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- The usefulness and power of the Merge operator can best be explained by following how surfaces can be combined to construct a simple computer "mouse".
- In the figure at the right, a base plane and a vertical curved surface have been combined into a single well defined object with the Merge operator.
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- The third surface is added and merged into the first two surfaces to complete the sides of the mouse. The result is again a well defined object.
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- When the top surface is added and merged into the other surfaces, a volume has been enclosed and a new region has been defined. This information is returned to the program by the Merge operator so that the user can be notified that a solid has been constructed.
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- The next operation easily identifies and removes all the extra surface pieces, the "fins", and so we have built our mouse.
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- One of the common steps required in order to manufacture such parts is to be able to split the part into its upper and lower pieces. So at the right, a splitting surface has been added and the Merge operator divides the mouse into this well defined object. Some applications may want to leave the model in this form.
- Or the splitting surface can be trimmed back to leave the mouse divided into two pieces.
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- Under a non-manifold modeler, it is important to note that the intermediate stages do not have to be a closed solid (as with a manifold solid modeler).
- The NMT representation is necessary in order to merge a surface into a model.
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