Differential D4205 Diff 13203 manual/render/eevee/volumetrics.rst

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manual/render/eevee/volumetrics.rst

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	Volumetrics	Volumetrics
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	Eevee simulate volumetric scattering by evaluating all volume objects inside a the view frustum.	Eevee simulates volumetric scattering by evaluating all volume objects inside the view frustum.

	For this is uses several 3D texture which have a high video memory usage.	For this is uses several 3D textures which have a high video memory usage.
	The textures dimensions can be tweaked using the Tile Size and Samples parameters.	The textures dimensions can be tweaked using the Tile Size and Samples parameters.

	Object volumes have some limitations (link).	Object volumes have some limitations (link).
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	End distance of the volumetric effect.	End distance of the volumetric effect.

	Tile Size	Tile Size
	Control the quality of the volumetric effects. Lower size increase video memory usage and quality.	Controls the quality of the volumetric effects. Lower size increases video memory usage and quality.
	This is the size in pixels, of a volumetric cell.	This is the size in pixels of a volumetric cell.

	Samples	Samples
	Number of samples to compute volumetric effects. Higher count increase video memory usage and quality.	Number of samples to compute volumetric effects. Higher count increases video memory usage and quality.
	These samples are distributed along the view depth (view Z axis).	These samples are distributed along the view depth (view Z axis).

	Distribution	Distribution
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	Unnecessary if no Volume Scatter is present in the scene.	Unnecessary if no Volume Scatter is present in the scene.

	Light Clamping	Light Clamping
	Clamp light contribution to the volume scattering effect. Reduce flickering and noise.	Clamp light contribution of the volume scattering effect. Reduces flickering and noise.
	Set to 0.0 to disable the clamping.	Set to 0.0 to disable clamping.


	Volumetric Shadows	Volumetric Shadows
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	Approximate light absorption of the surrounding volume objects. This makes the volumes more opaque to light.	Approximate light absorption of the surrounding volume objects. This makes the volumes more opaque to light.
	This is a very expensive option and have limitations (link).	This is a very expensive option and has limitations (link).

	Shadow Samples	Shadow Samples
	Number of samples to compute volumetric shadowing.	Number of samples to compute volumetric shadowing.
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	- Only single scattering is supported.	- Only single scattering is supported.
	- Volumetrics are rendered only for the camera "rays". They don't appear in reflections/refractions and probes.	- Volumetrics are rendered only for the camera "rays". They don't appear in reflections/refractions and probes.
	- Volumetrics don't receive Light from light grids but does receive from the world probe.	- Volumetrics don't receive Light from light grids but do receive from the world probe.
	- Volumetric shadowing does only work on other volumetrics.	- Volumetric shadowing only works on other volumetrics.
	- Volumetric shadowing does only work for volumes inside the view frustum.	- Volumetric shadowing only works for volumes inside the view frustum.
	- Volumetric lighting does not respect the lights shapes. They are treated as point lights.	- Volumetric lighting does not respect the lights shapes. They are treated as point lights.
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