SSRPass: Correct Reflector depth.

[gonnavis]

Previously, a hack was used to adjust maxDistance to let tDepth at the default camera distance has a relatively stable value. However, after changing the camera distance, the value of tDepth will also change.

Now the correct way to calculate tDepth is used, so that there is a stable value in any situation.
But at the trade off of turned off Oblique Near-Plane Clipping feature, because of it distort tDepth severely, and I feel need more long time to learn how to compensate it.
Any way, the Oblique Near-Plane Clipping is just used to fix the issue when something in bettwen virtualCamera and Reflector, for this demo scene and many groundReflectors, I think it's not a problem and correct tDepth is more important. I'll keep research how to compensate.

Before:

After:

[mrdoob]

How is isDistanceAttenuation used?

[gonnavis]

If on, the reflection's opacity will has fade effect, otherwise all same opacity.
And because of I used it as defines, so don't want set it and update material in render loop, thus used defineProperty to watch it's state change.

isDistanceAttenuation on:

isDistanceAttenuation off:

[mrdoob]

Then I think the property should be called distanceAttenuation.

[gonnavis]

OK. Shall I change all variables prefixed with is: isOtherMeshes, isGroundReflector, isPerspectiveCamera, isFresnel, isDistanceAttenuation, isOtherMeshes, isBouncing, isInfiniteThick, isBlur, isSelecctive to their none-is-prefixed version?

[gonnavis]

I looked at several examples with gui, found really no setting name prefixed with 'is', and feel need ensure consistency, so I renamed all words prefixed with is.
In addition, renamed all defines to uppercase.

[mrdoob]

Sorry, seems like we introduced conflicts.
Do you mind resolving them?

[gonnavis]

Resolved.

[mrdoob]

Thanks!