Skylight Portals

Corona Corona for 3ds Max Requests
1

I did some quick tests of interiors and it appears that the difference (noise/rendering time) between using environment light only vs Corona planar lights on openings is quite significant.

So the question, are skylight portals on your to do list ?

3

I guess I don’t need to tell which one is which.

I would not call that a minor difference.

How is using PT as second solver a nonsense ?

Gonna try Hd cache, thanks for the tip.

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7

ehm… the scenes are quite different. The smaller the windows are, the better using lights/portals in them becomes.

Anyways, portals will be implemented eventually, as an optional way to speed up rendering of interiors with small windows

8

Ok I just tested HD cache, much faster indeed.

HD cache GI is as accurate as PT in any situation ?

11

I guess it makes more difference with PT.

I was using PT because I was concerned with blotches indeed but so far HD cache looks good.

13

Portal lights will be useful once Irradiance cache is up and running :smiley:

14

ummmm… no :wink: They will be exactly as useful in both PT and IC. There is no magical reason that PT wouldnt need them. Maybe its just that the unbiased renderers are better at brute-forcing it without the portals.

15

In unbiased rendering a window (hole in the wall) works like a light portal, am I right? Adding extra light portal would be like adding additional data which could even make the rendering longer?

16

It would allow better importance sampling of the environment map (for direct lighting/shadow rays). And it works the same in biased and unbiased.

17

Hi , i did a test with corona light at the window and without and the diference i so huge.

skylightonly.jpg
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coronalight_window.jpg
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19

Someone should make an obligatory FAQ for new users. :smiley:

20

Have you increased light sampling multiplier and PT samples in case of using environment?

yes i dead 10 for ligh sampling and pt sample in HD 4000 , and 64 for pt sample , even i play with all settings , light coroan is much faster than skylight and light material

21

Implemented as an OPTIONAL way to speed up rendering. Still need some work though

22

Mega!

23

I have so far only tested positive Portals.
Cache calculated longer, but eventually for the same time, the result is much cleaner noise.
I’m testing on.

24

Just tested skyportals in a small windows configuration. Both images have 20 passes and the image with portals is much cleaner with few seconds more of calculations.
PT+PT 16 samples

bunker_20p_comparison0001.jpg
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25

Great !

26

I feel a bit stupid right now but… how/where the hell do I activate the light portals O_o ? (latest daily build of course)

27

a new material

28

Use material CoronaPortalMtl for planes in the windows