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rhino:meshdiagnostics [2016/01/20] |
rhino:meshdiagnostics [2020/08/14] (current) |
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+ | ======Mesh Diagnostics====== | ||
+ | // | ||
+ | Sometimes a model can become damaged. These damaged areas can cause problems. | ||
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+ | It is possible to build bad models using Rhino tools - for instance, if you trim a surface with a self-intersecting curve, Rhino will let you do it, but the result will be a poorly defined model that will cause problems later. | ||
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+ | Another problem is having a tiny, trimming edge that then gets joined to a larger trim curve on an adjacent surface. If Rhino matches the large edges, sometimes the tiny trim curve edge can get compressed even further so that it is really just a point. That compressed edge no longer has a meaningful orientation and causes problems. | ||
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+ | There are modeling techniques you can use to increase the overall robustness of your models. | ||
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+ | Sometimes the microscopic edges can be generated through other means, like Booleans where the objects are just off from each other by a little bit. | ||
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+ | Trimming edges that are very small or curved back on themselves are the biggest cause of problems in models. | ||
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+ | There are Rhino tools you can use to examine your model for these defects. | ||
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+ | The first one to try is the **Check** command. If your model doesn' | ||
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+ | If a model passes **Check**, it doesn' | ||
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+ | The workaround is to **Explode**, | ||
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+ | When there are long things and tiny things adjacent to each other, the **Join** command can get confused - when that happens, the low level manual **JoinEdge** can work as a replacement. | ||
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+ | These tools are on the **Analyze** menu under **Edge Tools**. You may need to use several of these tools to fix difficult broken models as well. | ||
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+ | ===Avoiding Modeling Errors=== | ||
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+ | * In general, try to avoid creating tiny edges in models. | ||
+ | * Do not use curves where there is a tiny line in the middle of the curve that joins two pieces together. | ||
+ | * Try to make sure that adjacent parts mate cleanly with a good, simple edge-to-edge matching. | ||
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+ | **You can… ** | ||
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+ | * List data structure of an object --- **List** command | ||
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+ | * Check objects --- **Check** and **CheckMesh** (v4) commands. | ||
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+ | * Select bad objects --- **SelBadObjects** and **ExtractBadSrf** commands |