1. A method of detecting a discontinuity in a computer-generated model comprising: accessing, using a processor, information associated with the model, the information including a feature; accessing, using the processor, a true normal to the feature proximate to a location in the information; comparing, using the processor, an orientation associated with the location to an orientation of the true normal; and indicating, using the processor, the location as being part of a possible discontinuity when the orientation associated with the location is within a preset angular range of the orientation of the true normal.