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Merge pull request #7311 from Calinou/spatial-material-refraction-limitations-3.6

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Max Hilbrunner
2023-05-08 22:57:20 +02:00
committed by GitHub
parent 597f0d3a38 6a3bdf6d9f
commit d1d62fc68d
2 changed files with 24 additions and 1 deletions
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2
about/list_of_features.rst
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@@ -181,7 +181,7 @@ Editor
- Dithering can be determined on a per-pixel or per-object basis.
- *GLES3:* Parallax/relief mapping with automatic level of detail based on distance.
- *GLES3:* Sub-surface scattering and transmittance.
- *GLES3:* Refraction with support for material roughness (resulting in blurry refraction).
- *GLES3:* Screen-space refraction with support for material roughness (resulting in blurry refraction).
On GLES2, refraction is still functional but lacks support for material roughness.
- *GLES3:* Proximity fade (soft particles).

23
tutorials/3d/spatial_material.rst
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@@ -484,8 +484,31 @@ When refraction is enabled, it supersedes alpha blending, and Godot attempts to
fetch information from behind the object being rendered instead. This allows
distorting the transparency in a way similar to refraction in real life.
Remember to use a transparent albedo texture (or reduce the albedo color's alpha
channel) to make refraction visible, as refraction relies on transparency to
have a visible effect.
A normal map can optionally be specified in the **Refraction Texture** property
to allow distorting the refraction's direction on a per-pixel basis.
.. image:: img/spatial_material23.png
.. note::
Refraction is implemented as a screen-space effect and forces the material
to be transparent. This makes the effect relatively fast, but this results
in some limitations:
- :ref:`Transparency sorting <doc_3d_rendering_limitations_transparency_sorting>`
issues may occur.
- The refractive material cannot refract onto itself, or onto other
transparent materials. A refractive material behind another transparent
material will be invisible.
- Off-screen objects cannot appear in the refraction. This is most
noticeable with high refraction strength values.
- Opaque materials in front of the refractive material will appear to have
"refracted" edges, even though they shouldn't.
Detail
~~~~~~