Feature/add instanced mesh

[Displee]

With InstancedMesh we can render the same geometry thousands of times with only 1 draw call. This is a big performance boost :)
I've implemented this example: https://threejs.org/examples/webgl_instancing_raycast

Since r106 didn't have this feature, I ripped it from the last threejs release (r125).

[Displee]

For some odd reason the HemisphereLights in the example doesn't cast any light. I'm using a custom color (whitesmoke) for the geometries, but that shouldn't be needed. Should I create an issue for this?

[markaren]

For some odd reason the HemisphereLights in the example doesn't cast any light.

But it does? removing one of the lights clearly alters the perceived color of the spheres

[markaren]

Nice work btw

[Displee]

For some odd reason the HemisphereLights in the example doesn't cast any light.

But it does? removing one of the lights clearly alters the perceived color of the spheres

Well. The geometries should turn white like in the original example without the custom 'whitesmoke' color. If I remove the 'whitesmoke' color the geometries will turn black instead of white.

[markaren]

Aight, I see what is happening.
In three.kt Color() -> black (0,0,0)
In three.js Color() -> white(1,1,1)

[markaren]

Pushed a fix to master. Default rgb color is now white, not black

[Displee]

Ah, good job.