USDZExporter: Add support for interleaved data. (#22633)

examples/jsm/exporters/USDZExporter.js

@@ -247,7 +247,7 @@ function buildMesh( geometry ) {
 
 function buildMeshVertexCount( geometry ) {
 
-	const count = geometry.index !== null ? geometry.index.array.length : geometry.attributes.position.count;
+	const count = geometry.index !== null ? geometry.index.count : geometry.attributes.position.count;
 
 	return Array( count / 3 ).fill( 3 ).join( ', ' );
 
@@ -255,18 +255,26 @@ function buildMeshVertexCount( geometry ) {
 
 function buildMeshVertexIndices( geometry ) {
 
-	if ( geometry.index !== null ) {
+	const index = geometry.index;
+	const array = [];
 
-		return geometry.index.array.join( ', ' );
+	if ( index !== null ) {
 
-	}
+		for ( let i = 0; i < index.count; i ++ ) {
 
-	const array = [];
-	const length = geometry.attributes.position.count;
+			array.push( index.getX( i ) );
+
+		}
+
+	} else {
+
+		const length = geometry.attributes.position.count;
+
+		for ( let i = 0; i < length; i ++ ) {
 
-	for ( let i = 0; i < length; i ++ ) {
+			array.push( i );
 
-		array.push( i );
+		}
 
 	}
 
@@ -284,11 +292,14 @@ function buildVector3Array( attribute, count ) {
 	}
 
 	const array = [];
-	const data = attribute.array;
 
-	for ( let i = 0; i < data.length; i += 3 ) {
+	for ( let i = 0; i < attribute.count; i ++ ) {
+
+		const x = attribute.getX( i );
+		const y = attribute.getY( i );
+		const z = attribute.getZ( i );
 
-		array.push( `(${ data[ i + 0 ].toPrecision( PRECISION ) }, ${ data[ i + 1 ].toPrecision( PRECISION ) }, ${ data[ i + 2 ].toPrecision( PRECISION ) })` );
+		array.push( `(${ x.toPrecision( PRECISION ) }, ${ y.toPrecision( PRECISION ) }, ${ z.toPrecision( PRECISION ) })` );
 
 	}
 
@@ -306,11 +317,13 @@ function buildVector2Array( attribute, count ) {
 	}
 
 	const array = [];
-	const data = attribute.array;
 
-	for ( let i = 0; i < data.length; i += 2 ) {
+	for ( let i = 0; i < attribute.count; i ++ ) {
+
+		const x = attribute.getX( i );
+		const y = attribute.getY( i );
 
-		array.push( `(${ data[ i + 0 ].toPrecision( PRECISION ) }, ${ 1 - data[ i + 1 ].toPrecision( PRECISION ) })` );
+		array.push( `(${ x.toPrecision( PRECISION ) }, ${ 1 - y.toPrecision( PRECISION ) })` );
 
 	}