Luna Real Time Shadows

Luna now supports Realtime Shadows!

The Playable Plugin team have been working on implementing Real Time Shadows (RTS) to improve the visual experience and usability of playable builds generated with the Playable plugin for Unity.

Several games in the industry rely on RTS to improve the visual performance of their experiences, and our team aims to bring the same level of quality to playables.

On this page you can find out what features of Unity's Real Time Shadows Luna currently supports.

Feature details

Here are some examples of how Luna RTS can enhance your creative process.

Day and Night

No shadows

With shadows

Tanks!

Angle 1

Angle 2

Viking Village

Angle 1

Angle 2

Angle 3

Supported Features and Known Issues

The current RTS solution supports the following features:

• One light source per scene.
• Shadows from Directional Light are supported.
  • Point and Spot lights are not supported yet.
• Stable Fit shadow projection is supported.
• Hard and Soft shadows are supported.
• Shadows are working only with the Built-in Rendering Pipeline.
• Shadows are working in all Unity versions supported by Luna.
• Luna RTS works with custom shadow-casting shader passes.
  • The shader pass should have LightMode set to ShadowCaster.

Supported settings

Lights

Setting	Supported	Details
Directional Light	Yes
Point Light	No
Spot Light	No
Multiple light sources	No	Only one light source is currently supported.

Shadow Settings in Quality Settings

Shadow Types

Setting	Supported	Details
No shadows	Yes
Hard and Soft shadows	Yes

Shadowmask Mode

Setting	Supported	Details
Shadowmask	Yes	Only Shadowmask mode is currently supported.
Distance Shadowmask	No

Shadow Resolution

Setting	Supported	Details
Low (512x512 px)	Yes
Medium (1024x1024 px)	Yes
High (2048x2048 px)	Yes
Very High (4096x4096 px)	Yes	Very High shadow resolution could not be supported on some devices due to the texture size used.

Shadow Projection

Setting	Supported	Details
Close Fit	No
Stable Fit	Yes	Only Stable Fit projection is currently supported.

Shadow Distance

Setting	Supported
Shadow Distance	Yes

Shadow Near Plane Offset

Setting	Supported	Details
Near Plane	No	Both global Near Plane setting (in Quality Settings) and individual Near Plane setting (in the Light component) are currently not supported.

Shadow Cascades

Setting	Supported
No Cascades	Yes
2 Cascades	Yes
4 Cascades	Yes
Cascades Split	Yes

Shadow Settings in Light Component

Setting	Supported	Details
No shadows	Yes
Hard shadows	Yes
Soft shadows	Yes
Strength	Yes
Resolution	Yes
Bias	Yes
Normal Bias	Yes
Near Plane	No	Both global Near Plane setting (in Quality Settings) and individual Near Plane setting (in the Light component) are currently not supported.

Shadow Settings in Luna Window

Setting	Supported	Details
Realtime Shadows	Yes	This setting is used to rapidly disable shadows for the whole project without editing existing shadow settings in Light components and Quality Settings.

Shadow Settings in Mesh Renderer

Setting	Supported
Cast Shadow	Yes
Receive Shadows	Yes

Unity versions support

All Unity versions supported by Luna plugin are compatible with Realtime Shadows.

User Guide

Follow these step to implement Shadows in any of your projects:

1. Open your Unity project and import the Luna plugin.
2. Create or open a scene.
3. Add a Directional Light to the scene:
   1. Ensure that Shadows Casting is enabled in the Light component.
   2. Select Hard Shadows or Soft Shadows option in Shadow Type property.
4. Add an a shadow casters (e.g. cube) to the scene:
   1. Ensure that Cast Shadows option is enabled in the Mesh Renderer component.
   2. Ensure that Receive Shadows option is enabled in the Mesh Renderer component.
5. Open the projects Quality Settings (Edit → Project Settings → Quality)
   1. Select Shadowmask option in Shadowmask Mode field.
   2. Select Hard or Hard and Soft shadows mode in Shadows field.
   3. Select any option in Shadow Resolution.
   4. Select Stable Fit option in Shadow Projection field.
   5. Select the desired Shadow Distance.
   6. Select any option in Shadow Cascades field (it is best to try the No cascades option first since it has the least impact on performance).
   7. Select desirable Cascade split if youve selected at least 2 cascades.
6. Play with the shadow settings until you the wanted result.
7. Open the Luna window and enable shadows:
   1. Check the Realtime Shadows option in Settings → Advanced → Realtime Shadows (see screenshot).
8. Export Luna project and inspect the results.

Limitations and Performance Characteristics

A project with shadows enabled will perform slower than one without. Thats because each shadow-casting object that affects the final shadow image is rendered at least twice: once for shadow casting, and once for regular rendering. The number of draw-calls per caster is depending on the shadow settings (e.g. cascades count) and the number of passes for the regular mesh rendering.

Recommendations to lower hit on performance:

• Reduce the number of shadowcasters (shadows that are visible to the camera)
• Reduce the amount of cascades used (ideally No cascades).
• Use a smaller shadow distance.
• Lower the resolution of the shadows.
• Use only Hard shadows.

Important

Shadows may negatively impact performance on some devices, or they may not work at all. This could be related to the device specific limitations (e.g. GPU memory). In order to resolve this issue, try lowering the shadow settings, and ensure that Unity's WebGL1 build on the device is able to render shadows.

Universal Render Pipeline Shadows

Universal Render Pipeline (URP) shadows are not currently supported.