Generating an ELIPSIOD Generating an ELIPSIOD mickryding (Mechanical) (OP) 24 Jun 03 17:53 Is it possible to generate an elipsiod surface in catia V5R7 ? RE: Generating an ELIPSIOD andy44 (Mechanical) 25 Jun 03 09:35 Try this:1. Create 3 pointsPT1(X=100 Y=0 Z=0)PT2(X=0 Y=50 Z=0)PT3(X=0 Y=0 Z=30)(You can create parametrs to control these points)2. Create a Sketch.1 on XY planeDraw an ellipse an trim it to have only less than 1/4Use PT1 and PT2 to constraint the end points3. Create a Sketch.2 on YZ planeDraw an ellipse an trim it to have only less than 1/4Use PT2 and PT3 to constraint the end points4. Create a Sketch.3 on XZ planeDraw an ellipse an trim it to have only less than 1/4Use PT1 and PT3 to constraint the end points5. Create a Sweep surfaceProfile type: ExplicitProfile: Sketch.2Guide curve: Sketch.1Guide curve 2: Sketch.36. Then Symmetry, Join,.... RE: Generating an ELIPSIOD Kapitan (Aerospace) 25 Jun 03 16:39 To create an Ellipsoid, a simple approach is to model it in the unique case where all its semi-axes (a,b,c) are equal, the Sphere, and then stretch it to the dimensions required.So, construct a semi-circle, centred on the origin and lying on one of the principal planes.Probably far easier to do this without using Sketcher, it is not needed. Create the sphere as a surface of revolution, Insert=>Surfaces=>Revolve, and then stretch it along one of its principal axes using Insert=>Operations=>Affinity as required. All this is covered in the Help Documentation, if not familiar with this transformation. The Ellipsoid is a quadric surface so the resultant element of an Affinity Transform on a sphere will be mathematically pure, no sag, distortion or discrepances of tangency and curvature at join boundaries, etc, that can creep in when using less appropriate methods. By doing this all that is in effect happening is that the variables (a,b,c) in the equation of an ellipsoid are being changed. After all, an ellipse is a stretched circle and a circle is an ellipse of identical semi major and minor axes. RE: Generating an ELIPSIOD mickryding (Mechanical) (OP) 25 Jun 03 16:59 Thanks thats solved it.