Bloom effect inverts when radius > 1

[jacobsantos2001]

Description

When the bloom radius > 1, the effect starts to "invert". See below:

radius = 0.66:

radius = 1.52:

radius = 5:

Is this intended behavior? Should the radius be clamped between 0 and 1?

Reproduction steps

1. Edit the radius slider on any bloom example like unreal bloom to accept values larger than 1
2. Move the radius slider > 1 and observe the invert

Code

The lerpBloomFactor in the frag shader in UnrealBloomPass.js can produce negative values when bloomRadius is > 1

three.js/examples/jsm/postprocessing/UnrealBloomPass.js

Lines 473 to 476 in 7a4f6b6

	float lerpBloomFactor(const in float factor) {
	float mirrorFactor = 1.2 - factor;
	return mix(factor, mirrorFactor, bloomRadius);
	}

For a repro, see below jsfiddle.

Live example

• bloom jsfiddle

Screenshots

See above

Version

latest

Device

No response

Browser

No response

OS

No response

[Mugen87]

The radius property must be indeed in the range [0,1]. That's why the UI sliders are in the same range.

I'll update the docs to make this clear.