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

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manual/render/eevee/limitations.rst

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	Limitations	Limitations
	***********	***********

	Eevee's goal is to be an interactive render engines. Some features may not be there yet or	Eevee's goal is to be an interactive render engine. Some features may not be there yet or
	may be impossible to implement into Eevee's architecture without compromising performance.	may be impossible to implement into Eevee's architecture without compromising performance.

	Here is a rather exhaustive list of all the limitations you can expect while working with Eevee.	Here is a rather exhaustive list of all the limitations you can expect while working with Eevee.
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	- Shadows are not supported on light instances (dupli objects, group instancing).	- Shadows are not supported on light instances (dupli objects, group instancing).
	- Only 128 active lights can be supported by Eevee in a scene.	- Only 128 active lights can be supported by Eevee in a scene.
	- Only 8 Shadowed sun lights can be supported at the same time.	- Only 8 Shadowed sun lights can be supported at the same time.
	- As of now, lights can only have one color and does not support light node trees.	- As of now, lights can only have one color and Eevee does not support light node trees.


	Light Probes	Light Probes
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	Indirect Lighting	Indirect Lighting
	=================	=================

	- Volumetrics don't receive light from Irradiance Volumes but does receive world's diffuse lighting.	- Volumetrics don't receive light from Irradiance Volumes but do receive world's diffuse lighting.
	- Eevee does not support "specular to diffuse" light bounces nor "specular to specular" light bounces.	- Eevee does not support "specular to diffuse" light bounces nor "specular to specular" light bounces.
	All specular lighting is turned off during baking.	- All specular lighting is turned off during baking.


	Volumetrics	Volumetrics
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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 Irradiance Volumes but does receive world's diffuse lighting.	- Volumetrics don't receive light from Irradiance Volumes but do receive world's diffuse lighting.
	- Volumetric shadowing does only work on other volumetrics. They won't cast shadows on solid objects in the scene.	- Volumetric shadowing does only work on other volumetrics. It won't cast shadows on solid objects in the scene.
	- Volumetric shadowing does only work for volumes inside the view frustum.	- Volumetric shadowing does only work 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.


	Screen Space Reflections	Screen Space Reflections
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	========================	========================

	- Only one glossy BSDF can emit screen space reflections.	- Only one glossy BSDF can emit screen space reflections.
	- The chosen BSDF is currently arbitrary chosen.	- The chosen BSDF is currently arbitrarily chosen.
	- Screen Space Reflections will reflect transparent objects and objects using Screen Space Refraction	- Screen Space Reflections will reflect transparent objects and objects using Screen Space Refraction
	but without accurate positioning due to the one layer depth buffer.	but without accurate positioning due to the one layer depth buffer.

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	If you absolutely need to render using Bump nodes, render at twice the target resolution and downscale the final output.	If you absolutely need to render using Bump nodes, render at twice the target resolution and downscale the final output.

	Volumes Objects	Volume Objects
	Object volume shaders will affect the whole bounding box of the object.	Object volume shaders will affect the whole bounding box of the object.
	The shape of the volume must be adjusted using procedural texturing inside the shader.	The shape of the volume must be adjusted using procedural texturing inside the shader.

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	Shader Nodes	Shader Nodes
	============	============

	- All BSDF are using approximations to achieve realtime performance	- All BSDF's are using approximations to achieve realtime performance
	so there will always be small differences between Cycles and Eevee.	so there will always be small differences between Cycles and Eevee.
	- Some utility nodes are not yet compatible with Eevee (i.e. Sky Texture node).	- Some utility nodes are not yet compatible with Eevee (i.e. Sky Texture node).

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	As of now Eevee uses OpenGL, and	As of now Eevee uses OpenGL, and
	:abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` Memory management is done by the OpenGL driver.	:abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` Memory management is done by the OpenGL driver.
	In theory, only the needed textures and meshes (now referred as "the resources") for a single draw call (i.e. one object)	In theory, only the needed textures and meshes (now referred as "the resources") for a single draw call (i.e. one object)
	needs to fit into the GPU memory.	need to fit into the GPU memory.

	So if the scene is really heavy, the driver will swap things in and out to make sure all objects are rendered correctly.	So if the scene is really heavy, the driver will swap things in and out to make sure all objects are rendered correctly.

	In practice, using too much GPU memory can make the GPU driver crash, freeze, or kill the application.	In practice, using too much GPU memory can make the GPU driver crash, freeze, or kill the application.
	So be careful of what you ask.	So be careful of what you use.

	There is no standard way of estimating if the resources will fit into the GPU memory and or	There is no standard way of estimating if the resources will fit into the GPU memory and or
	if the GPU will render them successfully.	if the GPU will render them successfully.
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	Being an OpenGL engine, Eevee only uses the power of	Being an OpenGL engine, Eevee only uses the power of
	the :abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` to render.	the :abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` to render.
	There is no plan to support :abbr:`CPU (Central Processing Unit)` (software) rendering as it would be very inefficient.	There is no plan to support :abbr:`CPU (Central Processing Unit)` (software) rendering as it would be very inefficient.
	CPU power is still needed to handle high complexity scene as the geometry	CPU power is still needed to handle high scene complexity as the geometry
	is still being prepared by the CPU before rendering each frame.	must be prepared by the CPU before rendering each frame.


	Multiple GPU Support	Multiple GPU Support
	====================	====================

	There is currently no support for multiple :abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` system.	There is currently no support for multiple :abbr:`GPU (Graphic Processing Unit, also known as Graphics Card)` systems.


	Headless Rendering	Headless Rendering
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