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rhino:meshfaq [2019/01/23]
mitch_heynick [Other meshing problems and possible solutions]
rhino:meshfaq [2019/01/23] (current)
mitch_heynick [Things to watch out for]
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   * <color darkslateblue>​**Bad objects.**</​color> ​ While they don't always result in mesh problems, these are easy enough to track down, so it's a good place to start. ​ If you find one, try hiding it. If your problem disappears, then perhaps all you need to do is fix the object (make it valid) and you'll be good to go.   * <color darkslateblue>​**Bad objects.**</​color> ​ While they don't always result in mesh problems, these are easy enough to track down, so it's a good place to start. ​ If you find one, try hiding it. If your problem disappears, then perhaps all you need to do is fix the object (make it valid) and you'll be good to go.
  
-  * <color darkslateblue>​**Long,​ skinny surfaces.**</​color> ​ Difficult cases for the mesh engine in V4, this has been vastly ​improved in V5 and no longer pose a problem.+  * <color darkslateblue>​**Long,​ skinny surfaces.**</​color> ​ Difficult cases for the mesh engine in V4, this was improved in V5 and generally ​no longer pose a problem.
  
   * <color darkslateblue>​**Joined tangent lines and arcs that have been extruded or revolved.**</​color> ​ Example: Extruding a rounded rectangle. ​ This forms a single surface with internal G1 areas, which the mesher struggles with.  Solution: **Explode** the curves before extruding, or use **Split ​ > Isocurves** at the G1 spots to create a structure with separate joined tangent surfaces instead of one single one.  In the case of the extruded rounded rectangle, you will have eight joined surfaces, not one.  In V5, you can use the **Extrude** command option **//​SplitAtTangents=Yes//​** to automatically split the resulting extrusion. ​ To fix existing cases, select the object and run the command **DivideAlongCreases > SplitAtTangents=Yes**.   * <color darkslateblue>​**Joined tangent lines and arcs that have been extruded or revolved.**</​color> ​ Example: Extruding a rounded rectangle. ​ This forms a single surface with internal G1 areas, which the mesher struggles with.  Solution: **Explode** the curves before extruding, or use **Split ​ > Isocurves** at the G1 spots to create a structure with separate joined tangent surfaces instead of one single one.  In the case of the extruded rounded rectangle, you will have eight joined surfaces, not one.  In V5, you can use the **Extrude** command option **//​SplitAtTangents=Yes//​** to automatically split the resulting extrusion. ​ To fix existing cases, select the object and run the command **DivideAlongCreases > SplitAtTangents=Yes**.
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   * <color darkslateblue>​**Kinked surfaces.**</​color> ​ Usually caused by having **CreaseSplitting** (native in V5 or V4 add-on) set to No, or using **MergeSrf Smooth=No** on surfaces that are not at least tangent to each other. ​ In this case, again, it is better to have multiple joined surfaces instead of one kinked one.  Use **Surface edit tools > Divide surface along creases** or **Split ​ > Isocurves** at the kinked spots to split these types of surfaces up into separate parts.   * <color darkslateblue>​**Kinked surfaces.**</​color> ​ Usually caused by having **CreaseSplitting** (native in V5 or V4 add-on) set to No, or using **MergeSrf Smooth=No** on surfaces that are not at least tangent to each other. ​ In this case, again, it is better to have multiple joined surfaces instead of one kinked one.  Use **Surface edit tools > Divide surface along creases** or **Split ​ > Isocurves** at the kinked spots to split these types of surfaces up into separate parts.
  
-  * <color darkslateblue>​**Triangular surfaces with holes.**</​color>  ​//This is a known bug in Rhino V4.//  The hole was present in wireframe mode, but invisible in shaded mode. A Custom mode was required to render these surfaces correctly. ​ //​This has been fixed in V5!//+  * <color darkslateblue>​**Triangular surfaces with holes.**</​color> ​ This was a known bug in Rhino V4.  The hole was present in wireframe mode, but invisible in shaded mode. A Custom mode was required to render these surfaces correctly. ​It was fixed in V5.
  
  
rhino/meshfaq.txt ยท Last modified: 2019/01/23 by mitch_heynick