Align curve can be used to make existing curves have common end points, and have the end of the curves have continuity. The continuity options include positional, tangential or curvature continuity.
Use project tangent to create smooth curve transitions where curves meet existing surfaces. Project tangent creates a tangency condition at the point where a curve coincides with the edge of a surface. First select a curve then the isoparm on the adjacent surface that you want the curve to line up with. Project tangent will also line up a curve with two adjacent curves to create a tangency condition. You cannot use project tangent to align a single curve to a single curve. The Align tool, which will be discussed later, will work for this.
|[Figure 12] Patch surfaces created by splitting and rebuilding initial surfaces.|
Separate Initial Surfaces into Patches
The surfaces that you created in the initial surfaces step were only partially ready to be aligned. In order to have a surface network that is ready to create a uniform mesh from, you need to detach the surfaces that were created across the boundaries or adjoining surfaces.
The initial surfaces have to be separated into smaller regions that allow the boundaries of the adjacent surfaces to line up with each other.
When a model made of different patches has uniform meshes, all surfaces have the same number and placement of isoparms as the surfaces next to them. If one surface has four subdivisions that are equally spaced throughout the surface, the adjacent surface has to have four subdivisions that are equally spaced throughout the surface. Figure 12 shows initial surfaces broken into smaller patch surfaces that have common boundaries with the adjacent patches. The surfaces have been rebuilt so all the surfaces have the same number of spans, and the isoparms all align.
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