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manual/render/eevee/screen_space_effects/introduction.rst

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Eevee is not a ray tracing engine and cannot do ray-triangle intersection. Eevee is not a ray tracing engine and cannot do ray-triangle intersection.
Instead of this, Eevee uses the depth buffer as an approximated scene representation. Instead, Eevee uses the depth buffer as an approximated scene representation.
This reduces the complexity of scene scale effects and allows high performances. This reduces the complexity of scene scale effects and allows high performance.
However, only what is in inside the view can be considered when computing these effects. However, only what is in inside the view can be considered when computing these effects.
Also, since it only use one layer of depth, only the frontmost pixel distance is known. Also, since it only use one layer of depth, only the frontmost pixel distance is known.
These limitations creates a few problems: These limitations create a few problems:
- The screen space effects disappear when reaching the screen border. - The screen space effects disappear when reaching the screen border.
This can be partially fixed by using the *overscan* feature. This can be partially fixed by using the *overscan* feature.
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- The screen space effects don't know how deep (or thick) the objects are. - The screen space effects don't know how deep (or thick) the objects are.
This is why most effects have a thickness parameter to control how to consider potential intersected pixels. This is why most effects have a thickness parameter to control how to consider potential intersected pixels.
- Blended surfaces are not considered by these effects. - Blended surfaces are not considered by these effects.
They are not part of the depth prepass and does not appear in the depth buffer. They are not part of the depth prepass and do not appear in the depth buffer.
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