World Light Extraction #68478

New Issue

Clément Foucault · 2019-08-09T17:23:47+02:00

Clément Foucault commented

2019-08-09 17:23:47 +02:00

Eevee world probe is not suited for very high frequency details and even less for sunlight. For this we want to introduce a threshold. All light under the threshold would be pushed to the world diffuse/reflection probe. All light above the threshold would be moved to an importance sample map and used to position a (virtual) sun light that represent the missing energy from the probe.

We can position the sun in 2 ways: randomly per sample using the importance map, or fixed using a Spherical harmonic decomposition.
The first one offers more precise lighting (can work with multiple light source) when the second one offers more stable lighting (good for a sun).

The good thing is that this virtual sunlight can be shadowed! Thus making most of the light coming from the environment shadowed.

This should fix this sort discrepancy between cycles and eevee:

Estimate : 2 weeks

Eevee world probe is not suited for very high frequency details and even less for sunlight. For this we want to introduce a threshold. All light under the threshold would be pushed to the world diffuse/reflection probe. All light above the threshold would be moved to an importance sample map and used to position a (virtual) sun light that represent the missing energy from the probe. We can position the sun in 2 ways: randomly per sample using the importance map, or fixed using a Spherical harmonic decomposition. The first one offers more precise lighting (can work with multiple light source) when the second one offers more stable lighting (good for a sun). The good thing is that this virtual sunlight can be shadowed! Thus making most of the light coming from the environment shadowed. This should fix this sort discrepancy between cycles and eevee: ![Clipboard.png](https://archive.blender.org/developer/F7656290/Clipboard.png) Estimate : 2 weeks

Clément Foucault commented

2019-08-09 17:23:47 +02:00

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zebus3d commented

2019-08-10 01:15:10 +02:00

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Carlo Ramirez commented

2019-08-12 16:38:56 +02:00

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T.R.O. Nunes commented

2019-08-16 02:23:30 +02:00

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Julien Leménicier commented

2019-09-13 10:55:22 +02:00

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Clément Foucault commented

2019-09-13 18:04:43 +02:00

I did some exploration of the idea. (see P1099)

(This in WIP a lot of things are not working correctly, mainly light intensity)

It seems promising but doing it on CPU accurately is not feasible in an interactive manner.
So final implementation should be done on GPU.

I did some exploration of the idea. (see [P1099](https://archive.blender.org/developer/P1099.txt)) (This in WIP a lot of things are not working correctly, mainly light intensity) ![Capture d’écran du 2019-09-12 15-20-31.png](https://archive.blender.org/developer/F7745502/Capture_d_écran_du_2019-09-12_15-20-31.png) ![Capture d’écran du 2019-09-13 18-02-35.png](https://archive.blender.org/developer/F7745503/Capture_d_écran_du_2019-09-13_18-02-35.png) It seems promising but doing it on CPU accurately is not feasible in an interactive manner. So final implementation should be done on GPU.

Eric Klein commented

2019-09-18 16:30:14 +02:00

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Tibor Horvath commented

2019-10-08 14:40:55 +02:00

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2019-10-18 00:17:22 +02:00

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2019-10-26 20:29:01 +02:00

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Bent Hillerkus commented

2019-12-02 03:00:39 +01:00

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Robert Zhang commented

2020-01-20 05:16:54 +01:00

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Amad Muhammad commented

2020-02-15 16:56:59 +01:00

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2020-03-05 13:01:11 +01:00

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2020-04-11 22:21:05 +02:00

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Daniel Grauer commented

2020-04-15 00:46:30 +02:00

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yangshuzhan commented

2020-05-17 18:14:54 +02:00

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yangshuzhan commented

2020-05-17 18:14:54 +02:00

eevee,metalness0,roughness1

eevee,metalness1,roughness1

cycles,metalness0,roughness1

I think the main problem is the inconsistency of the three circumstances. In theory, the three situations should look the same. You don't need to sample multiple light sources, instead just calculate a metalness-roughness illumination model. The light intensity at the same normal should be approximately the same. I hope I clearly expressed what I mean.

![eevee1.png](https://archive.blender.org/developer/F8540175/eevee1.png) eevee,metalness0,roughness1 ![eevee2.png](https://archive.blender.org/developer/F8540174/eevee2.png) eevee,metalness1,roughness1 ![cycles1.png](https://archive.blender.org/developer/F8540173/cycles1.png) cycles,metalness0,roughness1 I think the main problem is the inconsistency of the three circumstances. In theory, the three situations should look the same. You don't need to sample multiple light sources, instead just calculate a metalness-roughness illumination model. The light intensity at the same normal should be approximately the same. I hope I clearly expressed what I mean.

John Shoemaker commented

2020-06-29 06:45:17 +02:00

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Braden Currah commented

2020-07-07 08:48:23 +02:00

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Kenzie commented

2020-07-18 20:51:35 +02:00

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Zijun Zhou commented

2020-09-05 22:32:41 +02:00

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Mindinsomnia commented

2020-10-27 02:04:29 +01:00

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Mindinsomnia commented

2020-10-27 02:04:29 +01:00

Absolutely love this concept, it would optimise a lot of workflow and bring Eevee and Cycles closer to each other which is always a nice thing since it further enables the goal of allowing real time lookdev in the viewport in Eevee and switching to Cycles for a final render without fiddly changes for each render engine.

Macc commented

2020-12-25 03:37:48 +01:00

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Macc commented

2020-12-25 03:37:48 +01:00

This is great. I really want thisss. I love Eveee, I really wish Evee to be better like this HDRI shadows
and maybe hybrid rendering by using evee passes and shadow reflection and indirect light passes and making renders faster :(

I hope this feature project doesnt stop or forgotten :((

This is great. I really want thisss. I love Eveee, I really wish Evee to be better like this HDRI shadows and maybe hybrid rendering by using evee passes and shadow reflection and indirect light passes and making renders faster :( I hope this feature project doesnt stop or forgotten :((

Aurelien Vaillant commented

2021-03-03 11:55:57 +01:00

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