First... create these 3 curves (fig 19), or download this step 1 file (Right-Click Save-As), if you open this file you will have 3 curves : 1 straight curve and 3 circle curves (fig 19)
OK first step, select all these curves, then select edit curves > intersect curves, you will have these 6 intersect areas, it means this operation will cut these intersect areas (fig 20). Next select back all of these curves then go to edit curves > cut curves. Now you will see some areas has been removed autmatically (fig 21)
But if you select them one-by-one (individualy), some of these curves are still connected (fig 22). We don't want it, cause for this operation, we need to separate all of the intersected curves. OK now select back all these curves then go to edit curves > cut curves again, this time all of the areas has been cutted out (fig 23), ahhh...OK...this is whats we need to start.
Now select these curves (fig 24), and delete them (fig 25), now you have correct intersected areas, but they're still separated curves, we need to attach all of them right?. You cannot just select all these curves and attach them together.
OK now select these 2 curves (straightcurve first then the circle one) (fig 26), then go to edit curves > attach curves > option box and apply these settings (fig 27), these settings means we'll use connect curve attach method and remove unnecessary multiple knots.
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·Maya建模教程—钻石雕刻
