Lights - render times...

The Twilight Render Team shares tips, ideas, helpful hints, and more on using Twilight Render
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Frederik
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Lights - render times...

Post by Frederik » Thu Oct 01, 2009 6:29 pm

Hi All,
Edit by Admin: (for another quick light render time visual comparison, see this Color of Lights / Light Render Speed Comparison.
Some of you might already have seen the tip I gave in Fred's Kitchen "Contest" thread regarding how to make spotlight components and how much it will impact on the render time...

I made some tests, which you can easily reproduce yourself... ;)

In the first image, I've placed a point-light inside the can and an IES just below...
This is by far the fastest render time... (14 minutes using preset #5...)
Test-Point-IES-14m.jpg
Test-Point-IES-14m.jpg (140.13 KiB) Viewed 16004 times
Then I placed a square shaped mesh and applied an Emitter material...
As you can see the render time is almost twice the time... (26 minutes using preset #5...)
Test-SquareEmit-IES-26m.jpg
Test-SquareEmit-IES-26m.jpg (126.95 KiB) Viewed 16000 times
I then made a circular shape and applied an Emitter material, similar to the square, but already 22 minutes in the render, it had only rendered 30%... :shock:
So I just gave up and terminated that one... (30% done after 22 minutes using preset #5...)
Test-CircleEmit-IES-22m.jpg
Test-CircleEmit-IES-22m.jpg (142.7 KiB) Viewed 15999 times
So placing a point-light inside the spotlight-can will make it render A LOT faster... And IMO it also looks the best... ;)

You can try yourself by downloading the "skippi'es" >>here<<...
Cheers
Kim Frederik
Twilight Render Support
“…Life is drawing without an eraser...”

Phil Meadows
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Joined: Thu Sep 17, 2009 10:06 am

Re: Lights - render times...

Post by Phil Meadows » Thu Oct 01, 2009 7:18 pm

what about a fake emitter? I'd try it but i'm at work, no Twilight here. Yet.

Thank goodness for the forum :whoot:
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Fletch
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Re: Lights - render times...

Post by Fletch » Thu Oct 01, 2009 7:50 pm

Painting the inside of the can light with a "Fake Emit" type material, and using a single spot below it is definitely faster... 3x faster than the small point in the can and spot below... however, as soon as you try to render the 'fake' emit in a progressive method, it becomes an actually emitting material... so just be aware of that.

from personal past experience: <<edit - see image in post below for more accurate light render time comparison chart>>
If a point light renders in 10s, a spot renders in 5s.
If a spot renders in 5, and you load an IES file into it, it will be more like 15s
If you use a small emissive triangle instead of an IES or spot, it will render about 15-17s
If you use a rectangle instead of the triangle it will render in 20-30s
If you use the IES Mesh Light Emitter :shock: (what?! that even exists in Twilight?!) umm... yes. ;) It will render in about 20s or more (wild guess, I haven't tested that.)

The TWL light components will be out very soon... and there are 3 example cans set to emit light equivalent to different wattages... they have a point and spot as Frederik is showing.

Pg09
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Location: Trinidad

Re: Lights - render times...

Post by Pg09 » Mon Oct 05, 2009 3:11 am

Thanks Frederik and Fletch,
i spent some time with playing with lights today.

Also i think you should put these tricks and tips (not just this one) in the "very handy "Reference" section" of the Manual :) because here they might not get enough attention if the topics sink....
Cheers,

Adam

Frederik
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Re: Lights - render times...

Post by Frederik » Mon Oct 05, 2009 9:03 am

Thanks, Pg09... ;)
Pg09 wrote:...they might not get enough attention if the topics sink....
We can always make this thread a "Sticky" so that it won't "sink"...
(the problem with "stickies" are that you can end up with a too long list...)
Cheers
Kim Frederik
Twilight Render Support
“…Life is drawing without an eraser...”

Fletch
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Re: Lights - render times...

Post by Fletch » Sun Mar 07, 2010 10:34 pm

Just a "bump" for this thread... edited first topic to add this link:
Color of Lights / Light Render Speed Comparison
Image

anez
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Joined: Thu Jul 01, 2010 8:21 am

Re: Lights - render times...

Post by anez » Thu Jul 01, 2010 8:26 am

I really enjoyed watching the lights, so nice...

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