Differential D4205 Diff 13203 manual/render/eevee/lightprobes/irradiance_volumes.rst

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manual/render/eevee/lightprobes/irradiance_volumes.rst

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	Irradiance Volumes	Irradiance Volumes
	******************	******************

	Diffuse indirect lighting is stored into volumetric arrays.	Diffuse indirect lighting is stored in volumetric arrays.
	These arrays are defined by the user using Irradiance Volumes objects.	These arrays are defined by the user using Irradiance Volume objects.
	They give control on how arrays are placed in the world as well as their resolution.	They control how arrays are placed in the world as well as their resolution.

	Lighting is computed at the dots positions visible when the Irradiance Volume object is selected.	Lighting is computed at the dot positions visible when the Irradiance Volume object is selected.

	.. seealso::	.. seealso::
	:doc:`Indirect Lighting </render/eevee/indirect_lighting>`.	:doc:`Indirect Lighting </render/eevee/indirect_lighting>`.

	If Ambient Occlusion is enabled, it will be applied onto diffuse indirect lighting.	If Ambient Occlusion is enabled, it will be applied onto diffuse indirect lighting.
	If both Ambient Occlusion and "Bent Normals" are enabled,	If both Ambient Occlusion and "Bent Normals" are enabled
	the indirect lighting will be sampled from the least occluded direction and appear more correct.	the indirect lighting will be sampled from the least occluded direction and appear more correct.

	.. admonition:: Reference	.. admonition:: Reference
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	Distance	Distance
	A probe object only influences the lighting of nearby surfaces.	A probe object only influences the lighting of nearby surfaces.
	This influence zone is defined by the Distance parameter and object scaling.	This influence zone is defined by the Distance parameter and object scaling.
	It is a bit different, depending on the probe type.	The influence distance varies is a bit, depending on the probe type.
		fclemUnsubmitted Not Done Inline Actions Shouldn't it be "The influence distance varies depending on the probe type."? fclem: Shouldn't it be "The influence distance varies depending on the probe type."?

	For Irradiance Volumes, the influence inside the volume is always 100%.	For Irradiance Volumes, the influence inside the volume is always 100%.
	The influence decays only outside of the volume until	The influence decays only outside of the volume until
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	Intensity	Intensity
	Intensity factor of the recorded lighting.	Intensity factor of the recorded lighting.
	Making this parameter anything other than 1.0 is not physically correct. Use it for tweaking or artistic purpose.	Making this parameter anything other than 1.0 is not physically correct. Use it for tweaking or artistic purposes.

	Resolution	Resolution
	Spatial resolution for Irradiance Volumes is determined per probe.	Spatial resolution for Irradiance Volumes is determined per probe.
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	One irradiance sample will be computed for each cell in this grid.	One irradiance sample will be computed for each cell in this grid.

	Clipping	Clipping
	Define the near and far clip distances when capturing the scene.	Defines the near and far clip distances when capturing the scene.

	.. warning::	.. warning::

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	In some cases, it is useful to limit which objects appear in the light probe's captured lighting.	In some cases, it is useful to limit which objects appear in the light probe's captured lighting.
	For instance, an object that is too close to a capture point might be better excluded.	For instance, an object that is too close to a capture point might be better excluded.
	This is what the visibility collection does.	This is what the visibility collection does.
	Only objects that are in this collection will be visible when this probes will capture the scene.	Only objects that are in this collection will be visible when this probes captures the scene.

	There is also an option to invert this behavior and effectively hide the objects inside this collection.	There is also an option to invert this behavior and effectively hide the objects in this collection.

	.. note::	.. note::

	This is only a filtering option. This means that if an object is not visible at render time	This is only a filtering option. That means that if an object is not visible at render time
	it won't be visible in during the probe render.	it won't be visible during the probe render.


	Visibility	Visibility
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	For every grid point a small Variance Shadow Map is rendered.	For every grid point a small Variance Shadow Map is rendered.
	This visibility cubemap is used to reduce light leaking behind occluders.	This visibility cubemap is used to reduce light leaking behind occluders.
	You can tweak the size of this map inside the render settings and	You can tweak the size of this map inside the render settings and
	tweak the bias and blur factors per Grid inside the Probe Properties tab.	tweak the bias and blur factors per grid inside the Probe Properties tab.

	Bias	Bias
	Reduce self shadowing.	Reduces self-shadowing.

	Bleed Bias	Bleed Bias
	Increase the "contrast" of the depth test result.	Increases the "contrast" of the depth test result.

	Blur	Blur
	Amount of blur to apply when filtering the visibility shadow map.	Amount of blur to apply when filtering the visibility shadow map.
	Does not increase runtime cost, has a small effect on baking time.	Does not increase runtime cost but has a small effect on baking time.


	Blending	Blending
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	The lighting values from an Irradiance Volume will fade outwards until the volume bounds are reached.	The lighting values from an Irradiance Volume will fade outwards until the volume bounds are reached.
	They will fade into the world's lighting or another Irradiance Volume's lighting.	They will fade into the world's lighting or another Irradiance Volume's lighting.

	If multiple Irradiance Volumes overlaps, smaller (in volume) ones will always have more priority.	If multiple Irradiance Volumes overlaps, those smaller (in volume) will always have priority.

	If an object is not inside any Irradiance Volume, or if the indirect lighting has not been baked,	If an object is not inside any Irradiance Volume, or if the indirect lighting has not been baked,
	the world's diffuse lighting will be used to shade it.	the world's diffuse lighting will be used to shade it.
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	.. tip::	.. tip::

	- When lighting indoor environment, try to align grids with the room shape.	- When lighting indoor environments, try to align grids with the room shape.
	- Try not to put too much resolution in empty areas or areas with low amount of lighting variation.	- Try not to put too much resolution in empty areas or areas with a low amount of lighting variation.
	- You can fix bad samples by adding a smaller grid near the problematic area.	- You can fix bad samples by adding a smaller grid near the problematic area.


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