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It's Object3D subclass that takes a position from the scene graph hierarchy but uses its local rotation as world rotation.

It works like real-world gyroscope - you can move it around using hierarchy while its orientation stays fixed with respect to the world.

To have lighting consistent with shadows when using target.

Before SpotLight was a weird mix of shadow casted from PointLight and light casted from DirectionalLight.

After shadow mapping fixes orthographic shadow projection finally started to work.

Work in progress. Still need to figure out some way to set up shadow camera automagically with respect to the actual camera (so that whole scene is shadowed when the camera moves). For the moment shadow camera needs to be handled manually (like for SpotLight).

As per discussion here: https://github.com/alteredq/three.js/commit/835b57addaf328412b61a2b644ff5efd7fe6d25e

Bah, this one was tricky. World positions are not updated for objects that are not part of the scene graph so spotlight target was just hanging in limbo.

Thanks GUI-DAT ;)

This should allow to have spotlights as a parts of hierarchy.

Sidenote: these extra verbose Closure warnings are starting to pay off - I keep catching subtle bugs (like missing dependencies in rarely used code corners).

This allows to have different shadow map parameters for different lights, also it's easier to access parameters for tweaking / debugging.

Changes:

renderer.shadowMapWidth    => spotLight.shadowMapWidth
renderer.shadowMapHeight   => spotLight.shadowMapHeight

renderer.shadowMapBias     => spotLight.shadowBias
renderer.shadowMapDarkness => spotLight.shadowDarkness

renderer.shadowCameraNear  => spotLight.shadowCameraNear
renderer.shadowCameraFar   => spotLight.shadowCameraFar
renderer.shadowCameraFov   => spotLight.shadowCameraFov

Also added new uniform type "v2v" for array of Vector2 (to support per-light sizes of shadow maps).

This is for seeing how camera actually looks (frustum, line-of-sight, up), it's not a camera. Not sure about the name.

Fixed bug where depth buffer is not cleared if last object rendered on previous render cycle disabled depth mask.