[Controller] Provide highlight of controllers on interactions (touch/grab/use) about vrtk HOT 6 CLOSED

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.

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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?

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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.

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Can use SkinnedMeshRenderer to change the controller colour

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

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Kinda completed with: 1c7c93b

I'm closing for now

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