first commit

public/sdk/three/jsm/nodes/utils/SpriteSheetUVNode.js

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+import Node, { addNodeClass } from '../core/Node.js';
+import { uv } from '../accessors/UVNode.js';
+import { nodeProxy, float, vec2 } from '../shadernode/ShaderNode.js';
+
+class SpriteSheetUVNode extends Node {
+
+	constructor( countNode, uvNode = uv(), frameNode = float( 0 ) ) {
+
+		super( 'vec2' );
+
+		this.countNode = countNode;
+		this.uvNode = uvNode;
+		this.frameNode = frameNode;
+
+	}
+
+	setup() {
+
+		const { frameNode, uvNode, countNode } = this;
+
+		const { width, height } = countNode;
+
+		const frameNum = frameNode.mod( width.mul( height ) ).floor();
+
+		const column = frameNum.mod( width );
+		const row = height.sub( frameNum.add( 1 ).div( width ).ceil() );
+
+		const scale = countNode.reciprocal();
+		const uvFrameOffset = vec2( column, row );
+
+		return uvNode.add( uvFrameOffset ).mul( scale );
+
+	}
+
+}
+
+export default SpriteSheetUVNode;
+
+export const spritesheetUV = nodeProxy( SpriteSheetUVNode );
+
+addNodeClass( 'SpriteSheetUVNode', SpriteSheetUVNode );