private InstancedMeshGeometryVisual3D AddInstancedTubePath(Point3DCollection spiralPositionCollection, Color4 tubeColor)
{
// Setup InstanceData
var instanceData = new InstanceData[spiralPositionCollection.Count];
// Convert to list of Vector3
var dxCurvePositions = spiralPositionCollection.Select(p => p.ToVector3()).ToList();
// NOTE:
// When a tube path is created from a lot of positions,
// then it is worth to transform the following loop into Parallel.For loop.
var startPosition = dxCurvePositions[0];
for (int i = 1; i < dxCurvePositions.Count; i++)
{
var endPosition = dxCurvePositions[i];
var direction = endPosition - startPosition;
var length = direction.Length(); // length will be used for x scale
var scale = new Vector3(length, 1, 1);
//direction.Normalize(); // Because we already have length, we can quickly normalize with simply dividing by length
direction /= length;
instanceData[i].World = Common.MatrixUtils.GetMatrixFromNormalizedDirection(direction, startPosition, scale);
instanceData[i].DiffuseColor = Color4.White;
startPosition = endPosition;
}
// Create tube mesh with normalized radius (=1) and from (0,0,0) to (1,0,0).
// This mesh is then transformed to connect positions along the path
var tubeLineMesh3D = new Ab3d.Meshes.TubeLineMesh3D(startPosition: new Point3D(0, 0, 0),
endPosition: new Point3D(1, 0, 0),
radius: 1,
segments: 8,
generateTextureCoordinates: false).Geometry;
// Create InstancedMeshGeometryVisual3D
var instancedMeshGeometryVisual3D = new InstancedMeshGeometryVisual3D(tubeLineMesh3D);
instancedMeshGeometryVisual3D.InstancesData = instanceData;
// Set IsSolidColorMaterial to render tube instances with solid color without any shading based on lighting
instancedMeshGeometryVisual3D.IsSolidColorMaterial = true;
// Add instancedMeshGeometryVisual3D to the scene
MainViewport.Children.Add(instancedMeshGeometryVisual3D);
return(instancedMeshGeometryVisual3D);
}
