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    <p>The semantic strings are SCNGeometrySourceSemanticVertex|Normal|Texcoord ...</p> <p>For multiple spheres the answer is yes, you have to transform the vertex/normals with the current node transform before flattening.</p> <p>Below is a simplified example (i.e it only supports merging the childs of "input" if they all have the same geometry)</p> <pre><code>- (SCNNode *) flattenNodeHierarchy:(SCNNode *) input { SCNNode *result = [SCNNode node]; NSUInteger nodeCount = [[input childNodes] count]; if(nodeCount &gt; 0){ SCNNode *node = [[input childNodes] objectAtIndex:0]; NSArray *vertexArray = [node.geometry geometrySourcesForSemantic:SCNGeometrySourceSemanticVertex]; SCNGeometrySource *vertex = [vertexArray objectAtIndex:0]; SCNGeometryElement *element = [node.geometry geometryElementAtIndex:0]; //todo: support multiple elements NSUInteger primitiveCount = element.primitiveCount; NSUInteger newPrimitiveCount = primitiveCount * nodeCount; size_t elementBufferLength = newPrimitiveCount * 3 * sizeof(int); //nTriangle x 3 vertex * size of int int* elementBuffer = (int*)malloc(elementBufferLength); /* simple case: here we consider that all the objects to flatten are the same In the regular case we should iterate on every geometry and accumulate the number of vertex/triangles etc...*/ NSUInteger vertexCount = [vertex vectorCount]; NSUInteger newVertexCount = vertexCount * nodeCount; SCNVector3 *newVertex = malloc(sizeof(SCNVector3) * newVertexCount); SCNVector3 *newNormal = malloc(sizeof(SCNVector3) * newVertexCount); //assume same number of normal/vertex //fill NSUInteger vertexFillIndex = 0; NSUInteger primitiveFillIndex = 0; for(NSUInteger index=0; index&lt; nodeCount; index++){ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; node = [[input childNodes] objectAtIndex:index]; NSArray *vertexArray = [node.geometry geometrySourcesForSemantic:SCNGeometrySourceSemanticVertex]; NSArray *normalArray = [node.geometry geometrySourcesForSemantic:SCNGeometrySourceSemanticNormal]; SCNGeometrySource *vertex = [vertexArray objectAtIndex:0]; SCNGeometrySource *normals = [normalArray objectAtIndex:0]; if([vertex bytesPerComponent] != sizeof(float)){ NSLog(@"todo: support other byte per component"); continue; } float *vertexBuffer = (float *)[[vertex data] bytes]; float *normalBuffer = (float *)[[normals data] bytes]; CATransform3D t = [node transform]; GLKMatrix4 matrix = MyGLKMatrix4FromCATransform3D(t); //append source for(NSUInteger vIndex = 0; vIndex &lt; vertexCount; vIndex++, vertexFillIndex++){ GLKVector3 v = GLKVector3Make(vertexBuffer[vIndex * 3], vertexBuffer[vIndex * 3+1], vertexBuffer[vIndex * 3 + 2]); GLKVector3 n = GLKVector3Make(normalBuffer[vIndex * 3], normalBuffer[vIndex * 3+1], normalBuffer[vIndex * 3 + 2]); //transform v = GLKMatrix4MultiplyVector3WithTranslation(matrix, v); n = GLKMatrix4MultiplyVector3(matrix, n); newVertex[vertexFillIndex] = SCNVector3Make(v.x, v.y, v.z); newNormal[vertexFillIndex] = SCNVector3Make(n.x, n.y, n.z); } //append elements //here we assume that all elements are SCNGeometryPrimitiveTypeTriangles SCNGeometryElement *element = [node.geometry geometryElementAtIndex:0]; const void *inputPrimitive = [element.data bytes]; size_t bpi = element.bytesPerIndex; NSUInteger offset = index * vertexCount; for(NSUInteger pIndex = 0; pIndex &lt; primitiveCount; pIndex++, primitiveFillIndex+=3){ elementBuffer[primitiveFillIndex] = offset + _getIndex(inputPrimitive, bpi, pIndex*3); elementBuffer[primitiveFillIndex+1] = offset + _getIndex(inputPrimitive, bpi, pIndex*3+1); elementBuffer[primitiveFillIndex+2] = offset + _getIndex(inputPrimitive, bpi, pIndex*3+2); } [pool drain]; } NSArray *sources = @[[SCNGeometrySource geometrySourceWithVertices:newVertex count:newVertexCount], [SCNGeometrySource geometrySourceWithNormals:newNormal count:newVertexCount]]; NSData *newElementData = [NSMutableData dataWithBytesNoCopy:elementBuffer length:elementBufferLength freeWhenDone:YES]; NSArray *elements = @[[SCNGeometryElement geometryElementWithData:newElementData primitiveType:SCNGeometryPrimitiveTypeTriangles primitiveCount:newPrimitiveCount bytesPerIndex:sizeof(int)]]; result.geometry = [SCNGeometry geometryWithSources:sources elements:elements]; //cleanup free(newVertex); free(newNormal); } return result; } //helpers: GLKMatrix4 MyGLKMatrix4FromCATransform3D(CATransform3D transform) { GLKMatrix4 m = {{transform.m11, transform.m12, transform.m13, transform.m14, transform.m21, transform.m22, transform.m23, transform.m24, transform.m31, transform.m32, transform.m33, transform.m34, transform.m41, transform.m42, transform.m43, transform.m44}}; return m; } GLKVector3 MySCNVector3ToGLKVector3(SCNVector3 vector) { GLKVector3 v = {{vector.x, vector.y, vector.z}}; return v; } </code></pre>
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    1. COThanks for taking the time to do this. Looks like a great solution! Will be testing it now :) and making sure I understand it line-by-line.
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