One TSL function calculating two values for two nodes

[boytchev]

How to implement efficiently this scenario in TSL:

• one function calculates both color and opacity
• color goes to one node
• opacity goes to another node

This scenario is in src/clouds.js and raises two issues:

• Maybe the TSL function is calculated twice - once for color and again for opacity
• The translation into fallback WebGL2 is rather slow - up to 3-4 seconds

[mrdoob]

/ping @sunag

[sunag]

Wouldn't it be better to return a vec4() and let the user choose whether to use rgb or a?

tsl-textures/src/clouds.js

Lines 30 to 34 in fd9373a

	var clouds = Fn( ( params ) => {
	return _clouds( params ).rgb;
	} );