Add ViewDirectionNode

examples/jsm/nodes/Nodes.js

@@ -99,6 +99,7 @@ export { default as TextureNode, texture, textureLoad, /*textureLevel,*/ sampler
 export { default as TextureStoreNode, textureStore } from './accessors/TextureStoreNode.js';
 export { default as UVNode, uv } from './accessors/UVNode.js';
 export { default as UserDataNode, userData } from './accessors/UserDataNode.js';
+export { default as ViewDirectionNode, viewDirection, viewDirectionLocal, viewDirectionWorld } from './accessors/ViewDirectionNode.js';
 
 // display
 export { default as BlendModeNode, burn, dodge, overlay, screen } from './display/BlendModeNode.js';

examples/jsm/nodes/accessors/ViewDirectionNode.js

@@ -0,0 +1,30 @@
+import Node, { addNodeClass } from '../core/Node.js';
+import { positionLocal, positionWorld } from './PositionNode.js';
+import { cameraPosition } from './CameraNode.js';
+import { nodeProxy } from '../shadernode/ShaderNode.js';
+
+class ViewDirectionNode extends Node {
+
+	constructor( positionNode ) {
+
+		super( 'vec3' );
+
+		this.positionNode = positionNode;
+
+	}
+
+	setup() {
+
+		return this.positionNode.sub( cameraPosition ).normalize();
+
+	}
+
+}
+
+export default ViewDirectionNode;
+
+export const viewDirection = nodeProxy( ViewDirectionNode );
+export const viewDirectionLocal = viewDirection( positionLocal );
+export const viewDirectionWorld = viewDirection( positionWorld );
+
+addNodeClass( 'ViewDirectionNode', ViewDirectionNode );