GlowBorderEffect

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GlowBorderEffect

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# Glow Boarder Effect

![Glow Border Effect](https://raw.githubusercontent.com/Magodra/GlowBorderEffect/master/screenshots/icon.png)

The **Glow Boarder Effect Renderer** contains shader setup with a glowing boarder effect for selected objects.
The user can turn the **glow border effect** on and off and select **glow color** for individual objects.
Either automatically or manual camera update can be selected. In automatic mode the the internal camera will 
use the current camera to align the internal rendering. See Manual updating the camera for details regarding
manual mode.

# How does it work?
![Glow Border Effect Demo Scene](https://raw.githubusercontent.com/Magodra/GlowBorderEffect/master/screenshots/glow_border_effect_demo_scene.PNG)

The **GlowBorderEffectRender** scene is included in the scene tree and objects that should recevie the glow border effect
must include the GDScript **glow_border_effect_object.gd** on a Spatial node that is a parent to any **VisualInstances** the object
may consists of. In the demo project the GlowingObject is a Spatial node with a MeshInstance as the child.

## Manual Updating camera

If **Automatically Update camera** is uncheck on the **Glob Boarder Effect Renderer** the internal camera need to be updated
manually. The script below show how to update the camera manually. This isn't needed if automatically update is selected.

```GDScript
# Called when the node enters the scene tree for the first time.
func _ready():
	# Update the internal cameras in the glow border effect renderer.
	_glow_border_effect_renderer.set_camera_parameters(self)
	
	# Turn on notification for camera transform changes.
	set_notify_transform(true)

# Called when the node receive notifications.
func _notification(what):
	# Update the camera transform each time the camera transform change
	if what == NOTIFICATION_TRANSFORM_CHANGED:
		_glow_border_effect_renderer.camera_transform_changed(self)
```

# Behind the scene
![Glow Boarder Effect Internal Scene](https://raw.githubusercontent.com/Magodra/GlowBorderEffect/master/screenshots/glow_border_effect_internal_scene.PNG)

Inside the **GlowBorderEffectRender** a number of ViewportContainers and Viewports are used with shaders that
first in the prepass render a shadow instance of each of the objects with glow border effect enabled. The 
prepass is so filtered with a blure filter to produce the glowing effect. Finaly the scene is rendered with a
shader that do:
```
scene_color + (blure - prepass)
```

The different steps are illustrated in the screendump below from the **glow_border_efffect_explained** scene.

## Screenshots

![Glow Boarder Effect Explained](https://raw.githubusercontent.com/Magodra/GlowBorderEffect/master/screenshots/glow_border_effect_explained.PNG)

GlowBorderEffect

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