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Backface Culling hides the back side of faces.
After calculating the color of a surface, the blend mode defines how it is added to the color buffer. Depending on this, the final color will be different.
Alpha Blending is considered a «Transparent» blend mode and has implications regarding screen space effects.
The previous color will be overwritten by the surface color. The alpha component is ignored. This is the fastest option.
- Alpha Clip
The previous color will be overwritten by the surface color, but only if the alpha value is above the Clip Threshold value.
- Alpha Hashed
The previous color will be overwritten by the surface color, but only if the alpha value is above a random clip threshold. This statistical approach is noisy but is able to approximate alpha blending without any sorting problem. Increasing the sample count in the render settings will reduce the resulting noise.
- Alpha Blending
Use alpha blending to overlay the surface color on top of the previous color.
When writing to the color buffer using transparent blend modes, the order in which the color blending happens is important as it can change the final output color. As of now Eevee does not support per-fragment (pixel) sorting or per-triangle sorting. Only per-object sorting is available and is automatically done on all transparent surfaces based on object origin.
Per-object sorting has a performance cost and having thousands of these objects in a scene will greatly degrade performance.
- Show Backface
If enabled, all transparent fragments will be rendered. If disabled, only the front-most surface fragments will be rendered. Disable this option to ensure correct appearance of transparency from any point of view. When using Alpha Blending this option should be disabled because with Alpha Blending, the order in which triangles are sorted is important.
Type of shadows used for a transparent surface. Eevee does not support colored shadow maps.
Half transparent shadows can be produced by using hashed transparent shadows and a larger Soft value on the shadow map.
This option does not change the behavior of contact shadows which are traced using the depth buffer. If the material is writing to the depth buffer (in other words, if the blend mode is set to either Opaque, Alpha Clip or Alpha Hashed), contact shadows will be cast by the surface material regardless of the Transparent Shadow type.
The surface will not cast any shadow.
The surface will cast shadows like an opaque surface.
- Alpha Clip
The surface will cast shadows like an opaque surface, but only areas where the alpha value is above the Clip Threshold value.
- Alpha Hashed
The surface will cast shadows like an opaque surface, but only areas where the alpha value is above a random threshold.
Threshold value for Alpha Clip mode in Blend Mode and Shadow Mode.
Screen Space Refraction
Enabling Screen Space Refraction on a surface means that refraction BSDFs will do a ray trace against the depth buffer to find the most accurate refracted color. This has a big performance cost if the surface covers a lot of pixels.
Screen Space Reflections and Ambient Occlusion are not compatible with Screen Space Refraction. They will be disabled on the surfaces that use it. Surfaces that use Screen Space Refraction will not appear in Screen Space Reflections at the right place. Surfaces that use Screen Space Refraction will not cast Ambient Occlusion onto other surfaces.
If this option is disabled or if the Screen Space Refraction ray tracing fails, the refracted ray will use the color of the nearest probe.
- Screen Space Refraction
Enables screen space refraction.
- Refraction Depth
If Refraction Depth is not 0.0, all refraction BSDFs in the shader will act as if the object is a thin slab of the refraction material having this thickness. This will model a second refraction event that will double the absorption color and start the refraction ray after this second event.
This option greatly increases the quality of thin glass objects.
Eevee’s Subsurface Scattering algorithm works by blurring the irradiance in screen space. This means that if no visible part of the surface is lit, the effect disappears.
However, true Subsurface Scattering goes beneath the surface and can travel a large distance. This is why a human ear lit from behind appears red on the front side.
That is what this effect mimics. This translucency approximation only works with lights that have shadow maps and only on Subsurface BSDFs (not the Translucency BSDFs). It does not work with indirect lighting. The soft parameter of the shadow maps also affects this effect.
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