How to get negative distortion (LensRenderingPipeline) or concavity

[hit2501]

Hi, I'm using:

var lensEffect = new BABYLON.LensRenderingPipeline('lens', {
            distortion: 0.5
}, scene, 1.0, camera);

scene.registerBeforeRender(function() {   
            lensEffect.setEdgeDistortion(some_value);
});  

To distort the view dinamically but this only gives me a convex view, I tried to use negative values in "distortion" to get a concave view but didnt work.

How can achieve it?

Thank you all.

[GameMonetize]

Hey this is expected:

https://github.com/BabylonJS/Babylon.js/blob/dea49de07ac07a2bf7896aaa0e13c26e0f674c9e/src/Shaders/depthOfField.fragment.fx#L62

The distorsion is clamped between 0 and 1

[hit2501]

Thank you Deltakosh, I saw that your sample is in c (or c++), but I must ask you to be incredibly patient because I'm an incredible noob learning to handle webgl but through Babylon. I dont know how to apply your sample because I dont know C (or C++), its a shame I know  

[GameMonetize]

it is not C (or C++) but a shader. Written in GLSL which looks like C (but for GPU).

There is no problem if you don't know how to change it  What I tried to mention in my previous response was exactly this point: It is NOT easy to change

[hit2501]

Understood, in that case, can you suggest me other possible action to get a similar concavity effect?

Thanks again DK.

[GameMonetize]

Can you provide me an image or various images that showcase what you want to achieve?

[hit2501]

Yes, in the first one you can see the view without distortion, the second shows the convex distortion and the third one shows the effect (red lines) of what Im looking for but dont work:

[GameMonetize]

So you can try to compile your own version of babylon.js with the updated shader

Just change this line:

https://github.com/BabylonJS/Babylon.js/blob/dea49de07ac07a2bf7896aaa0e13c26e0f674c9e/src/Shaders/depthOfField.fragment.fx#L62

to this:

float dist_amount = clamp(distortion*0.23, -1.0, 1.0);