Topic: [Awaiting reply] Lumion Rendering Video takes days??

[bryan]

Hi,

I have the Lumion Pro 7.0 (7 day trial) and the software is really amazing. The rendered images from lumion are fascinating  however when I try to save a movie/video from with the highest quality, it seems that the rendering would take more than 200+ hours which is pretty insane. We just got our graphics card upgraded to NIVIDIA Geforce GTX 1070 and I've attached a snapshot of the estimated rendering time along with the benchmark results. The movie is just a walk through of a unit in a condo and its only over a minute long. I dont know if this is normal for lumion to take this long to render videos or is there way to lower the rendering time in Lumion and still get the best quality you can get. Hope to hear from you guys soon. Thanks   

[Morten]

Hi Bryan, welcome to the Lumion Support Center.

Your benchmark results look fine, and the GTX 1070 is a good choice for Lumion.

I can see that your movie resolution is set to 2560x1440 and 5-star quality. This sort of resolution obviously take significantly longer than say, a 1280x720 movie. However, you need to wait for it to complete, say, 5 frames, before the estimate becomes more accurate.

If it's still 100+ seconds per frame after waiting for a little while, please click here and go through the checklist to see if any of the "usual suspects" apply to your scene (in particular E, F and G).

If you haven't used an excessive number of those elements, I'd be grateful if you could please click here and follow the instructions in order to upload the scene file in LS7 format, so we can take a look.

Thanks in advance!

[Morten]

P.S. Please don't forget to register your Trial license, so that we can move this thread to the full forum (which is hidden until you register a license).

[bryan]

Thanks for all the help Morten, I will give it a shot again with all the modification needed and see the results. Awesome thanks.


Also I tried registering but it wont let me and when I try to put my license key, it says that "The license does not exist, is not valid or is already registered to this account. Please check the license and try again. Educational licenses cannot be registered" and I used the License key that was sent to me through email. Can I still register even though I have the 7 day trial version?

[Morten]

Yes, that should still be possible - unless my colleagues have made a change that I don't know about.

Please forward the license number to [email protected], so we can take a look. Thanks!

[Morten]

Thanks for forwarding the license number. My colleague Peter has sent you instructions on how to extend your Trial period.

Now, regarding the render issue, we've had a look at your scene.

SCENE STATISTICS
The scene in Build mode consists of about 3.7 million 3D points (calculated in 4 star quality).

It contains 4 reflection planes in the Reflection effect, and 5 Spotlights are assigned to the Global Illumination effect.

When you render a clip in 5-star quality, Lumion renders the scene 16 times in 16 sub-frames that are blended as a single frame.

1) Each Spotlight that is assigned to the Global Illumination effect means that the entire scene has to be rendered once more per frame. As there's 5 of those, it means the scene has to be rendered 5 times extra per frame.

2) Every time a reflection plane is added in the Reflection effect, the entire scene has to be rendered once more (if there are Spotlights assigned to the Global Illumination effect they also have to be mirrored which will double the impact).

RENDER LOAD
The result is that if there are 5 Spotlights assigned to the Global Illumination effect, and 4 reflection planes you end up with the following 3D Points that have to be rendered every frame:

3.7 million 3D Points x (5 Spotlights + 4 reflection planes + 4 reflection planes x 5 Spotlights) x 16 sub-frames = 1.7 billion 3D Points per frame

That's a lot of 3D Points, even for a GTX 1070.

In addition, you're also rendering the video in 2560x1440 which means that 3,686,400 pixels have to be calculated 464 times per frame.

You've also turned on Super resolution shadows and SpeedRay Reflections which add to the total render time (but not much).

And lastly, the clip is 2:21 long, so depending on your "Frames per second" setting it may take a very long time to complete it (200 FPS will take 4 times as long as 25 FPS for example).

RESULTS BASED ON A GTX 760

• If I turn off all of the Movie effects, it takes about 12 seconds per frame to render a 1920x1080 movie.
• If I switch to 2560x1440 it takes 22 seconds per frame.
• If I then switch on all effects apart from the Reflection effect it takes 28 seconds per frame.
• If I also switch on the Reflection effect, it takes 122 seconds per frame.

CONCLUSION
As you can see, it's a cumulative penalty on renderings that's resulting in longer render times - depending on what sort of bells and whistles you want.

RECOMMENDATION
In summary, you should consider reducing one or more of the factors above if you want to reduce the total render time.

Let us know if we can help you with anything else.