would be great to have Corona renderer also for Cinema 4D…

    Cheers guys!

  8. So excited right now!! Nice large steps, great work guys. You make the industry exciting!

    Noticed Haggi has been going hard as well with the Maya integration. We’re probably not too far from seeing that either!


  9. aun no entiendo porque mi imagen queda como borrosa, ¿como hago para que quede una imagen bien?

  10. I am Brazilian and would like to try this program, but I can not download, is not working the anti-bot verification.

  11. dobry den, hi guys, this thing looks amazing, does it also run stand-alone, like, say Maxwell studio, or do I need 3ds max to run it? will you develop it for Softimage too?
    Thanks guys keep up with the good work.


  12. Hi!
    I read what free standalone A6 version of Corona Render will follow. I’d like to try to use it, so when I’ll can download it.
    and can you tell more about: “But there is an exporter from blender”

    1. Hi, sorry, but you cannot. The supported versions are 2011-2015. I would recommend checking out the 45-day demo of Corona 1.5.2 instead. 🙂

  13. Право же я только начинаю постигать данную область знаний ,но она меня уже впечатляет

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