[Controller] Provide highlight of controllers on interactions (touch/grab/use)

[thestonefox]

It's not possible to change the colour of the controller meshes as the dark textures of the HTC controllers don't lend themselves well to tints.

However, it may be possible to use a different shader and provide an outline colour on the controller models (like as seen in The Lab)

[thestonefox]

Attempted to use an outline shader on the controller model, but the model shows outlines around all of the sub components and looks quite messy.

[GloryFish]

I spent some time messing with the 2-camera approach described here: http://blog.tammearu.eu/index.php/2015/10/09/unity-outline-glow-2-cameras-edge-detection-and-single-color/

It renders proper outlines for objects including the controller models but I could not get the overlay camera to match the FOV of the SteamVR camera or render in the headset. My guess is this is due to how the SteamVR_Camera component submits frames to the compositor which seems to preclude multiple cameras.

I tested in Unity 5.3. Perhaps the native implementation in 5.4 supports multiple cameras?

[thestonefox]

I've done it with custom shaders, but the controller models are full of edges that when you glow the outline it's not very nice looking.

[thestonefox]

Can use SkinnedMeshRenderer to change the controller colour

[thestonefox]

Trello Card https://trello.com/c/BRJRrzrH

[thestonefox]

Kinda completed with: https://github.com/thestonefox/SteamVR_Unity_Toolkit/commit/1c7c93b8349b7b1d12510792d4cce8f43d1eb988

I'm closing for now