RemapNode + BlendModeNode

[sunag]

Description

• BlendModeNode
  • Burn, Dodge, Overlay,Screen, Difference( outside BlendModeNode because it has other uses )
• RemapNode
• OscNode: use construct) instead of generate() to improve cache
• MathNode: add missing functions

This contribution is funded by Google via Igalia

[sunag]

Usage:

import { overlay } from 'three/nodes';
...
const optA = overlay( base, blend );
const optB = mix( base, overlay( base, blend ), opacity );