Fake directional light from environment.dds?

Questions
1

Hi! I am wondering how would one create a fake sunlight directional light from the most luminous highlight of .dds envinment texture used in IBL lighting? I am happy with the IBL results but would need the “fake” sunlight with shadows as well to the scene.

2

Here is the example - https://playground.babylonjs.com/#SYQW69#832
You may need to tune the position and direction of your light to correspond with the most luminous area (and/or tune dds texture rotationY value).

3

Thanks! This gives a good direction for the solution… Btw. now when testing the animating light I started getting interested in calculating the light position based on time and gps-location…

4

Still what I am also kind of missing, is if there is a way to read the env map somehow to get the most luminous spot automatically?

5

Have to try this at some point :wink:

6

In order to find most the luminous spot of the texture you may try to use readPixels Texture | Babylon.js Documentation

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7

There’s currently no tool that would compute the direction of max light in an environment map. That’s something that you will have to write yourself.

8

This post was finally very helpfull here, its what I ended up doing for now:

Boils down to something very simple:

scene.onPointerDown = function(evt, pickInfo) {
console.log(pickInfo.pickedPoint)
}

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9

There is a lot of extremely interesting reading about this here - Path-tracing in BabylonJS - #100 by erichlof

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