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Implement distance fade and transparency #54222

Merged
merged 2 commits into from
Oct 28, 2021
Merged

Implement distance fade and transparency #54222

merged 2 commits into from
Oct 28, 2021

Commits on Oct 25, 2021

  1. Fix state inconsistencies in visibility dependencies.

    @JFonS
    JFonS committed Oct 25, 2021
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  2. Implement distance fade and transparency 

    The built-in ALPHA in spatial shaders comes pre-set with a per-instance
transparency value. Multiply by it if you want to keep it.

The transparency value of any given GeometryInstance3D is affected by:
   - Its new "transparency" property.
   - Its own visiblity range when the new "visibility_range_fade_mode"
     property is set to "Self".
   - Its parent visibility range when the parent's fade mode is
     set to "Dependencies".

The "Self" mode will fade-out the instance when reaching the visibility
range limits, while the "Dependencies" mode will fade-in its
dependencies.

Per-instance transparency is only implemented in the forward clustered
renderer, support for mobile should be added in the future.

Co-authored-by: reduz <reduzio@gmail.com>
    @JFonS @reduz
    JFonS and reduz committed Oct 25, 2021
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