getBindGroupArray( groupName, shaderStage ) {

		const bindings = this.bindings[ shaderStage ];

		let bindGroup = bindings[ groupName ];

		if ( bindGroup === undefined ) {

			if ( this.bindingsIndexes[ groupName ] === undefined ) {

				this.bindingsIndexes[ groupName ] = { binding: 0, group: Object.keys( this.bindingsIndexes ).length };

			}

			bindings[ groupName ] = bindGroup = [];

		}

		return bindGroup;

	}
Returns an array of node uniform groups for the given group name and shader stage.

@param {string} groupName - The group name.
@param {('vertex'|'fragment'|'compute'|'any')} shaderStage - The shader stage.
@return {Array<NodeUniformsGroup>} The array of node uniform groups.