Color Bleed Unity Plugin User Guide

Contents

Introduction

Wilberforce Colorbleed (WC) is our Screen Space Indirect Lighting Plugin for Unity 5 (5.3.0 or higher)

You can download free demo or buy Wilberforce Colorbleed at Unity Asset Store.

Please consider rating the asset to help others discover it.

WC adds another layer of visual quality by simulation of indirect ambient light (i.e. light that reaches the surface by bouncing off of another surface, rather than directly from light source.) This results in objects “bleeding” their color on surfaces around them, making scenes appear more realistic. This effect also adds nice atmosphere to the image.

WC started as a feature for our Volumetric Ambient Occlusion (VAO) Plugin, and thus been in development for quite some time. Integration in VAO imposed a lot of limitations, so we decided to create a standalone color bleeding plugin without restrictions. This means that WC already implements feedback from real applications and also wide range of performance optimizations.

We provide two algorithms - “Point Cloud” for real time applications and “Raymarching” for high quality and fast hardware. Raymarching is suitable for visualizations and still renders.

Both algorithms are fully dynamic without any necessary precomputing, which means that moving objects don’t pose any extra problems.

Due to its Screen Space nature the algorithm is unaffected by level of geometry detail - runs the same way on both high and low-poly scenes.

WC is implemented as an image effect that gets attached to the camera. It features a variety of user-controlled settings, which lets designer to fine-tune the final appearance and balance performance.

Plugin is compatible with Unity Post Processing Stack (Deferred rendering path), all Unity rendering paths (Forward, Deferred and Legacy) and anti-aliasing.

See forum for discussion and contact us at projectwilberforce@gmail.com for additional support. We are open to any questions or requests - after all this plugin started as as suggestion from one of our customers.

Requirements

Installation

  1. Import from Asset Store.
  2. Select your camera component.
  3. From Component menu select Image Effects -> Rendering -> Colorbleed.
  4. Colorbleed effect should now be visible in the Inspector window.
  5. If property Colorbleed shader is not set to “Hidden/Wilberforce/Colorbleed” see Troubleshooting section below on how to fix it.

How to Use

Parameters

WC effect behaviour is controlled by these parameters.

Algorithm We provide two variants of the colorbleed effect.

Radius

Radius sets the distance of how far the algorithm reaches to sample surface colors. Higher radius means longer colorbleed caused by objects further away.

Power

Turn higher to create more pronounced result.

Presence

Presence makes the effect more pronounced towards the crease.

Presence turned off is closer to “physically-based” solution, however, adjust this to suit your scene and desired appearance.

You can also try increasing presence rather than radius to make effect more visible and save performance.

Brightness

This setting supresses the dark shadows. Use this if you want only the transfer of colors.

Saturation

Used to control saturation of the resulting color. When turned all the way down, the appearance is similar to Ambient Occlusion.

Limit Backfaces

Makes surfaces cast color only in front of them - unlike shadows, that are cast both to the front and to the back.

Backface Suppression

Controls the degree of backface suppression. Note that complete suppression creates a sharp falloff of colorbleed at certain edges.

Quality

Number of samples used to calculate WC. Select lower settings if you need faster performance.

Adaptive Sampling

Adaptive sampling means lower number of samples is used on more distant areas of the image. Ideally causes no loss of detail.

Downsampled Pre-pass

Speeds up the calculation by downsampling the parts with less colorbleed. Results in performance boost, especially for higher resolutions.

Downsampling

Reduces resolution of output, use this to gain performance at the cost of quality. Try lowering quality parameter first as this reduces quality dramatically. Having high quality setting with downsampling enabled serves no purpose. Alternatively, use this option if you have some sort of supersampling enabled - as high pixel density would have adverse effect on performance without much visual impact.

Luminance Sensitivity

Reduces colorbleed effect on bright surfaces - either light sources or strongly lit areas. We recommend enabling this in combination with downsampling to reduce the most visible artifact caused by reducing of the colorbleed texture. Also use this to prevent colorbleed on lamps, windows, screens etc.

Enable Blur

In case you are applying your own blur after WC effect, you can try turning this off to save performance. Blur step included in WC is fast and is part of its visual appearance, so you might consider keeping it on all the time. We include controls of size and sharpness. Note that high values (e.g. 7 and above) will slow down the computation. Sharpness does not affect performance.

Output Colorbleed only

Use for development to display only colorbleed component.

Performance and other tips

Performance tips

Disabling Colorbleed for specific objects

If you don’t want some object to cast or receive color - set Rendering Mode of its material to Fade or Transparent. Or use plugin’s Luminance Sensitivity option where possible.

Troubleshooting

Attaching shader

When Colorbleed effect is attached to the camera, its corresponding Colorbleed.shader file is automatically located and bound to Colorbleed Shader property. If this does not happen, make sure that Colorbleed.shader file can be found in the Project window under Assets/Shaders folder. Then bind this shader manually by drag&dropping it to Colorbleed Shader property in Inspector window.

no shader attached
Inspector shows no attached shader
shader attached
Should instead look like this

Contact Information

In case of questions or further issues, please contact us at projectwilberforce@gmail.com