Gestures: new grab gesture for positioning

[cqtan]

Instead of doing a collision with hand and furniture, another idea that includes raycasting as a way to manipulate objects further away is made. By outlining furniture that the user targets with raycasting from 1 hand, it becomes visibly clear what the user is targeting. While the ray collides with the furniture and the user performs and holds the grab gesture, the furniture is attached to the point of collision, making the furniture move with the ray in relation to the distance of the hand.

• make raycast from hand
• make outline react to raycast collision
• make furniture lerp smoothly to initial point of collision on the ray

[cqtan]

Slight change to the way objects are grabbed. Instead of raycasting from the hand, the ray origins from the camera, i.e. the user's headmotion instead. Reason for this are:

• unstable positioning of the vr-hands of Leap themselves
• the sometimes low refresh rate of the vr-hand motion
• problems with aiming generally with the hand

Now the user can simply look at the object, it will be outlined with a yellow-ish border and the user can perform a 1-handed grab gesture anywhere in the tracking field of the Leap to reposition the object. The distance of the object will be handled in the next ticket (#15).