Fixed pixellated backgrounds when using hdr cubemaps.

Fixed dat.gui sliders in envmaps_* examples

NodeMaterial - Intro to boolean, mask and dissolve example

WebGLBackgrounds from cube textures should not check depth buffer

Add missing isScene

Restore energy loss in indirect (IBL) specular lighting via multiscattering approximation

Update TypeScript definition typings to match @types/three

multiscattering via Fdez-Agüera's "A Multiple-Scattering Microfacet
Model for Real-Time Image-based Lighting".

Examples: Clean up

Fix for OrbitControls not allowing keyboard input in iframe

FirstPersonControls: Added .lookAt()

Examples: Consider pixel ratio in FXAA demo for fxaa uniforms

Mesh: Added serialization/deserialization support for .drawMode

ObjectLoader: fix duplicate materials

Rename delta to deltaTime in postprocessing passes

"Delta" is generally used to just mean change. The previous name didn't make it clear what was changing.

Also calculate deltaTime automatically in EffectComposer in case it's not provided.

Audio: Fix usage of detune